Service bulletins for the 2021 Freightliner Sprinter
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
87 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| LI54.30-N-079757 | 2025-10-07. Service bulletin. UNKNOWN OR OTHER. Engine Oil Level Cannot Be Checked via Instrument Cluster Service Menu Complaint Sometimes the engine oil level cannot be determined using the instrument cluster's service menu. The following mes- sages may be displayed: •Engine oil level currently inoperative. See Attachment: Message "Engine oil level currently inoperative" (shown in German on model 907 with code C6L (Multifunction steering wheel)). •Engine oil level measurement is running. Repeat the query after a maximum of 30 minutes of driving time. Information: It is still possible to determine the engine oil level via the workshop menu or XENTRY Diagnostics. Cause No current value for the saved oil volume has been stored in the drivetrain control unit (CPC, N127). Remedy 1. Connect diagnostic device (see AD00.00-D-2000-06TS for model 907). •Always use the latest XENTRY Diagnostics software release with all available add-ons. •Follow all operation steps in XENTRY Diagnosis precisely. 2. Perform initial quick test (see AD00.00-D-2000-06TS for model 907). •Print out the initial quick test as a PDF file and attach it to the order in a tamperproof manner. 3. Create and save the control unit log for drivetrain control unit (CPC, N127). •Print out the control unit log as a PDF file and attach it to the order in a tamperproof manner. •Check the saved oil volume in the "Maintenance data" tab of the control unit log. See Attachment: Saved oil volume in "Maintenance data" tab of the control unit log (shown in German). •If the saved oil volume in the "Maintenance data" tab is more than 0.0 liters and it is not possible to determine the en- gine oil level via the service menu, conduct further research on the exact reason for the customer complaint and initia- te corresponding repair measures. •If the saved oil volume is 0.0 liters, proceed with operation step 4. 4. Check actual values for engine oil level in the engine control unit and observe any relevant information and descrip- tions in XENTRY Diagnosis. •Quick test view → Engine control unit → Actual values → Oil circuit → Oil level gauge 5. Clear fault memory (see AD00.00-D-2000-06TS for model 907). 6. Disconnect diagnostic device (see AD00.00-D-2000-06TS for model 907). 7. Carry out a test drive of more than 30 minutes, run the vehicle in idle for approximately 3 minutes on a level sur- face, switch the ignition off and on again, and then record the engine oil level again using the instrument cluster's ser- vice menu. •Only carry this out if the saved oil volume in the "Maintenance data" tab is 0.0 liters. •When checking the engine oil level via the service menu, refer to the operator's manual. Inform the customer accor- dingly about these circumstances. See Attachment: Message "Engine oil level OK" (shown in German on model 907 with code C6L (Multifunction steering wheel)). 8. If the customer complaint occurs again, create a TIPS case directed to the Powertrain inbox, including all required information from this LI. |
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| LI27.19-N-079793 | 2025-10-07. Service bulletin. POWER TRAIN. Complaint Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick test and/or no communication possible with VGS. Cause Transmission control unit Y3/8n4 Remedy For vehicles with 722.9 transmission: Ensure LI54.15-P-057373 is performed before replacing any component parts. After processing and complying with the above document(s): 1. Perform an ignition reset on Y3/8n4 (VGS) 2. Inspect transmission connector for loose connections, damaged wiring or pins and any other concerns. If communication with the VGS cannot be established, the complete valve body ('electrohydraulic controller unit (EHS)') must be replaced. Installation of a VGS repair kit is not permitted in this case as it is not possible to transfer the necessary valve characteristics without communication with the original control unit. |
| LI01.10-N-079275 | 2025-10-07. Service bulletin. ENGINE. Internal Diesel Engine Damage or Oil Sludge Formation Complaint Customer reports that the vehicle will not start, is difficult to start, or is making unusual noises. Inspection Findings: Upon inspection, engine bearings—including crankshaft, connection rod, and camshafts—exhibit significant signs of wear. Engine oil shows evidence of sludging, characterized by the presence of thick, gel-like, or semi-solid deposits within the engine. This condition is indicative of oil degradation and/or contamination. Cause Internal engine wear and starting issues are a result of oil sludging. This sludging occurs due to oil degradation and/or contamination. Common contributing factors include: •Failure to perform maintenance on time as indicated by the ASSYST PLUS system •Use of non-OEM (aftermarket) parts or fluids •Addition of incorrect fluids (e.g., AdBlue, washer fluid, coolant) to the engine oil, which can severely compromise lub- rication and engine operation Important: Under no circumstances should any non-engine fluids—such as AdBlue, washer fluid, or coolant—be ad- ded to the engine oil or crankcase. The introduction of these fluids, even in small amounts, can cause severe engine damage. This damage is not covered under warranty. Always verify that only approved engine oil and additives are used during service. |
| FTL_V-SC-2025070011 | 2025-09-03. Emissions. UNKNOWN OR OTHER. Mercedes-Benz AG, the manufacturer of Freightliner Sprinter vans, has determined that on certain Model Years 2019-2021 Sprinter vehicles, the SCR control unit software does not correspond to the current series production configuration. |
| FTL_V-SC-2025070001 | 2025-09-03. Emissions. UNKNOWN OR OTHER. Mercedes-Benz AG, the manufacturer of Freightliner Sprinter vans, has determined that on certain Model Years 2017-2021 Sprinter vehicles, the In Use Monitor Performance Ratio (“IUMPR”) function of the OBD system might not perform as intended under certain circumstances. |
| LI49.20-N-079593 | 2025-08-01. Service bulletin. UNKNOWN OR OTHER. Check engine light with fault code P20EEFE in the CDI control unit CDI (N3/47) Complaint Check engine light is illuminated with fault code P20EEFE "The efficiency of component 'SCR catalytic converter' is not sufficient" stored in the CDI control unit (N3/47). Cause Excessive ammonia slip is being detected in the SCR system, often triggered by IUMPR (In-Use Monitor Performance Ratio) thresholds. This typically indicates that the SCR catalyst is not converting DEF (AdBlue) efficiently under moni- tored conditions. Common Driving Scenario: •Non-dynamic driving (e.g., highway cruising with cruise control set) •Minimal load changes, steady-state exhaust flow Contributing Factors: •Software influence – IUMPR (In-Use Monitor Performance Ratio) thresholds •DEF Overdosing – Over-injection due to faulty NOx sensors, dosing valve issues, or poor DEF quality •Low Exhaust or Catalyst Temperatures – Common under low-load conditions; reduces SCR conversion efficiency •Catalyst Degradation or Contamination – Aging catalyst or contamination from oil, coolant, or poor-quality DEF Remedy IMPORTANT: Do not replace any components unless instructed through TIPS. For Model Year 2019–2021 Vehicles: •Update the following control units to the latest available software: N3/47 - Motor electronics 'CDI43' for combustion engine 'OM651' (CDI) N118/5 - Selective catalytic reduction (SCR GEN3) •If no newer software is available, proceed with the inspection and documentation steps listed under the No Newer Software section. •Once all inspections are complete, open a TIPS case directed to the Powertrain Inbox, referencing this LI with the collected information and data. No Newer Software Vehicles: Perform the following steps in order. Document all findings with photos and actual values where applicable: 1. Tailpipe Wipe Test •Perform and photograph results. 2. NOx Sensor Harness Inspection •Check connectors, pins, crimps, and harnesses 3. Sensor Plausibility Checks •Record actual values for all pressure and temperature sensors: •Once with the engine cold (≥8 hours off) •Again, at full operating temp, engine idling 4. Smoke Test – Intake, Charge Air, Exhaust •Apply ≤26 psi from the tailpipe. •Seal at clean air line. •Manipulate components during the test. •Document any leaks. 5. DPF Data •Record actual values and regeneration history. 6. SCR Temp Sensor Wiring •Inspect wiring and pins. •Confirm sensor reaches operating temp while driving. •Document time to temp. 7. AdBlue Injector Inspection •Check for clogging or leaks. •Photograph nozzle(s). 8. AdBlue Pressure Test •Remove injector(s), perform 2–3 pressure tests. •Check for leaks and document with photos. 9. DEF Quality Check •Collect a sample. •Note color, clarity, separation, odor, and quantity. •Photograph the fluid and spray pattern. 10. DPF & SCR Visual Inspection •Separate exhaust downstream of DPF. •Inspect for soot, blockage, or damage. •Photograph findings. 11. SCR Catalyst Interior •Inspect for dried AdBlue residue. •Photograph the interior. 12. NOx Sensor Graphing •Perform multiple test drives at varying speeds. •Capture 3–4 graphs/screenshots of NOx sensor signals using XENTRY. •Include one at idle, engine warm. •Disconnect AdBlue valve, drive 30 min, capture 2–3 more graphs. •Once all inspections are complete, open a TIPS case directed to the Powertrain Inbox, referencing this LI with the collected information and data. |
| LI49.20-N-076565 | 2025-08-01. Service bulletin. UNKNOWN OR OTHER. Check engine light with fault code P300E3B in the CDI control unit CDI (N3/28) Complaint Check engine light is illuminated with fault code P300E3B “The efficiency of component 'SCR catalytic converter' is not sufficient" stored in the CDI control unit (N3/28). Cause Excessive ammonia slip is being detected in the SCR system, often triggered by IUMPR (In-Use Monitor Performance Ratio) thresholds. This typically indicates that the SCR catalyst is not converting DEF (AdBlue) efficiently under moni- tored conditions. Common Driving Scenario: •Non-dynamic driving (e.g., highway cruising with cruise control set) •Minimal load changes, steady-state exhaust flow Contributing Factors: •Software influence – IUMPR (In-Use Monitor Performance Ratio) thresholds •DEF Overdosing – Over-injection due to faulty NOx sensors, dosing valve issues, or poor DEF quality •Low Exhaust or Catalyst Temperatures – Common under low-load conditions; reduces SCR conversion efficiency •Catalyst Degradation or Contamination – Aging catalyst or contamination from oil, coolant, or poor-quality DEF Remedy IMPORTANT: Do not replace any components unless instructed through TIPS. For Model Year 2019–2021 Vehicles: •Update the following control units to the latest available software: N3/28 – Motor Electronics 'CDI61NFZ' for combustion engine 'OM642' (CDI): |
| LI49.20-N-079157_6 | 2025-07-01. Service bulletin. ELECTRICAL SYSTEM. Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B. An internal fault with the Adblue Injection Valve #1 (Motor side) C. An air pocket forming in the Adblue Injection Valve #1 (Motor side) Adblue Injector Line Remedy Vehicles Produced Before August 1, 2024 (Code XY4 = MY24) A. Leak in the AdBlue System 1. Complete the Guided Tests for DTC P20F409 or P202E84: •Inspect the AdBlue tank, pump, line, and both injectors for leaks. •Ensure the AdBlue line is properly routed, securely fastened, and not in contact with the exhaust system. •Remove both AdBlue injection valves, perform 2–3 pressure build-ups, and check for AdBlue leaks. •If a leak is detected, repair it and retest. B. Internal Fault with AdBlue Injection Valve #1 (Motor Side) 1. Process All Other Related DTCs First: •Address any other fault codes relating to AdBlue injection valves before proceeding. •If AdBlue Injection Valve #1 (engine side) fails the guided tests, replace it and retest. C. Air Pocket Forming in the AdBlue Line (Motor Side) 1. If Guided Tests Pass and No Leaks are Found: --Do not replace any components.-- •The MY23-24 (Code XY4 = MY24, OM654) AdBlue line (A907 470 01 01) has a known design issue that can cause air pockets and DTC P20F409. This may also result in DTC P202E84, depending on the air pocket size. •The guided tests for P20F409 now include resetting the learned values for the AdBlue delivery pump (A103m1). After this, the vehicle can be released to the customer. NOTE: Replacing the AdBlue tank or line will NOT resolve this air pocket issue. TIPS cases are no longer required for MY23–24 vehicles. Steps to Perform (MY23–24, Code XY4): 1. Complete the guided tests for DTC P20F409 and/or P202E84. 2. Perform an initial start-up of: •The SCR control unit •AdBlue tank components •Both AdBlue injectors 3. Conduct a 20-mile test drive. If no faults occur, the vehicle can be released. 4. Inform the customer that frequent starting/stopping increases the likelihood of this fault due to repeated cycling of AdBlue in/out of the line each ignition cycle. Vehicles Produced After August 1, 2024 (Code XY5 = MY25) A. Leak in the AdBlue System 1. Complete the Guided Tests for DTC P20F409 or P202E84: •Inspect the AdBlue tank, pump, line, and both injectors for leaks. •Ensure the AdBlue line is properly routed, securely fastened, and not in contact with the exhaust system. •Remove both AdBlue injection valves, perform 2–3 pressure build-ups, and check for AdBlue leaks. •If a leak is detected, repair it and retest. B. Internal Fault with AdBlue Injection Valve #1 (Motor Side) 1. Process All Other Related DTCs First: •Address any other fault codes relating to AdBlue injection valves before proceeding. •If AdBlue Injection Valve #1 (engine side) fails the guided tests, replace it and retest. C. Incorrect AdBlue Injection Line Installed 1. Verify the Updated Line is Installed: •Confirm that part number A907 470 33 02 is present. •If the AdBlue line is incorrect (e.g., A907 470 01 01), replace it with the updated line. TIPS Case Instructions for All MY25 and Newer Vehicles If you encounter any of the issues above on any MY25 or newer vehicle, including finding an incorrect AdBlue line in- stalled: •Open a TIPS case addressed to the Powertrain inbox. •Reference this LI document. •Include the following information: •Description of the issue encountered (e.g., fault code, check engine light, or incorrect AdBlue injection line) •Current Quick Test, SCR N118/5 Control Unit Log, and Guided Test results. •Photo of AdBlue line part number label. •Photos documenting any issues, leaks, or melting observed |
| LI47.70-N-079422_1 | 2025-07-01. Service bulletin. ELECTRICAL SYSTEM. HV battery is not charging to its full capacity with restricted maximum SoC Complaint The vehicle's HV battery is not charging to its full capacity, with the maximum State of Charge (SoC) being restricted to a specific percentage. Cause The State of Charge (SoC) percentage limitation might be influenced by the Onboard Logic Unit (OLU), MBUX Headunit, or the Powertrain Control Unit (PTCU). Remedy If the Onboard Logic Unit (OLU) and MBUX Headunit do not impose a SoC percentage limitation, then proceed with the SCN coding of the Powertrain Control Unit (PTCU). |
| LI14.30-N-075882_6 | 2025-07-01. Service bulletin. ENGINE. Check engine light active - Fault P3007F1, P3007F2, P300CA8, or P300CA9 present in CDI control unit Complaint Check engine warning light active. The following fault codes may be present in the engine control unit: • P3007F1 Leak detected in intake air system or • P3007F2 Mass air flow malfunction in intake air system (cylinder bank 1) or • P300CA8 Leak detected in intake air system or • P300CA9 Mass air flow malfunction in intake air system (cylinder bank 1) or • P300CA9 and P3007F1: Faults are present simultaneously in the quick test Cause Causes for FC P3007F1 or P300CA8: Faults are set if: • If there is a leakage upstream of the exhaust gas turbocharger (see "Dichtring_Sealant.jpg"). • If the housing intermediate flange at the high-pressure EGR valve (where the exhaust back pressure sensor connects) is carbonized or clogged, or if there is carbonization/incomplete sealing of the high-pressure or low- pressure EGR valves. (See “Gehaeusezwischenflansch_intermediate_flange.jpg” and “verstopfter_Gehaeuse- zwischenflansch_clogged_Intermediate_Flange.jpg.”) • Note: Only relevant if correction value in load range 1 is less than -8%. • If the intake manifold (charge air distribution line) or charge air cooler is carbonized (see "Saugrohr_intake_mani- fold.jpg"). • If engine timing is misadjusted. • There is a defective hot film mass air flow sensor or a hot film mass air flow sensor that is affected by incorrect airflow (this can be due to a clogged or deformed air filter). Refer to the attached file "Luftfilter_air_filter." Cause for FC P3007F2 or P300CA9: Faults are set if: • There is a leak downstream of the exhaust gas turbocharger. • The charge air distribution line (intake manifold) is heavily carbonized (see "Saugrohr_intake_manifold.jpg"). • There is carbonization or incomplete closure of the high-pressure exhaust gas recirculation valve, especially in the housing intermediate flange at the EGR valve (linked to the exhaust back pressure sensor). • There is a defective hot film mass air flow sensor, or it is affected by incorrect airflow due to a clogged or defor- med air filter (see "Luftfilter_air_filter"). Cause of fault code combination P300CA9 AND P3007F1: Faults are set if: • There is carbonization or incomplete closure of the high-pressure exhaust gas recirculation valve, especially in the housing intermediate flange at the EGR valve (linked to the exhaust back pressure sensor). Charleston Plant Identification – VIN 11th Digit “T”: For vehicles produced at the Charleston Plant (identified by “T” in the 11th digit of the VIN) with a production date on or after 12/20/2023: • If fault code P3007F1 or P300CA8 is set and the cause is identified as a loose or mis-installed Clean Air Line from the factory, open an Initial Field Quality (Info Only) case. • Include the current Quick Test and photos showing the Clean Air Line issue. For all other vehicles, continue diagnosis as per the standard instructions. Remedy In the case of fault code P3007F1 or P300CA8: 1) Check for Required ECU Software Update (Applies to P300CA8 only) |
| LI14.20-N-079253_3 | 2025-07-01. Service bulletin. ENGINE. Check engine light with fault code P300E55 with H12 Complaint The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation cooler (low pressure): •P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient. Cause The issue is attributed to an error in the coding of the climate control unit software (HVAC177). Remedy Software Update Instructions Please proceed as follows for the different variants: |
| LI01.10-N-079275_1 | 2025-07-01. Service bulletin. ENGINE. Internal Diesel Engine Damage or Oil Sludge Formation Complaint Customer reports that the vehicle will not start, is difficult to start, or is making unusual noises. Inspection Findings: Upon inspection, engine bearings—including crankshaft, connection rod, and camshafts—exhibit significant signs of wear. Engine oil shows evidence of sludging, characterized by the presence of thick, gel-like, or semi-solid deposits within the engine. This condition is indicative of oil degradation and/or contamination. Cause Internal engine wear and starting issues are a result of oil sludging. This sludging occurs due to oil degradation and/or contamination. Common contributing factors include: •Failure to perform maintenance on time as indicated by the ASSYST PLUS system •Use of non-OEM (aftermarket) parts or fluids •Addition of incorrect fluids (e.g., AdBlue, washer fluid, coolant) to the engine oil, which can severely compromise lub- rication and engine operation Important: Under no circumstances should any non-engine fluids—such as AdBlue, washer fluid, or coolant—be ad- ded to the engine oil or crankcase. The introduction of these fluids, even in small amounts, can cause severe engine damage. This damage is not covered under warranty. Always verify that only approved engine oil and additives are used during service. Remedy To thoroughly diagnose internal engine wear or oil sludging, follow these guidelines: Maintenance History •Verify maintenance intervals: Check that all maintenance has been performed on schedule as indicated by the ASSYST PLUS system in the Instrument Cluster and according to WIS. (Refer to Attachments) •Review records: Examine the vehicle’s service history using resources like VMI, CarFax, and any documentation pro- vided by the customer. •Validate parts and fluids: Confirm all maintenance was carried out using OEM-approved parts and fluids as specified in the Owner’s Manual and Maintenance Booklet. |
| LI49.20-N-079157 | 2025-06-03. Service bulletin. ENGINE. Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B. An internal fault with the Adblue Injection Valve #1 (Motor side) C. An air pocket forming in the Adblue Injection Valve #1 (Motor side) Adblue Injector Line Remedy --Prior To Production Date 08/01/2024 Code XY4 = MY24-- A. A Leak in the Adblue System 1. Complete the Guided Tests for P20F409 or P202E84: •Perform a thorough inspection of the Adblue Tank, the Adblue Pump, the Adblue Line, and both Adblue Injectors for leaks. •Ensure the Adblue line is properly installed, securely fastened in all clips, and not in contact with the exhaust system. •Remove both Adblue Injection Valves and complete 2-3 pressure build-ups and inspect for Adblue leakage. •If a leak is identified, repair it and retest. B. An internal fault with the Adblue Injection Valve #1 (Motor side) 1. Process Other Fault Codes First: •If there are other fault codes for the Adblue Injection Valves, address these first. •If the Adblue Injection Valve #1 (engine side) fails the guided tests, replace it and retest. C. An air pocket forming in the AdBlue Line (Motor side) 1. If Guided Tests Pass and No Leaks are Found: •Do not replace any components. •Germany has identified the root cause of fault code P20F409 and is working on a solution. The design of the MY23-24, Code XY4 = MY24, OM654 AdBlue Line (A907 470 01 01) is causing air pockets in the system, resulting in fault code P20F409. Depending on the size of the air pocket, you may also encounter fault code P202E84 AdBlue Metering Valve 1 (Motor side). •The guided tests for fault code P20F409 have been updated to include the resetting of learned values for component ‘A103m1 (AdBlue delivery pump)’ and to release the vehicle back to the client. |
| LI14.20-N-079253 | 2025-06-03. Service bulletin. ENGINE. Complaint The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation cooler (low pressure): •P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient. Cause The issue is attributed to an error in the coding of the climate control unit software (HVAC177). Remedy A software update to correct the coding error is currently in the process of release for the Aftersales network. In the interim, please proceed as follows: •Erase the fault memory (DTCs) from the control unit. •Return the vehicle to the customer. •No further diagnostic or repair procedures are required at this time. |
| LI14.20-N-073867 | 2025-06-03. Service bulletin. ENGINE. Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes PDF document in attachments. Complaint C: One or more electrical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of electrical fault codes PDF document attached. Cause Cause of Complaint A: Increased friction between the EGR Valve blade and seat due to soot deposits causing a delay of the EGR Valve being able to reach the target value of the EGR Valve position controller. NOTE: This causes the EGR Valve blade and potentially the boost pressure controller to oscillate. Cause of Complaint B: Soot deposits between the EGR Valve blade and seat leading to the EGR Valve no longer being able to meet the desired target of the EGR Valve position controller. Cause of Complaint C: Internal EGR Valve or other electrical faults related to the EGR Valve function. |
| EGR Valve | 2025-05-02. Warranty extension. ENGINE. In our continuing efforts to assure the proper performance of our products and to ensure the satisfaction of our customers, the warranty for the EGR Valve in the vehicles listed below has been extended from the original 5 years/100,000 miles to 15 years/150,000 miles, whichever occurs first. Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz Sprinter vehicles, has determined that dimensional variations during engine valve seating may cause the exhaust gas recirculation (“EGR”) valve to be switched-off and the vehicle may experience a loss of power and enter a limp home mode. The MIL will illuminate and remain illuminated until the vehicle is serviced. When this occurs, the driver may perceive a jerky driving experience while operating the vehicle. An authorized Mercedes-Benz Sprinter dealer will clean and/or replace the EGR valve free of charge for the customer. |
| LI49.20-N-079157 | 2025-05-02. Service bulletin. ENGINE. Check engine light with possible Adblue warning with fault code P20F409 or P202E84 Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B. An internal fault with the Adblue Injection Valve #1 (Motor side) C. An air pocket forming in the Adblue Injection Valve #1 (Motor side) Adblue Injector Line Remedy --Prior To Production Date 08/01/2024-- A. A Leak in the Adblue System 1. Complete the Guided Tests for P20F409 or P202E84: •Perform a thorough inspection of the Adblue Tank, the Adblue Pump, the Adblue Line, and both Adblue Injectors for leaks. •Ensure the Adblue line is properly installed, securely fastened in all clips, and not in contact with the exhaust system. •Remove both Adblue Injection Valves and complete 2-3 pressure build-ups and inspect for Adblue leakage. •If a leak is identified, repair it and retest. |
| LI14.20-N-073867 | 2025-05-02. Service bulletin. ENGINE. EGR Valve Diagnosis and Cleaning Procedure using TUNAP 926® on 906, 907 Sprinter with OM642 Diesel Engine Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes PDF document in attachments. Complaint C: One or more electrical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of electrical fault codes PDF document attached. NOTE: This LI supersedes LI14.20-N-073813, which is no longer valid. Cause Cause of Complaint A: Increased friction between the EGR Valve blade and seat due to soot deposits causing a delay of the EGR Valve being able to reach the target value of the EGR Valve position controller. NOTE: This causes the EGR Valve blade and potentially the boost pressure controller to oscillate. Cause of Complaint B: Soot deposits between the EGR Valve blade and seat leading to the EGR Valve no longer being able to meet the de- sired target of the EGR Valve position controller. Cause of Complaint C: Internal EGR Valve or other electrical faults related to the EGR Valve function. |
| LI09.41-N-079165_1 | 2025-05-02. Service bulletin. ENGINE. Low Coolant Warning, Potential Misfire, and Absence of External Coolant Leaks Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of the following possible fault codes related to the coolant system: P30040B: Component 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to po- sitive. P25567B: Sensor 'Coolant level' has a malfunction. The fluid level is too low. Cause The potential causes for this topic are: A. A leak in the Coolant System, other than the Charge Air Cooler. B. An Internal leak of the Charge Air Cooler. C. An unapproved/aftermarket upfit or modification to the coolant system. Remedy A. A leak in the Coolant System, other than the Charge Air Cooler 1. Complete a coolant system pressure test: •Refer to WIS Doc AR20.00-D-1011TS - Check engine cooling system for leak tightness. •Use Tester Cap 210 589 00 91 and Pressure Pump 124 589 24 21 00. •Apply test pressure to the engine cooling system. Do not exceed the specified test pressure of 1.5 Bar to prevent da- mage to the engine cooling system. •Perform a visual check on the top and bottom of the engine compartment and in the vehicle interior. •If coolant loss or pressure loss is present, perform suitable repair measures depending on the vehicle equipment. •If NO signs of coolant loss are found but pressure loss is present, proceed to Step B. |
| LI09.40-N-079144_4 | 2025-05-02. Service bulletin. ENGINE. Check engine light with reduced power with fault codes P300A6D, P300974, P300DFB, or P300DE8 Complaint: The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: • P300A6D The boost pressure is too low. Charge Air Cooler. • P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low. • P300DFB Component 'Boost pressure positioner' has a malfunction. • P300DE8 Boost pressure control A has a malfunction after the cold start. Cause: The potential causes for these fault codes are: A. Leak or Blockage in the Intake or Charge Air System: This can prevent the proper flow of air, affecting the boost pressure. B. Insufficient Source Vacuum, Vacuum Leak, or Sticking/Weak Vacuum Component: These issues can prevent the boost pressure positioner from functioning correctly. C. Internal Malfunction of the Boost Pressure Positioner: The component itself may be faulty. D. Internal Defect with the Variable Turbine Geometry (VTG) System inside the Turbocharger: Issues within the turbo-charger can affect boost pressure control. |
| LI01.20-N-079115_1 | 2025-05-02. Service bulletin. ENGINE. Check engine light illuminated - Fault code current P04D-B79 The crankcase ventilation system is interrupted. Complaint: Check engine light on. Fault code P04DB79 is current in the engine control module (N3/10). Cause: Open circuit or high resistance to crankcase vent line contact Remedy 1. Check the electrical connector for S208 vent line contact switch. Refer to attached photo of connection location. 2. Ensure the bolted connection is secure and bolt can be torqued (9Nm). 3. Check continuity from vent line connection to ME control unit. Repair wire if damage is found. |
| LI82.35-N-078930 | 2025-04-03. Service bulletin. VISIBILITY/WIPER. Warning Lamp "Washer Fluid Empty" Yet Reservoir Is Not Empty Complaint: Warning lamp "washer fluid empty", even thought the washer fluid reservoir is full Cause: Insufficient electrical conductivity of the washer fluid, as the washer fluid was mixed with distilled water. Tip: The washer fluid sensor detects the electrical conductivity. If air is present without electrical conductivity between the measuring points, as is the case with an empty tank, an empty tank is detected by the sensor. Distilled water also does not have electrical conductivity, meaning that the sensor detects an empty tank, even if this is not the case. Remedy: Fill reservoir with standard washer fluid and water (no distilled water) in an adequate ratio in order to ensure electrical conductivity. Exchange of the reservoir with a welded-in sensor is only required if filling with conductive washer fluid has not provi- ded a remedy. This can be made certain by utilizing water with a light amount of salt dissolved in to it for stronger con- ductivity. |
| LI49.20-N-078838 | 2025-04-03. Service bulletin. FUEL/PROPULSION SYSTEM. Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 when outside temperatures are below 32 degrees Fahrenheit. SCR Gen4 (KP7) Complaint: The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes rela- ted to the AdBlue tank: P206B31: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of the AdBlue fill level sensor; the signal is absent. P300494: The quality of the AdBlue is insufficient. Cause: A. The software for the AdBlue (SCR) control unit (N118/5) is outdated. B. The concentration of AdBlue is either above or below the Mercedes-Benz specifications, which can lead to prema- ture freezing. C. Frozen or partially frozen AdBlue can cause the AdBlue level sensor to misread levels. D. The AdBlue level sensor is damaged. |
| LI49.20-N-075995 | 2025-04-03. Service bulletin. ENGINE. Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint: Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset. Information: All fault codes in the AdBlue® (SCR) control unit have been processed and corrected; however, fault codes P13DF00 and P300685 remain active and stored in the AdBlue® (SCR) control unit. Cause: The procedure for resetting the SCR/AdBlue® warning message with XENTRY Diagnosis has not been carried out. Information: Before resetting the SCR/AdBlue® warning message for SCR Generation 4, the AdBlue® system must be in proper working condition and tested. |
| LI47.10-N-079010 | 2025-04-03. Service bulletin. FUEL/PROPULSION SYSTEM. Procedure for When Diesel Fuel Tank is Filled with Incorrect Fuel Type Complaint: Procedure for When Diesel Fuel Tank is Filled with Incorrect Fuel Type (e.g., gasoline, water, biodiesel, AdBlue/DEF) Cause: The incorrect fuel type, such as gasoline, water, biodiesel, or AdBlue/DEF has been added to the fuel system. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.