Service bulletin LI01.20-P-080884
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 11036229 |
| Published by NHTSA | 2026-08-18 |
| Manufacturer's number | LI01.20-P-080884 |
| Manufacturer's date | 2026-08-12 |
| NHTSA component | ENGINE |
NHTSA's summary
Complaint Oil leaks found on M176 or M177 engines diagnosed to be from the cylinder head cover area Cause Unknown (under investigation) Remedy If oil leaks are found at left or right cylinder head cover area please collect the following information and open TIPS case. 1. Collect photos of the leak 2. Include close up and wide view photos to accurately represent the location 3. Include if the vehicle has a "check oil level" Light on in the cluster or fault codes 4. Check oil level as per WIS to verify level and calculate possible oil loss from the leak 5. Identify and communicate the severity of the leak and provide supporting documentation 6. Open a TIPS case with the above information and submit to the Powertrain team for processing
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Engine
| MERCEDES BENZ AMG GLE63 S 4MATIC+ | 2025 |
|---|---|
| MERCEDES BENZ AMG GLS63 4MATIC | 2026 |
| MERCEDES BENZ AMG GLS63 4MATIC+ | 2026 |
| MERCEDES BENZ AMG GLS63 4MATIC+ COUPE | 2026 |
| MERCEDES BENZ GLE 580 4MATIC | 2026 |
| MERCEDES BENZ GLS 580 4MATIC | 2026 |
| MERCEDES-BENZ AMG C63 | 2015 to 2021 |
| MERCEDES-BENZ AMG C63 S | 2019 to 2023 |
| MERCEDES-BENZ AMG C63S | 2015 to 2018 |
| MERCEDES-BENZ AMG E63 | 2018 |
| MERCEDES-BENZ AMG E63 S | 2023 |
| MERCEDES-BENZ AMG E63S | 2018 to 2022 |
| MERCEDES-BENZ AMG G63 | 2019 to 2024 |
| MERCEDES-BENZ AMG GLC63 | 2018 to 2022 |
| MERCEDES-BENZ AMG GLC63 S | 2020 to 2023 |
| MERCEDES-BENZ AMG GLC63S | 2018 to 2019 |
| MERCEDES-BENZ AMG GLE63 S | 2021 to 2022 |
| MERCEDES-BENZ AMG GLE63 S 4MATIC+ | 2023 to 2024 |
| MERCEDES-BENZ AMG GLE63 S 4MATIC+ COUPE | 2023 to 2025 |
| MERCEDES-BENZ AMG GLE63 S COUPE | 2021 to 2022 |
| MERCEDES-BENZ AMG GLS63 | 2020 to 2022 |
| MERCEDES-BENZ AMG GLS63 | 2026 |
| MERCEDES-BENZ AMG GLS63 4MATIC+ | 2023 to 2025 |
| MERCEDES-BENZ AMG GT 63 S E COUPE | 2023 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT55 4MATIC+ | 2026 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 | 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 4MATIC+ | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 PRO 4MATIC+ | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S | 2022, 2023 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S E | 2024, 2025 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S E PERFORMANCE | 2024 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S E PERFORMANCE 4MATIC+ | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63S | 2019, 2020, 2021 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG S 63 E 4MATIC+ | 2023 to 2026 |
| MERCEDES-BENZ AMG S63 | 2017 to 2021 |
| MERCEDES-BENZ AMG SL55 4MATIC+ | 2026 |
| MERCEDES-BENZ AMG SL63 | 2022 to 2023 |
| MERCEDES-BENZ AMG SL63 | 2025 |
| MERCEDES-BENZ AMG SL63 4MATIC+ | 2023 to 2026 |
| MERCEDES-BENZ AMG SL63 S E | 2024 to 2025 |
| MERCEDES-BENZ AMG SL63 S E PERFORMANCE 4MATIC+ | 2024 to 2026 |
| MERCEDES-BENZ G 550 | 2019 to 2024 |
| MERCEDES-BENZ G550 | 2016 to 2018 |
| MERCEDES-BENZ GLE 580 | 2020 to 2021 |
| MERCEDES-BENZ GLE 580 4MATIC | 2021 to 2025 |
| MERCEDES-BENZ GLE 580 4MATIC COUPE | 2021 to 2022 |
| MERCEDES-BENZ GLS 580 4MATIC | 2020 |
| MERCEDES-BENZ GLS 580 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ GLS 600 | 2023 |
| MERCEDES-BENZ GLS580 | 2021 |
| MERCEDES-BENZ S 560 | 2021 |
| MERCEDES-BENZ S 560 4MATIC | 2018 to 2020 |
| MERCEDES-BENZ S 560 4MATIC COUPE | 2018 to 2020 |
| MERCEDES-BENZ S 580 | 2021 |
| MERCEDES-BENZ S 580 | 2023 |
| MERCEDES-BENZ S 580 4MATIC | 2022 to 2026 |
| MERCEDES-MAYBACH GLS 600 | 2021 |
| MERCEDES-MAYBACH GLS 600 4MATIC | 2022 to 2026 |
| MERCEDES-MAYBACH S 560 | 2021 |
| MERCEDES-MAYBACH S 560 4MATIC | 2018 to 2020 |
| MERCEDES-MAYBACH S 580 | 2021 |
| MERCEDES-MAYBACH S 580 4MATIC | 2022 to 2026 |
| MERCEDES-MAYBACH SL 680 4MATIC+ | 2026 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 20V048000 | 2020-01-27. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER |
|---|---|
| 2020026 | 2020-01-24. Engine |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| LI18.00-P-073137 | 2026-10-06. Service bulletin. Complaint Sporadic warning message in instrument cluster "Engine oil pressure, stop switch off vehicle" (or similar) is shown in red on vehicles with low mileage. Cause Directional control valve may stick. Remedy 1‑ Read off oil level in instrument cluster and correct if necessary. 2‑ Perform approx. 10‑15 engine starts, then clear fault codes. 3‑ Perform road test with vehicle. If fault code reoccurs during road test: Install new directional control valve. |
|---|---|
| LI20.10-P-075374 | 2026-10-06. Service bulletin. Complaint Red coolant warning in instrument cluster. Fault codes U019F00 or U019F87 current/stored in MRG1 control unit. Cause Various causes Remedy Perform guided test for fault code U019F with XENTRY diagnosis. Verify the following connections are clean and tight. Correct any problems and retest pump actuation: ‑12V plug at M75/11 ‑48V plug at M75/11 ‑48V connector X192/4 ‑Connections at 48V fuse box F153/2 ‑Sockets 1,2, and 5 at connector 2 of MRG1 control unit ‑M75/11 circuit 41 ground If actuation and above connections are OK, but resistance between M75/11 and engine block is less than 2 ohms or heat shield touching coolant pump, proceed with below steps. 1‑Modify engine insulation per attached instructions. 2‑Remove engine control module and measure continuity within control unit between connector 2 pin 1 and connector 6 pin 2. 2a‑If open circuit is found, replace engine control unit (MRG1) and perform initial startup. Refer to XENTRY parts information group 54/054 item 300. 3‑Clear faults and verify M75/11 operating normally. |
| LI07.10-P-080384 | 2026-08-10. Service bulletin. Complaint Customer reports Check Engine Light with possible loss of power concern. The Following DTC's are present • P210185 - The throttle valve actuator has a malfunction. There is a signal above the permissible limit value. • P213500 - The values from the position sensors of the throttle valve are implausible relative to each other • P213600 - The values from position sensors "A/C" of the throttle valve are implausible relative to each other • P210B85 - The throttle valve actuator 2 has a malfunction. There is a signal above the permissible limit value. • P2AD300 - The values from the position sensors "A/G" of the throttle valve are implausible relative to each other • P2AD200 - The values from position sensors "B/G" of the throttle valve are implausible relative to each other. Cause Increased electrical resistance in pins for left and right throttle actuators. (M16/60 and M16/61) Remedy Replaced left and right throttle actuator Sockets with updated part. Silver Coated Pins 8x A 003 982 70 26 (according to wiring diagram 0,5mm) Gold Coated Pins 4x A 003 982 75 26 (according to wiring diagram 0,75mm) ELA Seals 12x A 001 545 50 80 |
| Emissions - 2024100016 | 2026-07-27. Emissions. Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz, has determined that on certain MY 2019-2021 C-Class, G-Class, GLC, GT, S-Class (205, 463, 253, 190 & 222 platforms) vehicles, the engine control unit software does not correspond to current production specifications. It is therefore possible that on-board diagnostics and/or exhaust gas emissions requirements may not be fulfilled. |
| LI20.10-P-072886 | 2026-07-27. Service bulletin. Complaint Check Engine Light ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and/or stored in the ME (N3/10). There are no drivability concerns related to this complaint. Cause Root cause varies Remedy Prior to performing any repairs for this complaint: With a cold engine, pressurize the high temp coolant circuit and while it's under pressure, release the cap on the low temp coolant circuit and check if the pressure drops right away or not. If the pressure drops, the lower coolant hoses are swapped. Correct this, fill, bleed and test drive the vehicle. If the complaint returns, then continue with the steps below. IMPORTANT: Use VMI to check for the following emission extended warranty –> Engine Thermostat (incl. software update) MY19-23, Various Models and Platforms (167, 190, 205, 213, 217, 222, 223, 232, 253, 290, 463) If the vehicle is covered under the above emission extended warranty, please perform steps outlined in the accompanying NCU prior to those outlined in this document. If vehicle is not covered under the above emission extended warranty or the complaint continues to occur, then proceed as follows: Check for available software updates to the ME (N3/10). If updated software is available, perform the update, clear the DTC and the perform each of the "WARM START" and "COLD START" test drives listed below twice. If the code does not re-appear then release the vehicle. If there is no new software available OR the DTC returns after the test drives then perform the following steps: • Drain the coolant through a fine mesh sieve and check for signs of debris. Additionally, inspect the coolant reservoir for debris. If any debris is found take pictures of the reservoir and the mesh filter and "flush" the system at least 2-3 times to clear as much of the debris as possible • Replace the thermostat and bleed the system as outlined in AR20.00-P-1142-04A, evacuate the system for 20-30 minutes instead of the 5 minutes specified in step 22 • NOTE: Please use all the tools specified in the AR document. The DTC will continue to populate if the circuit is not properly bled • NOTE: There are two valid thermostats to choose from in the parts section of this LI. Please verify which PN is applicable for the vehicle being worked on via XENTRY Parts Information • After bleeding the system clear the DTC and perform each of the "WARM START" and "COLD START" test drives listed below twice. If the DTC does not reappear after the tests, release the vehicle If the ME (N3/10) software is up to date, the thermostat has already been replaced, and the complaint persists open a TIPS case and attach the following documents: • Initial quick test • ME (N3/10) control unit log • The results of an R48 test from a “yes” response and from a “no” response • Pictures of the coolant reservoir and mesh sieve (mentioned above) WARM START · Begin with the engine coolant temperature at approximately 50 degrees C · Activate the AC system, if defrost is not in use open the windows · Drive the car normally until a coolant temperature of 75 degrees C is achieved · Depress the accelerator pedal 50% for ~5 seconds (partial acceleration) · Let off the accelerator pedal and let the car coast for ~10 seconds · Continue to drive the car normally COLD START · Drive for ~7 miles (normal driving) · Shut off the engine in a parking lot (or similar), wait 30 seconds, then restart and continue driving · Depress the accelerator pedal 50% for ~5 seconds (partial acceleration) · Let off the accelerator pedal and let the car coast for ~10 seconds · Continue to drive the car normally |
| LI54.21-P-080326 | 2026-07-06. Service bulletin. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167: SW has been released. Update the FSAM to the latest SW version. 465, 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer. |
| PSL-NCU Return Parts 6/19 | 2026-06-25. Other. Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than Thursday, July 9, 2026. After July 9th, returns of these parts will no longer be accepted. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. All returned parts will be replaced in accordance with the chart provided below. |
| LI54.21-P-080326 | 2026-06-22. Service bulletin. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167: SW has been released. Update the FSAM to the latest SW version. 465, 290: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer. |
| LI07.10-P-080384 | 2026-05-20. Service bulletin. Complaint Customer reports Check Engine Light with possible loss of power concern. The Following DTC's are present • P210185 - The throttle valve actuator has a malfunction. There is a signal above the permissible limit value. • P213500 - The values from the position sensors of the throttle valve are implausible relative to each other • P213600 - The values from position sensors "A/C" of the throttle valve are implausible relative to each other • P210B85 - The throttle valve actuator 2 has a malfunction. There is a signal above the permissible limit value. • P2AD300 - The values from the position sensors "A/G" of the throttle valve are implausible relative to each other Cause Increased electrical resistance in pins for left and right throttle actuators. (M16/60 and M16/61) Remedy Replaced left and right throttle actuator Sockets with updated part. Silver Coated Pins 8x A 003 982 70 26 (according to wiring diagram 0,5mm) Gold Coated Pins 4x A 003 982 75 26 (according to wiring diagram 0,75mm) ELA Seals 12x A 001 545 50 80 |
| CL-Ignition Coil | 2026-04-30. Other. In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA (“MBUSA”) is extending the coverage for the ignition coil on your vehicle from the original New Vehicle Limited Warranty of 4 years / 50,000 miles to 15 years / 150,000 miles (whichever occurs first),and applies to the vehicle regardless of ownership. Why the warranty extension? On certain Model Year vehicles, the ignition coil might not operate and meet specifications as intended, potentially illuminating the check engine Malfunction Indicator Lamp (‘MIL’). Any repairs under this warranty extension must be performed by an authorized Mercedes-Benz dealership. • If your preferred authorized Mercedes-Benz dealership performs a diagnosis and confirms that your vehicle has the issue, the repair will be performed at no cost to you. • This extended warranty does not apply to any other components or conditions beyond the ones mentioned above, and standard warranty terms apply, including the exclusions with respect to extra expenses, as identified in the Service and Warranty Information booklet. |