# Service bulletin LI49.10\-P\-080201 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: 11028531 - Published by NHTSA: 2026\-02\-06 - Manufacturer's number: LI49.10\-P\-080201 - Manufacturer's date: 2026\-02\-03 - NHTSA component: ENGINE ## NHTSA's summary Complaint Check engine light illuminate, or previously on One of the below Exhaust Flap fault codes stored in PTCU N127: P13C273 P13C278 P140473 Cause Various Remedy Model year 2024 254 and 167 with engine M254 \-Update software of N127 PTCU. New software: 254\- A2549022611 167\- A2549022811 \-Clear fault codes and check operation of the exhaust flap. Models with M256, or models with M254 after SW update \-Check exhaust flap for free movement via actuation. \-Remove flap actuator and check movement of flap in exhaust pipe. Replace exhaust pipe section if flap is binding. \-Replace flap actuator if above checks are ok. If fault code returns after performing the above steps, open a TIPS case with the powertrain team. Note: Codes P13C273 and P13C278\- Right side flap Code P140473\- Left side flap ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028531-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028531-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Engine ## Trouble codes named P13C2, P1404 ## Vehicles listed - 2024 MERCEDES\-BENZ AMG CLE53 - 2024 to 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+ - 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+ CABRIOLET - 2025 MERCEDES\-BENZ AMG E 53 4MATIC\+ WAGON - 2024 MERCEDES\-BENZ AMG GLC43 - 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC - 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE - 2024 to 2025 MERCEDES\-BENZ AMG GLC63 S E - 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ - 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ COUPE - 2024 to 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+ - 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+ COUPE - 2024 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+ - 2025 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+ COUPE - 2024 MERCEDES\-BENZ CLE 300 - 2024 to 2025 MERCEDES\-BENZ CLE 300 4MATIC - 2024 to 2025 MERCEDES\-BENZ CLE 300 4MATIC CABRIOLET - 2024 MERCEDES\-BENZ CLE 450 - 2024 to 2025 MERCEDES\-BENZ CLE 450 4MATIC - 2024 to 2025 MERCEDES\-BENZ CLE 450 4MATIC CABRIOLET - 2024 to 2025 MERCEDES\-BENZ E 350 - 2024 to 2025 MERCEDES\-BENZ E 350 4MATIC - 2024 MERCEDES\-BENZ E 450 - 2024 to 2025 MERCEDES\-BENZ E 450 4MATIC - 2024 to 2025 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN - 2025 MERCEDES\-BENZ E53 E 4MATIC\+ - 2024 to 2025 MERCEDES\-BENZ GLC 300 - 2024 to 2025 MERCEDES\-BENZ GLC 300 4MATIC - 2024 to 2025 MERCEDES\-BENZ GLC 300 4MATIC COUPE - 2025 MERCEDES\-BENZ GLC 350 E 4MATIC - 2024 MERCEDES\-BENZ GLE 350 - 2024 to 2025 MERCEDES\-BENZ GLE 350 4MATIC - 2024 MERCEDES\-BENZ GLE 450 - 2025 MERCEDES\-BENZ GLE 450 4MATIC - 2025 MERCEDES\-BENZ GLE 450 4MATIC COUPE - 2024 to 2025 MERCEDES\-BENZ GLE 450E 4MATIC - 2024 to 2025 MERCEDES\-BENZ GLE 580 4MATIC ## Other bulletins for the same vehicles and component - [PSL\-NCU Return Parts 8/14](/bulletins/11036345.md), 2026-08-26, Other: ENGINE; SUSPENSION. 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, September 3rd, 2026. After September 3rd, 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. - [NCU\-2025040013](/bulletins/11018627.md), 2025-05-29, Service campaign: ENGINE. Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has determined that on certain subject vehicles, the ME\-SFI control unit software does not meet current production specifications. As a result, a check engine malfunction indicator lamp might erroneously be triggered. - [LI07.70\-P\-078520](/bulletins/11015543.md), 2025-03-11, Service bulletin: ENGINE. Complaint Check engine light on. Engine in limp\-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire\- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation\- P217800 P218762, P017100, P017200, P217700 Injector malfunction\- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy \-Check engine control unit N3/10 for software update. \-Proceed with software update if new software version 2549032303, 2549032403, 2549032503 or 2549032603 are found. \-Clear faults and check for any symptoms on road test \*\*Do not replace hardware unless clear part malfunction is determined\*\* - [LI18.10\-P\-078867](/bulletins/11014684.md), 2025-03-03, Service bulletin: ENGINE. Complaint Red oil pressure warning in instrument cluster One of the below fault codes is stored in powertrain control unit N127: P052497 The oil pressure is too low. The system function is restricted. P052400 The oil pressure is too low Cause Various Remedy If low oil level warning present diagnose cause of this first. \-Check engine oil level and correct if necessary. Refer to vehicle specific instructions AP18.00\-P\-1848U \-Check for external engine oil leaks \-Measure engine oil pressure via graphical representation in MRG actual values. In one measurement capture the pressure at idle, 1000, 2000, and 3000 rpm. Hold each range for approx. 5 seconds. \-Save results as CSV file \-Create TIPS case and submit to the powertrain team, including • Oil pressure test results CSV file • Initial quick test • Any additional test results or observations • Any previous diagnosis or repairs performed JSON: [/v1/bulletins/11028531](/v1/bulletins/11028531) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20LI49.10-P-080201&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11028531&vehicle=Service%20bulletin%20LI49.10-P-080201)