2024 Mercedes-Benz GLE 450E 4MATIC

2024 GLE450: This engine has twin turbos. On second day of ownership a "yellow turtle" warning light appeared on dash. This indicated loss of significant engine power (i.e. hence the "turtle mode"). This happened, without warning, multiple times on highway during first few days of ownership. I think this means the turbochargers were "deactivated" or taken "off line" by vehicle's management system. Result was suddenly compromised ability while passing and ability to maintain highway speed to safe exit. Checked vehicle in to MB Service Department (on day five of ownership) for analysis and repairs. Vehicle subsequently in shop for 29 days!; 8/3/23-8/31/23 Repair order is more than two pages, single spaced. Appears dealer Service Dept ultimately "Replaced crank case vapor oil separator on top of valve cover." I tried to upload Service Invoice but wouldn't let me do it.

NHTSA ID

11561666

Incident

Aug 3, 2023

Dear Dealer Partners, 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 Thursday, November 19th, 2026. After November 19th, we will no longer accept returns of these parts. Return these parts 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.

Complaint Check engine light illuminated, or previously on One of the below Exhaust Flap fault codes stored in PTCU N127: P13C273 P13C278 P140473 Cause Various Remedy 1. Thaw exhaust system if ice is present. 2. Update software of N127 PTCU. 3. Check the exhaust flap for free movement. 4. Replace exhaust flap actuator. (P13C273 and P13C278‑ Right side flap, P140473‑ Left side flap). Ensure anti‑rattle spring is installed in correct position. 5. Clear fault codes and check exhaust flap for free movement via actuation. If fault code reoccurs: ‑Replace muffler with exhaust flap actuator. Note: For vehicles with two exhaust flap actuators, the left and right actuator have different part numbers. Installing two of the same side part number will cause fault codes due to missing LIN messages.

Complaint Oil seeping from turbocharger oil return line at connection to engine block. Low oil level warning. Oil observed under vehicle. Cause Return line under tension due to turbo rotation. Remedy Inspect turbocharger housing for rotation (refer to attachment). If rotation is confirmed, the turbocharger and oil return line must be replaced.‑Resealing or replacing only the oil return line is not sufficient and will not resolve the symptom.‑Clean noise insulation on right side of engine if necessary. Replace insulation if cleaning is not sufficient.‑Observe foot notes regarding additional parts in XENTRY parts information when ordering turbocharger.

Complaint Customer concern of Air Conditioning not cooling. *NOTE ‑ Use of tracer DYE for leak checks is not approved. Only approved leak check procedures as per WIS are approved. Cause Possible refrigerant leak. Remedy Perform the following measures : *Important* ‑ Photo documentation requirement is no longer in effect as of 10/1/2025. Remedy 1: Replace Evaporator (Only applies to vehicles produced PRIOR to April 15, 2022 and has NOT had the evaporator replaced previously) 1. Ensure that the rest of the AC system has been thoroughly checked for leaks with forming gas as per WIS before condemning the evaporator. 2. If no other leaks are found, replace the evaporator 3. *Important* ‑ when you get the new evaporator, check the expansion valve bracket to see if there are any bends (see attachment "Bent Bracket"). a. If bent, remove the expansion valve and bracket and check for damage to the flange (see attachment "Flange Damage"). i. If damage is found, order another evaporator and claim the part under parts warranty. The warranty claim MUST include a photo of the damage found. ii. If no damage is found, flip the bracket and torque to 7Nm. Check the evaporator for proper sealing before fully installing. b. If no bends are found, the evaporator should be installed in the vehicle. Note ‑ *If the evaporator housing has been opened or the evaporator or housing has been tampered with, the claim will be debited. Remedy 2: (Applies to all vehicles produced on or AFTER April 15, 2022 up to August 1, 2025) 1. Ensure that the entire AC system has been thoroughly checked for leaks with forming gas as per WIS . 2. If no leaks were found AND the system came in with no cooling/low charge, OR the evaporator is suspected of leaking: 3. Replace ONLY the expansion valve bracket, seals, and bolts as supplied in kit A 167 832 47 00, in accordance with the procedure outlined in WIS document AR83.30‑P‑5520ME. 4. IF THE PRODUCTION DATE IS BETWEEN JUNE 1, 2023 AND JULY 1, 2024, REPLACE THE DRYER AS WELL. (NOT THE CONDENSER) 5. After, charge the system and perform a few drive cycles. 6. Recheck the vehicle for leaks. 7. If no leaks are found, the vehicle can be released. 8. If a minor leak is detected that is less than 50ppm, then perform the following steps: • If a leak is detected, fill the system with forming gas • Close all doors and windows for 10 minutes. • Vehicle off with no blower activation. • Open the driver's door and measure ppm detection as soon as the door is open and the sniffer goes into the vehicle. • If no leaks are measured, fill the system and release. • If you still feel the evaporator is needed/leaks are still detected, a TIPS case is required for replacement. Provide all documentation listed in Remedy 3. Remedy 3: (Only applies to vehicles produced AFTER August 1, 2025) Ensure that the entire AC system has been thoroughly checked for leaks with forming gas as per WIS . If no leaks are found or the expansion valve has been found to be leaking, remove the expansion valve and check the bracket. If the bracket is bent, replace the expansion valve bracket, seals, and bolts as supplied in kit A 167 832 47 00. In the warranty submission, include photos of both sides of the bracket and a side profile so it can be seen that the bracket is bent. If the bracket is NOT bent or leaks from other locations are found, then open a TIPS case with the following: 1. Initial Quick Test 2. Create a short video of the actual pressures via AC machine, showing the engine running, and hold a copy of the VIN/RO in view as well. 3. OBS recording of XENTRY AC actual values of compressor request to be on and current value. (Instructions in Attachments) 4. Video recording of the leak being found via sniffer at the R/F AC drain after removing the under dash panel if the evaporator is suspected. (see attached videos) 5. If the evaporator is found to be leaking via sniffer, another video needs to be uploaded (or a continuation if only making the video after checks

Issue A software update will be performed that provides enhancements to the robustness and system stability of the communication module. The update is free of charge and runs in the background, which takes about 8 minutes to install. During this time, the vehicle can be driven without any restrictions, and the new software will be active with the next ignition cycle. Remedy MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit.

Complaint Vehicle will not start after DC charging Warning in the instrument cluster related to High‑voltage on board electrical system The following fault codes related to stuck contactor can be found in the High Voltage Control units : PTCU ‑ N127 (Powertrain control unit) • P154900 ‑ There is a warning due to overcurrent in the charging system of the high‑voltage electric circuit. • P154A00 ‑ There is a warning due to a detected crash event at standstill. • P154B00 ‑ There is a warning due to a stuck contactor. DCB223 ‑ N116/5 (Direct current charge connection unit) • P0E8929 ‑ The input current of the on‑board DC charging connection unit is too high. There is an invalid signal. • P2BC500 ‑ The contact ''Positive terminal'' of the contactor in the on‑board DC current charge‑connection unit is jammed closed • P2BCC00 ‑ The contact ''Negative terminal'' of the contactor in the onboard DC current charge‑connection unit is jammed closed. Instrument cluster warning messages : Cause • Current ripple due to EVSE (Electric Vehicle Supply Equipment) • Overcurrent or Overvoltage due to EVSE (Electric Vehicle Supply Equipment) • DCB contactors did not open immediately due to welding time at the end of DC charging Remedy • Check for a new software availability for DCCU (N116/5 ‑ Direct Current Charge connection Unit). If a new software is available, update the software first. • Reset contactor fault through special procedure without password. ( N116/5 >> Special Procedure >> Resetting of contactor fault.) Important Note : • Do not replace component DCB (N116/5) • If fault codes are not erasable, please raise a TIPS case and send it to HQ.