2013 Mercedes-Benz ML350 engine problems

Filed Oct 23, 2026 · Engine, Fuel system · AZ

Vehicle: 2013 Mercedes-Benz ML350 BlueTEC (OM642 3.0L V6 Turbo Diesel) Current Mileage: Approx. 117,925 miles Dealer / Location: Mercedes-Benz of North Scottsdale (RO #260467) Summary of Safety Issue & Defect: The vehicle is experiencing an active liquid diesel fuel leak from a replacement fuel pump assembly that was previously installed by an authorized Mercedes-Benz dealership four years ago. Active diesel leaks directly over/near hot engine and exhaust components pose an acute, severe vehicle fire hazard and expose cabin occupants to toxic diesel fumes. Additionally, the vehicle exhibits a severe oil leak in the engine inner-V caused by prematurely degraded factory oil cooler seals (addressed in Mercedes TSB LI18.30-P-055434), along with an active DEF reductant heater circuit fault (DTC P20BD). The dealership confirmed the fuel leak but refused to rectify or honor Goodwill coverage for the prematurely failing fuel pump, presenting a repair quote exceeding $14,000. Active fuel component leaks present an unreasonable safety risk to vehicle occupants and surrounding traffic.

Filed Jun 1, 2026 · Electrical, Engine · GA

the federal safety agency VEHICLE SAFETY COMPLAINT SUPPORTING STATEMENT Vehicle: 2013 Mercedes-Benz ML350 I am submitting this complaint regarding a continuing safety concern involving water intrusion and electronic system damage in my 2013 Mercedes-Benz ML350. My vehicle was subject to a Mercedes-Benz recall involving water intrusion and related components. Despite recall-related repairs being performed, moisture and water intrusion concerns remain unresolved. During the diagnostic process, Mercedes-Benz personnel identified evidence of water and humidity in areas associated with vehicle electronics and control modules. The vehicle has experienced repeated mechanical and electronic issues following discovery of the water intrusion condition. Multiple repair facilities have been involved, and I have incurred significant diagnostic and repair expenses while attempting to determine the full extent of the damage. The primary concern is not ordinary wear and tear. The concern is that water intrusion has affected vehicle systems and that the recall remedy has not resulted in a complete resolution of the condition. I am concerned that moisture exposure may continue to impact vehicle electronics, control modules, sensors, and other safety-related systems. Mercedes-Benz USA has been notified and a case has been opened. The dealership has also been involved. However, despite escalation requests and requests for management review, I have not received a meaningful resolution. The dealership continues directing me back to Mercedes-Benz USA while Mercedes-Benz USA has not provided a final management response. I respectfully request that the federal safety agency review whether the recall remedy adequately addressed the water intrusion condition and whether additional investigation is warranted regarding continuing moisture intrusion, electronic system exposure, and potential safety risks associated with this condition. I am prepared to provide repair orders, recall documentation, photographs, diagnostic findin

Filed Jan 15, 2026 · Engine, Fuel system · 96,000 miles · FL

The contact owns a 2013 Mercedes-Benz ML350. The contact stated that while driving approximately 40 - 45 MPH, the vehicle stalled in the middle lane. The driver was able to push the vehicle safely to the roadside. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed, and determined that the fuel pump needed to be replaced. The vehicle was repaired. The following day, it took two minutes to start the vehicle. The vehicle was drivable, but the vehicle eventually stalled while driving. The vehicle was towed to another local dealer, Mercedes-Benz of South Orlando (4301 Millenia Blvd, Orlando, FL 32839), where it was diagnosed with a faulty fuel sensor and control valve. The parts were replaced. The contact stated that the fuel pump was replaced four times, but the failure persisted. The manufacturer was contacted and escalated the failure was escalated to an engineer for assistance. The failure mileage was approximately 96,000.

Filed Sep 10, 2025 · Engine · MI · fire

The engine locked up after blowing the top part of the engine off, fire shot out of the engine and quickly went out like a flam thrower. I was driving on the expressway when the accelerator would not work without any warning I didn’t have any issues with this truck. The car cut off immediately thank God I was able to coast to the side of the expressway because it stopped in the left lane on the expressway I was scared for our lives. The dealership has the truck and they said the engine is locked up. This morning s unacceptable for a car I’ve had for a year.

Filed Sep 24, 2024 · Engine · 66,000 miles · IL

The contact owns a 2013 Mercedes-Benz ML350. The contact stated while adding washer fluid to the vehicle, the contact became aware that there was oil leaking from the upper timing chain covers down onto the alternator. The vehicle was taken to an independent mechanic, where it was determined that the upper timing chain covers needed to be removed and resealed. Additionally, the mechanic informed the contact that the oil needed to be cleaned off the engine and the alternator. The contact stated that upon investigating the failure, the contact became aware that the upper timing chain cover coating material did not allow the cover to seal properly. The vehicle was taken to the dealer to be repaired. The vehicle was repaired. The manufacturer was notified of the failure and a case was opened. The manufacturer referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 66,000.

Filed May 9, 2022 · Electrical, Engine · CA

2013 Mercedes Benz ML350 (W166) engine (m276) began misfiring. Palm Springs Mercedes Benz diagnosed faulty camshaft positioning sensor leaking engine oil into engine electrical harness which wicked through harness to ECU. Faulty (leaking) camshaft positioning sensor caused faulty harness, ECU, injectors, o2 sensors. Said common problem on these and other models and engines.

Filed Dec 9, 2021 · Engine · OR

The seal for the oil cooler is leaking and could cause an engine fire. The Mercedes repair says they only expect this repair to last 30,000 miles before it fails again. Each time this fix occurs it is a $4,800 repair by the dealer as they have to tear the engine apart to replace it. This is a known issue but there are no recalls. Oil runs under the entire car and on to the braking surfaces as well. I was told by the Mercedes dealer that fires have happened from this while driving or as the car or SUV is parked.

Filed Feb 5, 2019 · Engine · WA

Oil cap from the top of the engine leak oil slowly causing the oil get into the air hose in front of the engine. Engine light comes on.

Filed Nov 19, 2018 · Engine · 120,000 miles · IL

Tl* the contact owns a 2013 mercedes-benz ml350. While the vehicle was stationary and while driving various speeds, the oil cooler failed. The contact stated that a significant amount of oil leaked onto the engine during a routine oil change. Sullivan-parkhill imports (401 west marketview drive, champaign, illinois 61822, (217) 352-4161) diagnosed that the cooler gasket was faulty and needed to be replaced. In addition, the dealer stated that the engine needed be to cleaned due to significant amounts of oil leaking onto the motor of the diesel engine. The vehicle was taken to be repaired. The manufacturer was made aware of the failures. The failure mileage was approximately 120,000. *tt consumer oil seal leak -blows oil over all over engine.

Filed Sep 12, 2018 · Engine, Seat belts · 92,273 miles · MI · 1 injury

I was driving on the highway at 70 MPH, the check engine came on and about 5 seconds later, a loud noise came probably from the engine. The car then started jolting back and forth; I hit my head on the steering wheel twice and got almost knocked out. The engine stopped while I was still running at 70 MPH. Most if not all the lights in my dashboard came on then I started slowing down. The seat belt never tightened on me as the car was jolting. I kept the car rolling and got out of a very dangerous situation. As the car came to a halt, a lot of engine oil leaked on the street, maybe about aquart. I took a picture as I just got out of the car. Also, as the towing took the car, the towing bed got over a quart of engine oil that leaked from my car. I towed the car to mercedez benz of novi but they refused to take it. They ordered me to towed it out and tow it back to them two weeks later. I towed it to mercedes benz of bloomfield on september 6. I notified mbusa of this incident on september 7 and provided them access to check the car but they showed no interest whatsoever in looking at the complaint as the vehicle has 92,273 miles and is out of warranty. They instead offered me a $2,000 discount on a purchase of another vehicle. Neither the dealership nor mbusa verified the car for safety related issues on the engine or seat belt though it was and still is parked at the mb dealership of bloomfield. I could have easily went unconscious from the jolting and hitting my head on the steering wheel. I think there is a major safety issue that requires at a minimum for the manufacturer to look at let alone issue a recall for safety reasons on the engine and the seat belt.