2015 Mercedes-Benz ML350 Owner Complaints

The failed/malfunctioning component appears to be the fuel pump controller / fuel pump control unit, and possibly the fuel pump system. The Mercedes-Benz dealer identified water/moisture-related damage and corrosion at the fuel pump controller area. The failed component should be available for inspection if the dealer preserves the part during repair. I have requested that the dealer not discard the damaged component. My safety and the safety of others were put at risk because the fuel pump controller is related to fuel delivery. If it fails, the vehicle may not start, may lose fuel supply, or may stall while driving. This creates a safety risk, especially if the vehicle stalls in traffic, at an intersection, on a highway, or during normal driving. The problem has been confirmed by a Mercedes-Benz dealership. The dealership diagnosed water/moisture damage to the fuel pump controller area and provided an estimate of $768.22 for fuel pump controller replacement, plus $244.88 for the inspection fee. The dealer also indicated that this was the first inspection and that the fuel pump itself may also need further inspection or may have related damage. The vehicle/component has been inspected by a Mercedes-Benz dealership. Mercedes-Benz USA / the manufacturer’s representative has also reviewed the case through its goodwill process, but they refused to treat it as recall-related coverage. To my knowledge, the vehicle has not been inspected by police or insurance representatives. Prior to the current failure, the vehicle had starting/no-start related symptoms beginning around the middle of 2023. The engine could not start successfully at times. I do not recall receiving a clear warning lamp or message specifically identifying the fuel pump controller before the failure. However, the symptoms were consistent with a fuel delivery problem, and the dealer later confirmed water/moisture corrosion damage in the fuel pump controller area.

NHTSA ID

11739473

Incident

May 2, 2026

In July 2025, the sunroof panel had lifes and was flapping at highway speeds. I immediately contacted a Mercedes-Benz dealer to report the hazard. I was told they were unaware of such an issue and that I would have to pay for the repair out-of-pocket. Due to financial hardship, I could not afford the repair at that time. in. In early February, while driving on the highway, the entire sunroof panel catastrophically detached and flew off the vehicle. This created an immediate and severe road hazard for other drivers. This incident matches the 'adhesive bonding failure' described in other Mercedes-Benz sunroof recalls (e.g., Recall 21V-197), but my specific VIN was not included in that list.

NHTSA ID

11719355

Incident

Feb 6, 2026

In mid-trip as we were going down the highway went to change lanes and the turn signals were no longer functioning. No errors, no alerts, no warnings they just stopped working. After pulling over and turning off the vehicle and turning back on they work for a time then stop working again. After researching with other owners of these and similar model Mercedes Benz vehicles this is a prevalent and highly dangerous safety issue that many many others have experienced.

NHTSA ID

11711956

Incident

Jan 19, 2026

Cam Shaft replacement diagnosed after week and half visit to Mercedes Benz dealership for engine rattling at cold start up. We are left with a $10,000 repair after performing all scheduled maintenance at the Mercedes Benz dealership since owning in 2015.

NHTSA ID

11676806

Incident

Jul 15, 2025

The contact owns a 2015 Mercedes-Benz ML350. The contact stated that while driving at various speeds, the vehicle shook abnormally before the vehicle lost automotive power. The contact was able to restart the vehicle and take the vehicle to a local dealer. The contact stated that the vehicle was repaired under NHTSA Campaign Number: 22V955000 (Fuel System, Diesel, Fuel System, Gasoline); however, the repair failed to prevent the failure. The contact stated that two weeks after the recall repair, the failure reoccurred. The check engine warning light was illuminated. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The vehicle was scanned by a local independent mechanic who retrieved DTC: P035413, A10D, P072102, U016886, V1FBD04, 94C3, V1DAV54, V1DBD31, P030085, and V142E31. The manufacturer was made aware of the failure. The failure mileage was approximately 88,000.

NHTSA ID

11652759

Incident

Mar 22, 2025

Mileage

88,000 mi

I was in drive mode and was looking to park the car on the open spot on the street. Had engaged the reverse gear and was attempting to get in the parallel parking spot. While i was doing that, suddenly the wheel locked up and car stopped with a jerk/jolt. Then came warning that the parking brake was not working (Remember I had not engaged the parking brake as I was in drive mode). The locked up wheel would not move and I had great difficulty in making the car safe in the cross traffic. The issue here is parking brake cannot engage by itself. That has nothing to do with the age of the car, it is like the wheel cannot come off just because the car is old. This could have easily happened while the car was in motion at a higher speed, in that case with 1 wheel locked, a car would spin out of control in a moving traffic causing major damage to other vehicles and myself. Mercedes's rep claimed it was a maintenance item. Parking brake engaging by itself is a maintenance item?? We should put a notice to all customers and your life is in danger because the parking brake can engage by itself locking the wheel anywhere anytime. I am very apprehensive of this design which allows for auto lock of a wheel. It must be investigated and all the parking brake systems should be replaced as it can happen to anyone. Thank you

NHTSA ID

11592867

Incident

May 31, 2024

The contact owns a 2015 Mercedes-Benz ML350. The contact stated while reversing, the vehicle stalled and failed to restart. The vehicle was towed to the local mechanic who determined that the fuel pump was faulty and needed to be replaced. The fuel pump was replaced, and the vehicle was repaired. The local dealer and manufacturer were notified of the failure, but no assistance was offered. The contact was informed that the VIN was included in NHTSA Campaign Number: 22V955000 (Fuel System, Diesel, Fuel System, Gasoline). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 120,000.

NHTSA ID

11589651

Incident

Apr 10, 2024

Mileage

120,000 mi

The center console box will jot close. I have researched and this is a common problem with this car. You can not just replace the closure part it requires a whole new box. This is at a cost of 400.00plus dollars. This is obviously a defect.

NHTSA ID

11577425

Incident

Apr 2, 2023

precense of some liquik oil from up motor litle meiby ist because change oil because i buy recently , i need observed ,ore time today i clean this area.

NHTSA ID

11565307

Incident

Jan 10, 2024

The contact owns a 2015 Mercedes Benz ML350. The contact stated that the rear driver’s side door failed to close properly after several attempts. The vehicle was taken to a dealer and the contact asked the mechanic to inspect the vehicle. The door failed to open after several attempts. The contact was provided an estimate for the repair. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 58,000.

NHTSA ID

11544793

Incident

Jun 1, 2023

Mileage

58,000 mi

The contact owns a 2015 Mercedes-Benz ML350. The contact stated while reversing, there was an abnormal sound coming from the vehicle. No warning light was illuminated. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure and determined that the VIN was not included in a recall. The failure mileage was unknown.

NHTSA ID

11543484

Incident

Jan 24, 2023

The contact owns a 2015 Mercedes-Benz ML350. The contact stated while driving at undisclosed speeds, the vehicle temporarily lost motive power before returning to normal driving functionality. There was no warning light illuminated. The vehicle was taken to a dealer and the contact was informed that the check engine light displayed after repairing the vehicle under NHTSA Campaign Number: 22V955000 (Fuel System, Diesel, Fuel System, Gasoline). The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 79,000.

NHTSA ID

11540040

Incident

Jun 1, 2023

Mileage

79,000 mi

In April 2023, while performing a rear brake service both right and left suspension springs were found with deteriorated suspension spring coating, corrosion and breakage of the coil springs. Suspension spring failure poses a safety hazard and risk of damage to other suspension components. It is unclear when exactly the springs broke but when the vehicle was inspected in Feb of 2022 there was no mention of spring breakage. The date of incident is the date I discovered the spring breaks. I only took a pic of the one spring but both were confirmed broken. MB dealership confirmed breakage. Communication with Mercedes Benz was not successful.

NHTSA ID

11525691

Incident

Apr 22, 2023

The contact owns a 2015 Mercedes-Benz ML350. The contact received notification of NHTSA Campaign Number: 22V955000 (Fuel System, Diesel, Fuel System, Gasoline) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated while driving approximately 40 MPH, the vehicle started to lose motive power and was making an abnormal sputtering sound as if the vehicle was running out of gasoline. The contact stated that the vehicle stalled with the check engine warning light illuminated. The contact pulled over and was able restart the vehicle. The failure had become a recurring failure. The manufacturer had not been made aware of the failure. The failure mileage was approximately 104,000. Parts distribution disconnect.

NHTSA ID

11523279

Incident

May 14, 2023

Mileage

104,000 mi

Engine stalled multiple times even though it has been serviced multiple times at multiple dealers.

NHTSA ID

11517158

Incident

Apr 14, 2023

I took my car in for a different repair and they found this issue as well. "Diagnostic - Oil leak (Visual): front covers leaking oil down front of engine." The leak was due to a crack in the sealing cap. My car 2015 Mercedes ML350 4Matic is in the recall for 2018070015 but my VIN number was not included in the recall although I am having the exact issues the recall covers. Recall 2018070015 "correct oil level as necessary and replace the reservoir sealing cap to prevent oil foam from leaking out."

NHTSA ID

11508373

Incident

Feb 8, 2023

There is a recall for this significant safety risk. I contacted my local Mercedes Benz about recall remedy on 6 January 2023 and they confirmed the recall and said MB would issue steps to get this taken care of in the beginning of February. It is now 18 February 2023 and this has not happened and I have received no communication from MB and yet the safety risk still exists and could be life threatening.

NHTSA ID

11507997

Incident

Dec 21, 2022

My viechle is loss of propulsion without warning on the freeway last week on a raining day. After brought the car to West Covina Dealer inspected the car is leaking water that has entered the spare wheel well, the accumulated water could intermittently contact the fuel pump control unit caused loss propulsion. And there are some circuit boards and wires damaged due to a water leak and not drive able. The West Covina MB dealer is refuse to fix until MBusa responsible for the cost. Please help what other option we have about this issue?

NHTSA ID

11502923

Incident

Jan 13, 2023

Steering wheel tilt adjustment failed. Without adjustment it is impossible to steer the automobile safely due to hand placement for control. This is apparent especially when there are multiple drivers. There is not a manual over ride since the system is controled electrically

NHTSA ID

11496940

Incident

Dec 6, 2022

The contact owns a 2015 Mercedes-Benz ML350. The contact stated while driving at an undisclosed speed, the engine seized without warning. The vehicle was towed to the local dealer where it was diagnosed there was a possible mechanical break down due to engine sludge, ignition varnish rust, corrosion, dust, cracked rubber, dry rot, road chemicals, alterations or improper oil, coolant, fuel, or lubricants. The vehicle was not repaired. The manufacturer was not contacted. The approximate failure mileage was 70,273. The contact stated that they did not submit this complaint and the vehicle actually belongs to another individual.

NHTSA ID

11487180

Incident

Jul 25, 2022

Mileage

70,273 mi

takata airbags- call Mercedes Benz of Draper says it is not on their list????

NHTSA ID

11486917

Incident

Sep 28, 2022

Neither back doors on my 2015 ML350 lock. Even after you try to lock them from the inside anyone can open the doors from the outside. This is a huge safety hazard because someone could easily car jack the car while you are in it. I bought the car new from the local dealer and i have reported this to the dealership and they said it was a known problem and that acutuators on both doors needed to be replaced at a large cost to me. I wrote to Mercedes Corporate to report this and to ask for financial assistance in trying to get it corrected and was told to just report it to you. Thank you for any assistance that you can provide.

NHTSA ID

11479779

Incident

Jan 1, 2019

The contact owns a 2015 Mercedes-Benz ML350. The contact stated that while the vehicle was parked in the driveway, she noticed an unknown fluid leaking from the vehicle. Over time, the contact noticed that an unknown pink fluid had also started to leak form the vehicle. On one occasion while driving 25 MPH, the vehicle started to hesitate with an abnormal popping sound coming from the vehicle. The contact stated that dark blue smoke was coming from the vehicle. The vehicle eventually stalled without warning. The vehicle failed to restart for almost an hour. The vehicle eventually restarted after multiple attempts and was driven back to the residence. The following day, the vehicle was towed to the dealer where they discovered that water was leaking into the exhaust and had caused the failure. Upon investigation, the contact discovered NHTSA Campaign Number: 18V272000 (Suspension) which she linked to the failure. The manufacturer was notified of the failure and the contact was informed that the VIN was not under recall. The vehicle was not repaired. The failure mileage was unknown.

NHTSA ID

11470207

Incident

Jun 7, 2022

The contact owns a 2015 Mercedes-Benz ML350. The contact stated that while the vehicle was parked and attempting to seat the child in the car seat, he noticed that the seat belt was loose. The contact checked the car seat and pushed the seat to one side and the seat belt unwound and retracted to the normal position. The contact had taken the vehicle to a local dealer who diagnosed that the seat belt latching system had failed and needed to be replaced. The vehicle was not repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 105,000.

NHTSA ID

11466404

Incident

May 22, 2022

Mileage

105,000 mi

The contact owned a 2015 Mercedes-Benz ML350. The contact stated that while driving approximately 40-45 mph in the rain, he drove over a puddle of water and hydroplaned on the highway and hit the jersey wall, went across the highway, and crashed into the guard rail. The air bags did not deploy. There were no warning indicator lights illuminated. The contact sustained injuries to his shoulder and medical attention was provided. The passenger occupant sustained injuries to the vertebrae and medical attention was provided. A police report was filed. There was no reported fire. The vehicle was towed to an independent lot. The local dealer was contacted but the vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 120,000. The vehicle was deemed a total loss by the insurance company.

NHTSA ID

11463448

Incident

May 1, 2022

Mileage

120,000 mi