really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
7,917 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2012 Mercedes-Benz ML350 engine problems

engine problem

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2012 Mercedes-Benz ML350 Owner Comments

problem #9

Jun 222016


  • 42,500 miles


Our 2012 mb has 42500 miles on the engine warning light came on it is related to the blue additive emission apparently this has been a common occurrence from what I read on line, mb will not cover this and they charge $3000 to fix, after researching online Mercedes are aware of this but do care about it and will not stand behind their product,1 mechanic implied they raised the part price to repair this knowing this has been an issue, profiting from their defective product.

- Independence, MO, USA

problem #8

Jul 312012


  • 50 miles
From the day one, during the first 25 minutes of driving, my new 2012 mb ML350 vibrates and make grinding noise just in between 40 to 45 miles per hour steady driving. After about 30 minutes of driving, the vibration and the noise are not noticeable. Mb and the dealer were trying to fix the problem but failed to resolved the problem. Now, they have concluded that the vibration is normal and is characteristic of the car. Any problems mb can't solve is normal!! what kind of car is it that vibrates for first 25 minutes of driving at certain speed is normal!!

- Centreville, VA, USA

problem #7

Oct 202013

ML350 6-cyl

  • 3,600 miles
I stopped at a red light. The 2012 ML350 engine stalled. I could have been in a accident. Luckily, the car behind me did not hit me. I had to start the engine again.

- Glendale, CA, USA

problem #6

Jul 012013

ML350 6-cyl

  • miles


The contact owns a 2012 Mercedes Benz ML350. The contact stated that the vehicle stalled without warning. The contact took the vehicle to the dealer where it was determined that the software needed to be updated. The contact was also told by the dealer that the front rotors and brakes needed to be replaced. The vehicle had not been repaired. The failure mileage was unknown, but the current mileage was 24,882.

- Bronx, NY, USA

problem #5

May 182012

ML350 6-cyl

  • 200 miles
The vehicle stalled after the first week of picking up a brand new vehicle at a traffic light. Dealer replaced high pressure fuel pump, but the vehicle continued to stall on many different subsequent occasions randomly. There were a few times that the car died repeatedly on consecutive days. Dealer was unable to diagnose the exact problem since it occurs randomly, and Mercedes was unable to provide any resolution to remedy stalling issue. Dealer mentioned that Mercedes headquarter aware of the symptoms but has no fix in the mean time. Although the engine has stalled mostly during a complete stop, it could possibly stall while the vehicle is in motion, which could pose a greater risk to drivers especially female driver with a baby inside who does not know how to react appropriately in such endangered situation.

- San Ramon, CA, USA

problem #4

Mar 012013

ML350 6-cyl

  • 21,200 miles
My wife was driving my ML350 on the freeway with my 7 year old son in the back. She said the vehicle started to shake in an unusual way so she decided to get off at the nearest exit and when she applied the brakes on the off ramp the car's engine stopped. Engine light came on, dash read inoperable yet all the electrical was still on. She tried to turn the key and restart it but the car would not start. Before this incident we had not experienced any problems. This is a 2012 model with just over 21,000 miles and was just serviced two weeks prior to the incident. It happened all of a sudden. The car was hit by another vehicle- rear ended with both my wife and son still in it.

- Woodland Hills, CA, USA

problem #3

Apr 102012

ML350 6-cyl

  • 500 miles


This happened as a new car, only now, after it happened about 5 or 6 times, we came to know this weired and dangerous problem-it loses the power at a stop; at red light, and even when we tried to start to move. When it happened, at first several times, we were thinking maybe I did something, after 5 to 6 times happened to me and to my wife, we just came to understand it is such dangerous problem. Now, it happened again on Friday and we went to the Mercedes dealer, we came to know more, many happen like this, we are not the first; Mercedes no solution, even they tried to find. So far, still no solution at all. The service guy declared that it only stopes at a stop!! they cannot do anything as Mercedes still no solution!! will anyone drive such a weird car it stopes you at stop"? what happen if it stops you on the middle of the high way?? what will happen if somebody hit you from the back?"

- Irvine, CA, USA

problem #2

Feb 172012

ML350 6-cyl Diesel

  • 3,000 miles
Vehicle loses power after a few hours of driving. This problem does not show any error message on the dashboard, and the dealer cannot fix this problem after multiple attempts. Last trip to the dealer which was 2 weeks ago, they insisted that nothing was wrong. Here are examples of how serious the problem is, I was stranded and had to shut the car down for 30 - 45 minutes to let the car reset before continue driving. I was stranded on grapevine while driving back from san francisco to los angeles. The car could barely pull itself up the hill, and freeway 5 was under construction without much service lane that I can pull out. I got lucky and got to pull out before big rig slam into my back. This car will sporadically loses power on surface street which almost landed me into a head on collision while trying to make left turn across oncoming traffic because it will not move forward. Currently, my car has about 8000 miles. I have been contacting mbusa, but there is no sense of urgency on their end. I filmed and took photos while the problem is in session because car computer will not log any. www.youtube.com/watch"feature=player_embedded&V=opqqfzt8zow www.youtube.com/watch?feature=player_embedded&V=uzedc-tncsu www.youtube.com/watch"feature=player_embedded&V=M_zwnzwz_ly I have a bit more videos and photos, but they are just the repetitive of what I posted above. I posted pictures on the mbworld forum. mbworld.org/forums/new-M-class-W166/466026-so-many-problems-my-2012-ML350-bluetec.html [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Los Angeles, CA, USA

problem #1

May 172012


  • 200 miles
The contact owns a 2012 Mercedes Benz ml 350. The contact stated that the vehicle would not start until after several attempts. While driving, the vehicle began to lose power. The vehicle was taken to the dealer for diagnosis, who stated that they needed to replace the pistons in the engine. The vehicle was repaired. The manufacturer was contacted. The failure mileage was 200 and the current mileage was 800.

- Cypress , TX, USA

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