2011 Mercedes-Benz E350 Suspension Problems

Rear crossmember or ( rear subframe frame ) rust and It broke due to corrosion

NHTSA ID

11688969

Incident

Sep 22, 2025

This vehicle, with 115,000 miles has been discovered to have had the brackets in the subframe for BOTH rear lateral arms rust through and are broken causing a $5,000 repair estimate. The mechanic who found this (42 years as a mechanic) said he has never seen anything like it. This is a car where I had to replace the transmission at 49,000 miles and the control unit at 62,000 miles (over $13,000 in repairs). I saw through AI search that this problem has been reported many times but has not prompted an investigation. This issue should NEVER happen and is a MAJOR SAFETY threat.

NHTSA ID

11652830

Incident

Apr 3, 2025

Broken rear sub frame.

NHTSA ID

11630893

Incident

Jul 10, 2024

Driving on interstate, hit the brakes and noticed the car was swaying hard to the left. After that it progressively got worse. When hitting even the smallest bump or braking I heard a metal on metal ‘thunk’ sound. My daughters were in the car and it was frightening. Upon further inspection by a Mercedes mechanic, the secondary frame had rusted and snapped into. After reading forums online I found it’s very common. They rust from the inside out. There was absolutely NO previous warning.

NHTSA ID

11611182

Incident

Aug 21, 2024

Rear subframe rusted and broken apart.

NHTSA ID

11609172

Incident

Aug 17, 2024

While driving at approximately 55mph on the highway, I was required to brake for a merging vehicle who decided to make a lane change at the last second. I used my breaks, and my car did not break correctly. Instead, the car pulled the the right and locked up, it felt as though I had lost control of the car. When I went to my mechanic, I thought it was a break issue. Instead, it turns out the whole rear sub frame had rusted. When researching this issue, I found many other similar experiences. The harm that this part failure lead to was extreme. This could have been deadly. This is a safety issue that the manufacturer does not address.

NHTSA ID

11559920

Incident

Dec 13, 2023

Purchased vehicle May 22, 2023 at Direct Auto Sales of Orlando, Florida. Approximately two and a half weeks later the subframe broke away from the support arm rendering the vehicle in an inoperable and unsafe condition. A local mechanic said this vehicle should not have been driven. He said we could have been in an accident and suffered severe injuries or even death. Mercedes Benz of South Orlando inspected the vehicle and reported the subframe, fuel tank, front and rear axles, exhaust system, support arms, motor mounts, etc need replacing. Cost is $30,000. How could anyone fail to see damage this extensive.and not report it.

NHTSA ID

11532967

Incident

Jul 18, 2023

2011 MERCEDES BENZ E 350. CONSUMER WRITES SEEKING REIMBURSEMENT FOR REPAIRS MADE TO ROTTED SUBFRAME ON VEHICLE.

NHTSA ID

11509501

Incident

Feb 28, 2023

The rear subframe has prematurely rusted. It had a shear failure at speed on the highway when I applied the brakes. The rear end of the car swerved, almost causing me to crash. I did manage to decelerate the car in a controlled fashion. I did not know the rear subframe failed at the time. This was confirmed by an independent mechanic several days later. After research, it looks as though a recall has already been issued for this issue in Canada and potentially Germany. The mechanic tells me that until the issue is repaired the vehicle is unsafe to drive. My and others safety was put at risk due to the failure of vehicle control at 65 mph on a busy road. The problem was verified by an independent mechanic. No police, insurance provider, or Mercedes dealer has inspected the car/damage, only an independent mechanic. No prior indicators were given either directly or indirectly prior to failure. I did keep the part for inspection upon request.

NHTSA ID

11506572

Incident

Feb 5, 2023

I was on the highway traveling at 70 mph, when I noticed something was not right. I would switch lanes and notice the vehicle swaying in the rear I would also brake, and notice car would sway. I didn’t have any warning signs, and have deemed my vehicle unsafe to drive. Upon further inspection, I noticed that the rear subframe has been compromised with rust, fully detaching the lower control arm from driver’s side rear. This incident could have been catastrophic. I could have easily loss control of the vehicle and death could have occurred to me and others. Perhaps the whole rear axel and wheels could have detached at high speeds

NHTSA ID

11499814

Incident

Dec 29, 2022

There is a hole rusted through the vehicle's rear subframe assembly and it is dangerous to drive. My car is an E350 Mercedes with 78,000 miles and garage-kept. Mercedes knows of this issue and is not helping anyone with this problem. The job costs about 5000.00 to fix.

NHTSA ID

11498730

Incident

Dec 23, 2022

I noticed fluid on the ground under my car in the driveway. Turns out it was brake fluid, the vehicle alerted me to low brake fluid. Here was a broken brake line which appears to have been caused by the subframe being rusted out. The issue is with the rear subframe on the Mercedes’ E and C class dating from 2008 on. Mine is a 2011 E class. The subframes on these vehicles rust and rot out causing issues to the brake lines and rear suspension parts rotting / rusting out due to the subframe being compromised. I’ve taken my vehicle to the dealer to look at the brake line and I was advised that the subframe was rusting out and should be replaced as well, it will only worsen, creating a safety hazard while driving because it can cause the car not to stop properly and difficult to control. I’ve taken the vehicle to repair shop and was told the same. Also was advised by both the dealer and private repair shops that this is a common issue with these vehicles, yet there is no recall by Mercedes in this country. Canada has a recall for this issue and other countries as well but not the USA. I was quoted $5000 to fix the issue by putting a new subframe, repairing is not possible. The part itself is on back order almost everywhere due to the commonality of this issue. This has caused the price to go up in cost due to the demand. A junkyard / car parts quoted me $2000 for a used subframe. As a service connected disabled Veteran I find this issue to be very concerning and ask why this is not a recall that Mercedes should replace without cost to the consumer. I hope that my complaint and hopefully others as well can get this issue resolved and hold Mercedes accountable. The subframe rust out yet other parts around it does not, this has to be a manufacturer issue with the sub frame. Reports of this issue are in warm weather southern states with no snow or salt issues as well as northern states

NHTSA ID

11493197

Incident

Nov 10, 2022

The rear subframe failed as a result of pre-mature corrosion while traveling at 70mph. Control of vehicle was lost and could easily have led to a multiple fatality incident if not for luck. The problem has been reproduced in many Mercedes models around this model year and Mercedes is well aware of the issue with their inferior subframe. NTSA needs to order a recall from Mercedes as class action lawsuits are going to be put together if nothing is done. There was no warning that this subframe was going to fail.

NHTSA ID

11490459

Incident

Sep 30, 2022

Hello, I was driving one night I hit the brake and the car lost control ..I was able to drive home afterward I took the car to a shop and after inception They found the rear K sub frame rusted and broken. The car in excellent shape with no rust or corrosion in any other area. The car has 108k miles and always parked indoor.

NHTSA ID

11456111

Incident

Feb 9, 2022

We took our car into the local Mercedes Benz Dealership at Ft. Washington, PA for a routine service and PA inspection. Our vehicle is a 2011 MB E 4 matic and has ~70K miles. We received a call stating that the rear subframe of the vehicle had failed and was not considered safe and therefore did not pass the PA state inspection. We authorized the dealership to replace the component, which was done. The dealership suggested the corrosion may be caused by salt used for removing snow. The car was garaged routinely, washed including undercarriage routinely and the google search suggested that the amount of snow since 2011 was lower than normal. I explored the internet and it appears that this issue has been documented by others for this and other models of MB vehicles. I also found a police inquiry which suggests failure of this component could cause the vehicle to lose control during driving. I spoke with the MB USA people and they did not think there was a significant issue and that this was not a recall or warranty issue currently. I wanted to report this to you for reference.

NHTSA ID

11432427

Incident

Aug 18, 2021

The rear "K" suspension subframe assembly had to be replaced because of rust internally in the vehicle frame. There was no other rust, internally or externally visible, on the entire car. My mechanic indicated that the car would not pass inspection without major repairs at a cost of over $2800. If the subframe became disconnected, steering control would be lost resulting in a potentially serious injury due to loss of directional control at high speeds. My mechanic has already replaced parts to repair this issue on at least 4 other cars within a short period of time.

NHTSA ID

11432196

Incident

Aug 27, 2021

CAR RISES TO ONE SIDE, LOWERS TO THE OTHER. CAR PULLS TO THE LOWER SIDE. VEHICLE WAS IN MOTION, LOWERED THE MORE I DRIVE.SLOW AIR LEAK SOUND.

NHTSA ID

11309302

Incident

Feb 14, 2020

Mileage

156,000 mi