After 3yrs of ownership, finally having my first problem with my '10 E550 Coupe
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Super Member
Joined: Jul 2009
Posts: 502
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From: Miami Beach
2006 CLS55 AMG Sold 2010 E550 Coupe totaled by mechanic, '13 SL550 I totaled it, 2017 SL63 current
After 3yrs of ownership, finally having my first problem with my '10 E550 Coupe
So twice in the last week on the highway after accelerating from about 60-80mph I got the esp/traction control malfunction warning lights and a reduction of power. Car was still drivable and when I would stop and turn the car off and back on, it would be back to normal. Searched the forums and it seems to be either the steering angle sensor or possibly the key? Anyone have a similar experience?
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E350 AMG Sport coupe
Hi. Be very careful, my 2014 E350 did this on a journey last summer, it happened 2 or 3 times within 15 miles then stopped and wouldn't start. After a week with MB they had to replace the ECU at a cost of £1000.
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Super Member
Joined: Jul 2009
Posts: 502
Likes: 95
From: Miami Beach
2006 CLS55 AMG Sold 2010 E550 Coupe totaled by mechanic, '13 SL550 I totaled it, 2017 SL63 current
Thread Starter
Super Member
Joined: Jul 2009
Posts: 502
Likes: 95
From: Miami Beach
2006 CLS55 AMG Sold 2010 E550 Coupe totaled by mechanic, '13 SL550 I totaled it, 2017 SL63 current
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Joined: Feb 2018
Posts: 35
Likes: 4
From: Santa Clarita,Ca
2010 E550 coupe,2005 porsche ca 911,04 subaru outback,94 Harley FXSTC
I had same thing happen on my 2010 E550 coupe .It was accelerator pedal .Apparently it sends a noisey signal to ECM and puts the car in safe mode or limited operation strategy .When you turn it off it resets ,then will occur often on hard acceleration.Before it got bad I did notice a slight hesitation on accel from stop.
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Junior Member
Joined: Feb 2018
Posts: 35
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From: Santa Clarita,Ca
2010 E550 coupe,2005 porsche ca 911,04 subaru outback,94 Harley FXSTC
It stayed in the limited operation strategy until I shut it off and restarted it.Then was fine until I do the WOT and then it does it again ,almost every time.I also noticed all the time there is a hesitation on medium accel from low speed or stop .The accel pedal fixed it .The accel pedal causes electrical interference and causes this concern .I have seen this before on a few Lincoln LS but it was defective ignition coils causing elect noise and driveability problems. You could test the coils individually and watch the pattern on an oscilloscope to verify coil failure.
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Joined: Jul 2009
Posts: 502
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From: Miami Beach
2006 CLS55 AMG Sold 2010 E550 Coupe totaled by mechanic, '13 SL550 I totaled it, 2017 SL63 current
My car has a strange tendency to fix itself. Since this post back in April, I have only experienced it one other time a few months ago. In my other post with the starting issue, that has happened two other times in the last couple of months as well.
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Joined: May 2014
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From: Las Vegas, NV
2001 ML320; 2007 CLK350, 2011 E550 Coupe, 2020 E450 Coupe
Happened to me a few times back in 2017 on my '11 550 coupe soon after getting an OE tune. Dealer did a computer update while being serviced and I never had the problem occur since. Also wiped out my tune unfortunately. I was extremely pleased with the upgraded performance for HP and Torque with the OE tuning 7 years ago..
Junior Member
Joined: Feb 2018
Posts: 35
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From: Santa Clarita,Ca
2010 E550 coupe,2005 porsche ca 911,04 subaru outback,94 Harley FXSTC
Accelerator pedal is creating electrical "noise" causing traction control to put car in limited operation strategy . My coupe did this and testing system came to dead end ,then took different strategy and came up with accelerator pedal. The pedal has a throttle position sensor inside and it is the culprit .The sensor comes with pedal assy ,easy to replace works great.
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Joined: Jan 2018
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From: Atlanta GA
2012 E350 Cabriolet now SOLD to my son
if the alternative is to replace then it is worth it to go after the bad one with electrical cleaner. If it works it is a cheap fix..if it doesnt.. then you would need to replace the pedal ,,but you woulda hadda do that anyway so.... worth a shot...
Last edited by WRC-LVR; Jan 31, 2025 at 12:43 PM.
