E-Class (W212) 2010 - 2016: E 350, E 550
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starting problem

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Old Nov 13, 2025 | 11:19 AM
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2003 CLK500, 2008 e350
starting problem

I have a 2012 e350 that seems to have a problem. When I attempt to start the car, on occasion, when I put the key in the ignition and turn it to POS 1, nothing on the dash lights up. If I continue to turn the key to the START position, the car won't start. I'll turn the key off, and my next attempt to start works fine, i.e., POS 1 lights up the dash, START position starts the car.

Has anyone else experienced this and, if you have, how was the problem solved?

Thanx for any help provided.
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Old Nov 13, 2025 | 11:03 PM
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W212 MY'14 M276-3.5NA @75kMi
unstable electrical troubleshooting

Originally Posted by rwolak
I have a 2012 e350 that seems to have a problem. When I attempt to start the car, on occasion, when I put the key in the ignition and turn it to POS 1, nothing on the dash lights up. If I continue to turn the key to the START position, the car won't start. I'll turn the key off, and my next attempt to start works fine, i.e., POS 1 lights up the dash, START position starts the car.

Has anyone else experienced this and, if you have, how was the problem solved?

Thanx for any help provided.
You're plagued with a sort of temperamental ignition key. This is not very usual. Many parts may cause this to happen on unstable CAN-B.

You should get this issue troubleshooted without coding many lucky parts (EIS, F-SAM, ....) - It may just be a cheap relay or a free reboot.

Don't fall for the most expensive item without a warranty it will resolve your issue at once.

Last edited by CaliBenzDriver; Nov 13, 2025 at 11:57 PM.
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