Jonahx
New Member
Reaching out for help on here as I have a real headache from my 2012 C350 CDI,
Basically the problem occurs mostly when the car is left parked overnight and I go to it the following morning, when I unlock the car the interior lights do not come on, I know then that I am going to have problems. When I then get in the car and put the key in the ignition, none of the electrical systems start. So no command, no brake lights, no speedo (just the computer screen in the middle of the speedo and every warning light on)
turn the key to the 2nd notch i.e. (not starting the engine) and it starts displaying errors:-
starts with cruise control and speedtronic inoperative,
then parking guidance inoperative,
then ABS and traction control is inoperative,
then front left airbag malfunction, then front right airbag,
then restraint system malfunction,
PER-SAFE malfunction,
run flat indicators inoperative and then it cycles back through these errors.
If I start the car, it starts no problem at all, I’ve checked and the car side lights and headlights work, but the brake lights do not, so I think that is why it locks the car in park. If I remove the cover from the gear leaver, and override the park lock, I can drive the car mechanically with no problems at all, just that none of the electrical systems are on, so no powered steering no indicators, no aircon or speedo. So not safe to drive, but I drove it to the garage like that last year and it functioned through the engine and gearbox no problem.
What is really frustrating is it clears the errors and leave no trace of the problem on diagnostics. So on Sunday, it happened, I drove 3 miles to costa, locked the car had a coffee and when I came out 15 minutes later it unlocked and the car was fine, no errors or signs of any error. Also on a morning many times if I turn the key from off to the 2nd turn 3 to 5 times on the go the errors all clear and its fine. But some days I have tried for 2 hours to get it to clear and it doesn’t.
I had it at the garage they could see signs of water ingress in the front fuse box with corrosion in there, I had it replaced which was nearly £1000, it was fine for 10 days then just started again. I also have measured the car battery, when it is fine and when it isn’t and voltage wise there are no issues, tends to be 13v ish, charges at 14.5/6 when the engines on and when it errors or doesn’t error it have 12v plus in the battery (that’s the rear one in the boot, the front one I think is the stop start one and is usually 13v plus).
This happens about every 3 to 5 days and then is fine for a few days, if I unlock the car and the lights come on I know all day it will be fine, also I have never had it error when I’m driving it only when I unlock/start the car.
So help please as it is so annoying
Basically the problem occurs mostly when the car is left parked overnight and I go to it the following morning, when I unlock the car the interior lights do not come on, I know then that I am going to have problems. When I then get in the car and put the key in the ignition, none of the electrical systems start. So no command, no brake lights, no speedo (just the computer screen in the middle of the speedo and every warning light on)
turn the key to the 2nd notch i.e. (not starting the engine) and it starts displaying errors:-
starts with cruise control and speedtronic inoperative,
then parking guidance inoperative,
then ABS and traction control is inoperative,
then front left airbag malfunction, then front right airbag,
then restraint system malfunction,
PER-SAFE malfunction,
run flat indicators inoperative and then it cycles back through these errors.
If I start the car, it starts no problem at all, I’ve checked and the car side lights and headlights work, but the brake lights do not, so I think that is why it locks the car in park. If I remove the cover from the gear leaver, and override the park lock, I can drive the car mechanically with no problems at all, just that none of the electrical systems are on, so no powered steering no indicators, no aircon or speedo. So not safe to drive, but I drove it to the garage like that last year and it functioned through the engine and gearbox no problem.
What is really frustrating is it clears the errors and leave no trace of the problem on diagnostics. So on Sunday, it happened, I drove 3 miles to costa, locked the car had a coffee and when I came out 15 minutes later it unlocked and the car was fine, no errors or signs of any error. Also on a morning many times if I turn the key from off to the 2nd turn 3 to 5 times on the go the errors all clear and its fine. But some days I have tried for 2 hours to get it to clear and it doesn’t.
I had it at the garage they could see signs of water ingress in the front fuse box with corrosion in there, I had it replaced which was nearly £1000, it was fine for 10 days then just started again. I also have measured the car battery, when it is fine and when it isn’t and voltage wise there are no issues, tends to be 13v ish, charges at 14.5/6 when the engines on and when it errors or doesn’t error it have 12v plus in the battery (that’s the rear one in the boot, the front one I think is the stop start one and is usually 13v plus).
This happens about every 3 to 5 days and then is fine for a few days, if I unlock the car and the lights come on I know all day it will be fine, also I have never had it error when I’m driving it only when I unlock/start the car.
So help please as it is so annoying