Problem Description and Possible Solution
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance. Communicating these specific symptoms to your technician can save diagnostic time.
Average mileage: 98,653 (61,000–150,000)
17 people reported this problem
I had this exact issue with the crankshaft. Car fails to start when the motor gets warm or weather is really hot (car left in the sun). Engine starts when its cool. My mechanic found the fix, you would need a new crankshaft position sensor, make sure you get OEM or BOSCH, do not get a cheap fix or the issue will reoccur. I had the replacement done at an independent shop, dealer wanted $700! I got it done for $400 including parts and labor. Make sure the mechanic is trustworthy and is able to reset the ECU and tune it back. So far after 6 months the car has not failed to crank. However, I am still having issues with gear getting stuck without error codes. Might be the solenoid, will get it checked soon.
As a result of the crankshalf and camshalf sensor code, i was advise that my balance shaft needs to be replaced costing an estimated 6k. this is horrible. no recall has been issued and Mercedes is at fault due to poor engineering.
background: no problem with car 2007 C230 sport. wake up one morning, shift was in reverse and dome light was on. had tried to crank once before i knew it was in reverse.
Tried cranking again. will turn over but not fire up.
have towed to MB dealer.
they run diagnostic. state that fuel pump is bad. tell me it will be 1790 to replace. i read this forum and decide i will do it.
order both parts from partsgeek. install . car still wont fire up. new pump doesnt have the two lead plug it now has 4 leads going into unit into new 4 pin connector. so that male plug is not used. I reassempled old pump and sending unit and plugged the left over plug into the old top thinking maybe a needed to complete a circuit. and the old pump ran well.
so it seems to me that its not the fuel pump or sending unit. the #4 fuse is fine and i swapped out the 20A relay and its all still the same.
what could cause a bad fuel pump on diagnostic and yet not be the fuel pump? do i need to get a dead end plug for the old pump 4 pin connector thats not used now?
I to cant get OBD to clear or read codes. i have to actually tyake my car to the emissions center every month becuiase i cant get rid of check engine light.
i do have a thermostat stuck open and this is causing a crankshaft position sensor fals reading ( learned from another forum page) but dealer says to9 fix that is $3600.
not sure if i have a crank sensor code or not.
OBD reports crankshaft position sensor error. Engine will die and if on the road will start itself with all the seatbelt and other lights you see when first starting up and the the check engine light will come on. There will be 2 errors on the dash, speedtronic, drive to workshop and ESP please visit workshop. This happens even if the cruise control is not being used. If it dies at a stop it will be very hard to start requiring depressing the gas pedal and cranking for some time.
No notice in engine performance difference. However, this marks the first time the engine light came on and it was coded with P0016 (Crank sensor not aligned with the Cam sensor). Seriously considering trading in this car before the problems domino.