W220 S65 - Fails to start / No Crank / Nothing
Keyless go and manual key produce the same results. It cuts the power to most accessories like it usually does right before start but the never cranks.
For some reason ESP, ABS, BAS and Display Defective messages come up on the cluster after trying this 3-5 times.
Cluster reads 11.7V
Took the battery out for about an hour but the results are the same.
I don't have SDS handy to read the codes.
Any ideas?

Aaron
Fuse 87 was blown which prevented the relay from powering up the ECU, ESP and ignition system. I replaced the fuse but it would blow every time I clicked from ACC to ON position. This prevented the car from attempting to crank the motor.
I checked with SDS and the car said it had no communication with the ECU.
I thought the ECU was fried and was causing this so I unplugged it and replaced the fuse, it again was blown out.
I disconnected the voltage regulator/transformer for the coil packs and replaced the fuse and everything worked and the relay clicked on.
Mercedes wanted a $850 for the voltage transformer but I had a new one shipped up for a lot less than that.
I will install it tomorrow and confirm that it was the issue. Thank you for all the suggestions!
Trending Topics
I have to say the car now starts easier, idles smoother and the power curve is insane. What a ****ing animal! The throttle response also seems to be improved greatly.
I guess that old converter was on it's way out... I wanted to blame the coil packs.
Listen to this exhaust note...
The Best of Mercedes & AMG




If my friend didn't hook me up with the part, this would be $850.00




My car did not have symptoms like yours. My CEL goes on and I run codes p0304-6 and -p0307-9. Feels like a coil pack problem but it isn't. Car cranks, electronics work but once the motor starts running it dies within 5 seconds. I leave it to rest for 10-15 minutes and the car starts up fine. Happens once a month if I'm lucky. Did you experience this before total lost and zero crank?
My car did not have symptoms like yours. My CEL goes on and I run codes p0304-6 and -p0307-9. Feels like a coil pack problem but it isn't. Car cranks, electronics work but once the motor starts running it dies within 5 seconds. I leave it to rest for 10-15 minutes and the car starts up fine. Happens once a month if I'm lucky. Did you experience this before total lost and zero crank?







