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S212 350CDI 4matic 2009 didn't suddenly start

JohnPond

New Member
Joined
Jun 26, 2022
Messages
3
Location
Finland
Car
S212 350CDI 4Matic 2009
My car didn't start this morning. The following texts appeared on the dashboard:
fault.jpg
fault2.jpg
fault3.jpg
And see there isn't glow light as it shoud be.

I have Icarsoft as my obd reader, and it says the following fault codes for the ESP module

630700 Status: current. There is an internal fault in the control module "Engine Electronics".
630A00 Status: power. There is an internal fault in the control module "Engine Electronics".
631000 Status: power. There is an internal fault in the control module 'Engine electronics'.

I cleared the fault codes, but they came back immediately. I was able to watch live data but that didn't help as the car didn't start.

No fault codes from the ECU. No fault codes from the EZS/EIS.

When I turned the ignition key, the glow light did not come on and the transfer pump did not make any sound. I removed and charged the battery, no effect. Tried with another key after charging and installing the battery, no effect.

The fault code reader said the following information about the EZS/EIS module.

20250301-174257.jpg


Finally, I tried alternately with two different keys, when after ten or more tries the glow light came on and the transfer pump made noise, the car started without any problem. After that the car ran and those instrument cluster texts disappeared, both keys worked repeatedly.
EZS/EIS said the following after the car finally started

20250301-174521.jpg




Error messages, no glow light, no noise from transfer pump, no start, error codes from the ESP-module.

Recharged battery, still same problems. Tried two differents keys, don't help. Switched between those two keys and tried to start.EZS/EIS "Start enable for control module ME is issued" is No.
After ten or more tries everything is working. EZS/EIS "Start enable for control module ME is issued" is YES and those messages from the odometer are gone.

Is the ignition lock broken, ECU broken or what is wrong? EZS/EIS was fixed 2-3 years ago, when it suddenly changed from the D to the P on slow speed.
 
The problems came back this morning with two new error codes and previous codes are still on. Yesterday I was able to drive car couple minutes without any problems or error codes.
ISM-CAN
U010029 State: Current. Communication with the engine control module has a malfunction. There is an invalid signal.
U010031 State: Current. Communication with the engine control module has a malfunction. The signal is not present.

I can get in ISM and read live data without problem though.

Could it be faulty ECU/ECM?

I could't get in EPS electric power steering (N68) -module even though ignition switch is ON.

I'll get Star to read the codes on Monday, hopefully.
 

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