dart67eb

I have a 2004 ML350 and the BAS, ETS, ABS yellow and red brake lights flash and beep as soon as you turn the car on. I have the following codes: p0720, c1020, c1046, c1045, c1026, c1022.

I checked the fuses and swapped the k12 relay - no help. I pulled the connector from the ESP module and it was clean with no corrosion. The car is in limp mode. Pushing the ESP button has no effect.

I have alldatadiy but can't find any troubleshooting for chassis codes. Any help would be appreciated.

Plutoe

Whats the VIN??

dart67eb

4JGAB57E84A509293

Someone on another forum recommended that I look at the 13 pin connector on the xmsn and it was soaked. I have a new one on order and will let you know how that turns out.

Plutoe

That is correct the P0720 is a transmission fault,however all the C faults have nothing to do with the mechanical aspects of the transmission, but there is CAN(communication) fault associated with the transmission---so you got lots of things going on!!

In any event not all the C faults you pulled are cross referable to the MB C faults--they are 1045,1046 and 1026.

Fault C1020 an ESP fault relates to the coding of the ESP module;;C1022 an ESP\BAS fault relates to faulty CAN(communication with the ECU.

So after all this mumbo jumbo I agree with your replacing the connector,clearing all the faults and hopefully that solved the problem because this all sounds like communication faults!!

dart67eb

The pilot bushing came in today. Genuine MB as pictured. It was a MUCH tighter fit than the old one. cleaned everything off with brake cleaner and then contact cleaner. Started it up - no joy. Disconnected the battery and tried again - no joy. Cleaned and reinstalled the old bushing - no joy. Put the new one back in. This time I looked at the wiring going to it and saw some minor wear on the outer insulator so I cut it back to look at the wiring underneath and it didn't look bad. plugged it back in and started it up again for the heck of it and RESULT! No lights, shifted out of park. Put the scanner on it and no codes. Tomorrow, I plan to strip the outer insulation from about 6" from the plug and clean, inspect and repair as necessary. I still have the xmsn dipstick coming so once I check the fluid level, I'll test drive it.

I use an AUTEL AL619. I'm not sure if it reads xmsn codes or the xmsn codes are relayed through the ESP. Also, when I initially ran it in the ABS Event Memory function and posted the codes, the text for the following codes came up:

C1045 - Fault in CAN communication with control unit N78 (Transfer Case Control Module)
C1026 - Fault in CAN communication with control unit N15/3 (ETC [EGS] control unit)
C1022 - CAN communication with the engine system is faulty

I know these codes don't show up in the valid MB code charts listed online, but thinking two xmsn boxes went bad was hard to believe. Having me look at the xmsn connector was brilliant! Thanks again and I'll keep you posted.

marc hanna

It could be a bad wheel speed sensor. Easy fix.

dart67eb

Cleaned the wires and cannon plug. Re-wrapped and insulated. It works fine.