My beloved a6 has had a major tantrum

[James.c]

Driving home yesterday and it just started going mental. First gearbox light said I can carry on driving. Then traction control and glow plug light then about a million others on and off managed to get home lost drive a few times. Plugged in the obdeleven and got these.

I have a video going through all the fault codes but it takes a while!

Anyone know what’s going on? And if there is any local specialists to North Yorkshire


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[AlS3BE]

check for faulty battery. Had something similar with one of my c7’s when the battery went faulty. Flagging a shedload of random fault codes.

 

[James.c]

I’ve seen things about a relay 645 under the ecu they can cause problems too


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[NHN]

Yeah has to be power supply, check relays, fuses for anything not pushed fully home or bad conduction from build up on contact's.

 

[James.c]

Put a new battery on and most of the codes have gone apart from p189300
Signal wire for gear display in selector lever


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[James.c]

Turned out to be water in the plug on the mechatronics unit all fixed


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[Adrian1871]

water in the mechatronics plug ?? thought that was sealed inside sump with oil?

 

[James.c]

water in the mechatronics plug ?? thought that was sealed inside sump with oil?

The coolant solenoid on the gearbox leaks and it travels down to the big plug below, proper *****


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