Problem Audi A6 2012 2.0 TDI

Hello everyone, I've been having an issue with my Audi A6 2012 2.0 TDI automatic Multitronic (8-speed) for quite some time now. I've noticed that the problem usually occurs when the outside temperature is low – basically when winter comes. It sounds strange, but every time the temperature drops, this issue appears.


The car lights up all the warning messages – ABS, ESP, tire pressure, start-stop system, transmission fault – and at that moment, the car won't start at all, not even crank. After a few attempts, it sometimes starts, or if I connect it to diagnostics and clear the errors, then it will start.


I'll send pictures so you can see – it throws practically every possible fault, which makes me think it's an electrical issue. After clearing all the errors, there are still two faults left in the engine control module that cannot be erased.


I had a similar problem before with an Audi A4 2012 2.0 TDI manual, and in that case, the issue was the alternator. On this A6, I already installed a new battery, because with the old one, whenever I jump-started the car using another battery from a different vehicle, all the faults would appear, especially in cold weather. I thought the battery was the only problem and that it was causing all the warning lights and sensor faults.


Has anyone else experienced this issue? What could the problem be? From some information I've gathered, it could possibly be a relay near the ECU.




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