We have a 2014 VW Golf (diesel automatic) and recently we have started getting sporadic "christmas tree" errors when starting it. A few seconds after starting the engine, we get error after error reported in various systems:
- parking brake auto-hold
- cruise control
We have seen online, and had it suggested by a mechanic, that the battery may be to blame. I find this hard to understand given that the engine starts fine.
Can anyone explain why it could (even theoretically) be to blame? I can see that this is probably a daisy-chain where one sensor reports an error and this causes other systems to turn off but not why the battery would be the root cause. We're happy if it is, since the other option is an ABS pump problem, but how?