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hannah_storm1
C6 Gearbox Problems
4 comment(s)
hannah_storm1 (Author)
Thanks! I did a quick visual inspection of the wiring, but nothing obvious. I'll take a closer look, though. The fault codes specifically point to the TCU itself. Wouldn't a wiring issue throw a different code?
heinzwalter2
True, usually a wiring issue throws a different code. But on my Volvo, the ECU reported internal errors, and it seemed like it needed immediate replacement. Turns out, it was just a bad ground connection. Still, if it's pointing directly at the TCU, you might need a new one. Get a proper diagnostic at a shop before replacing parts.
hannah_storm1 (Author)
Thanks! I'll get a more in-depth diagnosis at the shop, but I suspect you're right, it's going to be the TCU. They quoted around 1000€ for the repair, which seems right.
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heinzwalter2
Sounds familiar. I had similar symptoms on my old Volvo V70: shifting issues, emergency mode. There was also some weirdness with the electronic systems. Have you checked the wiring harness and connections to the control unit? It could be corrosion or a loose connection. What fault codes are you getting?