gertstern7

Renault Master Gearbox Slipping

My 2019 Renault Master (electric engine) is giving me grief. 118854 km on the clock. The paddle shifters are unresponsive, the gearbox is slipping and making awful grinding noises when it shifts. Sometimes it feels like forever to react when I use the paddles. Now it's stuck in emergency mode and the computer is throwing error codes. I'm guessing it's the transmission control unit, but I'm no expert!

4 comment(s)

That sounds similar to an issue I encountered with my 2016 Volvo XC90. The transmission control unit (TCU), also known as the transmission control module (TCM), manages the automatic transmission's gear selection, relying on sensor data to determine the optimal shift points. A defective TCU can cause issues like those you've described. Were there any specific error codes that you were able to retrieve? Knowing the error codes would help diagnose the root cause.

Thanks for the reply! Error codes... I'd have to check again. But you really think it's the control unit? What exactly happened with your Volvo?

Yes, in my case, the symptoms were very similar: unclean shifting, emergency mode, and ultimately a failure to shift at all. After extensive diagnosis, the workshop confirmed that the TCU was faulty and needed replacement. I suggest you consult with a trusted workshop as well. A proper diagnostic will confirm the defective control unit.

You were spot on! Took it to the shop, and after they ran diagnostics, it was indeed the transmission control unit. Quoted me 1000€ for the repair. Ouch! Thanks for the help, at least I knew what to expect.

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