victoria_baumann1
Yaris Hybrid Transmission Issue
Summary of the thread
A 2016 Toyota Yaris Hybrid with 96,000 kilometers is experiencing unresponsive paddle shifters, a slipping gearbox, grinding noises, and a transmission error code on the dashboard. These symptoms suggest a potential issue with the Transmission Control Unit (TCU). After checking the transmission fluid level and finding it adequate, the TCU was identified as the problem. Replacing and reprogramming the TCU resolved the issues, restoring the vehicle's performance.
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4 comment(s)
victoria_baumann1 (community.author)
It's pretty consistent whether the engine is hot or cold. I haven't checked the fluid level yet. If it is the TCU, is that a big job? What's involved in replacing it?
michaellight52
Replacing the TCU isn't exactly a walk in the park. It's buried in the gearbox somewhere and might require some special tools. Plus, you'll probably need to get it programmed to your specific car. If you're seeing error codes and getting all those symptoms, and the fluid level is OK, then yeah, I'd say limp it to a workshop. Looks like you have a case of affected control unit defective. A friend had a similar issue, and the repair was around 1000€.
victoria_baumann1 (community.author)
I checked the fluid level, and it was fine. Took it to a shop. Turns out you were spot on – the TCU was toast! They replaced it and reprogrammed everything. Runs like a dream now, but it cost me about 1000€. Appreciate the help!
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TOYOTA
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YARIS
michaellight52
Sounds like a TCU issue! Does it happen all the time, or just when the engine is cold? Have you checked the transmission fluid level? Low fluid can cause some of those symptoms.