friedrich_schmid70
Fiat 124 TCU Failure
Summary of the thread
The conversation centers around a suspected transmission control unit (TCU) failure in a 2020 Fiat 124 with symptoms including non-responsive paddle shifters, gearbox slipping, grinding noises, slow paddle response, emergency mode, and a stored error code. The likely cause is identified as an internal failure of the TCU. The suggested solution is to have the TCU replaced, which was confirmed by a workshop.
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4 comment(s)
friedrich_schmid70 (community.author)
Fluid level is fine, no visible leaks. Fluid condition looks ok, no burnt smell. Serviced 30000km ago. Anything else I should check before condemning the TCU?
ellaschwarz5
Okay, those basics are covered. Given the error code and multiple symptoms, it really does sound like the TCU itself. With those symptoms, it's likely an internal failure. Probably best to get it to a workshop.
friedrich_schmid70 (community.author)
Yep, figured as much. Workshop confirmed TCU failure. Quoted 1000€ for replacement. Thanks for the sanity check.
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FIAT
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124
ellaschwarz5
Grinding noises and slipping? That sounds rough. Have you checked the basics, like fluid level and condition? When was the last service?