Lexus GS Hybrid TCM Issue

My 2013 Lexus GS hybrid (33929 km) sometimes won't start, the CEL is on, and shifts are jerky. The code reader says something's up with the parking position. Could a defective control unit be the culprit?

4 comment(s)

I had a similar issue on my Lexus GS. Does it feel like it's not fully engaging into park? It could be the gear linkage acting up. Check the error memory for any transmission related fault codes. It might be a simple adjustment, but could also be the TCM.

TCM? Is that the transmission control module? Where is that located and how difficult is it to replace? And by adjustment, do you mean the gear linkage?

Yes, TCM is the Transmission Control Module. The TCM is often integrated within the transmission. Given the symptoms – engine won't start, shifting issues, and the error code – it's more than likely a faulty TCM. The 'adjustment' I was referring to is indeed the gear linkage. Given the complexity, I'd suggest getting it checked by a workshop.

Roger that. Shop confirmed the TCM issue and quoted 1000€ for the repair. Thanks for the confirmation.

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