achim_wilson1
Seat Leon Diesel Gearbox Issues
Summary of the thread
A 2003 Seat Leon diesel is experiencing significant gearbox issues, including unresponsive paddle shifters, slipping gears, grinding noises, and emergency mode activation. The problem is suspected to be related to the transmission control unit, as indicated by error codes. The suggested solution is to have the transmission control unit checked and potentially replaced by a professional mechanic, as confirmed by another individual who faced a similar issue.
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4 comment(s)
achim_wilson1 (community.author)
Thanks for the quick reply! Yeah, I did check the error codes, and it points towards the transmission control unit being defective. You mentioned a similar issue, was it definitely the control module in your case? And did you manage to fix it yourself, or did you take it to a workshop?
fionadark10
Yep, for me, it was 100% the control module. Tried everything else first – fluid change, checked the wiring. Ended up being the car computer itself. I wouldn't recommend tackling a transmission repair like that yourself unless you're seriously confident. You'll need specialized tools and diagnostic equipment. Best bet is to take it to a trusted mechanic who knows their way around car computers.
achim_wilson1 (community.author)
Thanks a lot for your help! I took it to a local mechanic, and it was indeed the transmission control unit. They replaced it, and it cost me around 1000€. Ouch! But at least my Leon is running smoothly again.
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SEAT
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LEON
fionadark10
Sounds like a dodgy transmission control unit to me. I had a similar issue with my Leon, although it's a newer model. Symptoms were almost identical: slipping gears, emergency mode, the works. Have you checked the error codes with an OBD2 scanner? That's the first thing I'd recommend. It could also be low transmission fluid, but given the grinding noises, I'm leaning towards the car computer being the culprit. Transmission problems are never fun!