gerhard_johnson6
Citan transmission problems
Summary of the thread
A 2014 Mercedes Citan with a diesel engine is experiencing severe transmission issues, including unresponsive paddle shifters, rough shifting, and grinding noises. The vehicle has entered emergency mode, and error codes indicate a fault with the transmission control unit. The problem is suspected to be a defective transmission control module, potentially leading to a costly repair. After consulting a mechanic, the transmission control unit was confirmed as the issue, replaced, and recalibrated, resolving the transmission problems.
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4 comment(s)
gerhard_johnson6 (community.author)
Thanks for the insight! I haven't checked the wiring harness yet, but that's a good point. Where exactly is the transmission control unit located? I'll try to inspect the connections myself before taking it in, anything else I should look for?
theresamueller99
On my Renault, the control unit was tucked away near the gearbox itself, but I am unsure about Mercedes. Honestly, if you're hearing grinding noises, and the error codes point to the control module, it's probably best to get it checked by a workshop. They'll be able to diagnose it properly and confirm if it's a defective unit or something else causing the transmission problems.
gerhard_johnson6 (community.author)
Appreciate the advice. I took it to a trusted mechanic, and they confirmed it was indeed the transmission control unit. They replaced it, and after recalibrating everything, the Citan is shifting smoothly again. Cost me almost exactly 1000€, as I feared. Thanks again for your help!
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MERCEDES
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CITAN
theresamueller99
Sounds frustrating! I had similar transmission problems with my old Renault Megane a few years back. It wasn't the paddle shifters specifically, but the gearbox was behaving erratically, shifting poorly and sometimes getting stuck. The mechanic suspected a faulty car computer, specifically something related to transmission control. Did you check the wiring harness going to the transmission control unit? Sometimes a loose or corroded connection can cause these kinds of issues before you start suspecting the control module itself.