uweschroeder4
Corsa Gear Shift Problems
Summary of the thread
A 2001 Corsa diesel is experiencing gear shift problems, including inability to engage gears, transmission slipping, grinding noises, and a dead gear selection display. These issues, along with error codes pointing to control unit problems, suggest a faulty transmission control module (TCM). The solution involves replacing the TCM, which was confirmed by a workshop and subsequently fixed.
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4 comment(s)
uweschroeder4 (community.author)
Slips in all gears. I did pull the codes; points to control unit issues. Wiring harness seems ok after a quick check. TCM – is that likely given the display's dead too?
robertcrystal16
Yeah, the dead display really points towards a central control issue. Given it's affecting both the gear engagement and the display, and the codes are suggesting it, a faulty TCM is a prime suspect. The fact that it's slipping across all gears makes it even more probable. Unfortunately, diagnosing a TCM definitively often requires specialized equipment. Based on what you've described, I'd say a trip to a trusted workshop is in order; they can run deeper diagnostics. Just brace yourself; replacement and programming of a new TCM for these older models can be pricey, around 1000€.
uweschroeder4 (community.author)
Cheers. Workshop confirmed it's the TCM. Quoted 1000€, as you guessed. Bit the bullet and got it fixed.
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VAUXHALL
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CORSA
robertcrystal16
Sounds nasty. The symptoms indicate more than just a simple sensor glitch. When you say 'slips', is it happening across all gears, or just specific ones? Have you tried pulling any diagnostic codes? An OBDII scanner might give you a better idea of where the issue is originating. Could be the transmission control module (TCM) failing, or a wiring harness issue. Any recent work done on the car before this started?