Question about 1994 GMC Jimmy

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Will not shift auto but will manual ,and speedometer quit working

All this happen at the same time. 1994 gmc jimmy 4.3 v-6

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  • w_fowler Jan 25, 2009

    I fixed the problem it was the speed control mod


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There are two things I would look at. First and least expensive is the neutral safety switch. It controls the shifting functions as far as PRNDL2L1. The other thing to check is the large bundle of wires that go into the passenger side of the transmission. Make sure it is in and seated.
If your check engine light is on and it is showing codes for the transmission, also check the ignition switch. They go out as well. The symptoms appear as starting out in 3rd gear with reverse ok or a touch of chatter.
Hope thi helps.
RPM Northwest

Posted on Jan 22, 2009

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