91 Buick Riviera. transmission slipped, check engine light went on and speedometer quit working.

Asked by Sherry Oct 07, 2013 at 11:58 PM about the 1991 Buick Riviera

Question type: Maintenance & Repair

The tranny slipped, check engine light went on, and speedometer quit working.  Car will shift if I start in low gear and manually shift it.

3 Answers
19,575

Jason answered 11 years ago

transmission clutch pack is worn. vehicle speed sensor (vss) should be replaced. seems about right for the car's age.

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ThatDeal2013 answered 11 years ago

I would have to agree with Jason. The input speed sensor needs replacing. This malfunction will cause a number of warning lights to illuminate. Another cause could be the transmission shift solenoids have worn, causing the transmission to go in limp mode . Do not add more transmission fluid, this is a common mistake people make when transmission problems occur.

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Alvin answered 11 years ago

Whereas I had to replace transmissions in two of my Rivieras... a third one with the problems of slippery,CEL and speed odometer needle moving all over the place was solved by changing the ECM. I agree with Tennisshoes have them checked>>>SEMPER FI Good luck.

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