SPEEDOMETER

1996 GMC Jimmy

Tiny

campwizard

March, 6, 2008 AT 9:31 PM

Electrical problem
1996 GMC Jimmy 6 cyl Four Wheel Drive Automatic 56000 miles

the speedometer quits working once headlamps or parking lamps are on, but it is not effected by daytime running lites. So at nite I set cruise control and it works fine but the speedometer does not move. Once you stop for 5 or 10 minutes it will then work fine for another 10 minutes then hand will remain stationary.

FOUND 1594 RELATED QUESTIONS

1 Answer

Tiny

Jack42

March, 7, 2008 AT 7:38 AM

But the cruise works when the speedo doesnt? The Speed sensor feeds info to the PCM (computer) it in turn gives a signal out to the speedo for how fast you are going. I would look for a loose/poor connection in the back of the instrument cluster. Sounds like it is losing something when the lights come on, which could be an indicator of a bad connection that cant handle any load on it

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