Question about 2005 Pontiac Sunfire

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Speedometer and tachometer are inconsistent

The tach first stopped working, and now it appears to work sometimes and working inacurately others. Minutes after the tach stopped, the speedometer became inacurate, slowly rising and pegging out over 110mph. It now appears at 55mph with the car parked. The other gauges (fuel and temp) appear accurate so far. I'm guessing it is a sensor on the transmission but that is why I'm here, I'm no mechanic. Can I fix it?
Jim

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  • Anonymous Dec 04, 2008

    Tachometer has mind of its own

  • Anonymous Dec 31, 2008

    I have a 2005 Sunfire and the tach went haywire and stuck at about 8000 rpm in the speedo zone and blocked the speedo needle.

    Now, it is an on and off thing and will work fine for a short while and then jam in the 6000 to 7000 rpm or elsewhere.

  • cavalearr Jan 19, 2009

    Speedometer topped off at 220, stayed there, then worked its way back to zero, 20 k at a time each time I turned on the car. I't semi-works now;it's often 'sticky' or doesn't work at all. Ideas?



    I had a friend tell me it could be the small electric motor in the back. He's said it's a $600-700 dollar venture to fix, as it entails removing the whole dash.

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  • Pontiac Master
  • 15,575 Answers

Stepper motor that controls the gauge !
How to repair GM Instrument Cluster Speedometer Gauge Stepper
You can buy the step motors off amazon to do all the gauges for $27. bucks .
Amazon com Dr Roc GM Instrument Cluster Gauge Stepper Motor Repair Kit X27...

Posted on Jul 09, 2017

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Posted on Jan 02, 2017

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Anonymous

  • 1 Answer

SOURCE: 2005 pontiac sunfire

I have the same problem.. i installed a toggle switch for the fuse so at least I can reset it while driving.. its still a pain so Im thinking my next step will be to drill a hole through the plastic and put in a small metal post to stop the tach from going past 7

has anyone taken theirs into a shop?

Posted on Mar 14, 2010

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