Question about 2001 GMC Sonoma Extended Cab

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2002 Sonoma SLS 4.3 automatic. periodically all my gauges fluctuate wildly...tach, speedometer, fuel, oil, water temp. They will fluctuate for about 10 seconds then settle down and maybe 5 minutes later do it again. This does NOT set a check engine light. This will occur maybe 4-5 times then not do it again that day. I have about 200,000Km on the truck. Is this the ECM or what? Any help will be appreciated

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  • 4adwillis Apr 07, 2011

    I've had both the battery and alternator checked and both are OK. The problem hasn't occurred again since I got your solution The schematic you sent was too small to read and the wiring schematics in the Chilton book doesn't show the gauges voltage coming straight from +12 Volts but through the ECM. I am willing to work more with you on this but need more time for the problem to re-occur. I do have a volt meter in the gauge cluster and want to see what it does when the gauges go wonky.

    Thank you for what you've given me so far.

    Dale Willis

  • 4adwillis Apr 09, 2011

    I appreciated the expert advice. This advice makes sense and I than you. If I have further need for information I will gladly pay more for it.

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  • GMC Master
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Hi, this problem is usually caused by a fluctuation in the voltage supplied to the instrument cluster. I recommend you test your alternator. If you have a voltmeter, check the voltage at the battery with the engine running. It should not fluctuate and should be at least 14 volts. If you don't have a voltmeter, take the alternator off and have it tested at your local parts chain.

2002 Sonoma SLS 4.3 automatic. - jturcotte_1397.gif


jturcotte_1398.gif

Posted on Apr 01, 2011

  • Jeffrey Turcotte
    Jeffrey Turcotte Apr 07, 2011

    Thanks. These intermittent problems are pretty hard to solve unless they will persist long enough to run a few troubleshooting steps. If the alternator tested good, it could be a loose connection behind the cluster. See it you can coax them to act up by slapping the dash or maybe tugging the wires underneath. I'll be around.

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