Question about 1999 Chevrolet Silverado 1500

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I disconnected the battery on my 1999 chevy silverado and when I reconnected the power the speedometer is pegged out at 100 mph. everthing else on the dash and all other items seem to work fine. no other problems ?????????

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Turn the ign switch to run position and disconnect battery and reconnect

Posted on Oct 24, 2010

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Well you know it does not have a speedo cable since you replaced the speed sensor in the transmission.
My guess would be a problem with the speedo or cluster.

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Speedometer is pegged out at 100 and won't work


Hi,
Likely one of your Speed Sensors (VSS) is bad. Sorry I don't know WHERE these are located, but get on some of the Chevy Truck forums for answers.

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Cluster is bad. Call your dealership with the vin and mileage and ask if the special policy applies to your truck. You may have to pay a little, but it will be cheaper than paying for the whole thing.

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The stepping motors in the gauge go bad, but uusually they fail gradually, or just one, The dealer charges $300 to fix, do a search on ebay for CHEVY SILVERADO INSTRUMENT CLUSTER for cheaper repair options. gauges are powered by the pcm, no fuses inbetween, so if it runs ok, problem is in cluster

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If you have an autozone in your area, take it there. Ask them to plug in the obd unit and diagnose your issue. They can give you a printout of what the issue the obd is seeing, can sell you parts, and even show you how to replace whatever.

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My check gauges light came on and my gas gauge, temp gauge, speedometer and of course odometer are not working.


Mine has done this a few times after having disconnected the battery for service. Disconnecting and reconnecting the battery a second time brought them back. A mechanic friend told me it hase something to do with the ECM relearning after having been disconnected. Hope this helps.

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IMHO, I think that the broken cable is what is causing the problems. It "confuses" the programing of the CPU or computer.

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Speedometer


The stepping motors in the gauges go bad. do a search on ebay for CHEVY SILVERADO INSTRUMENT CLUSTER for cheaper repair options. The dealer charges around $300.00. It will continue to worsen.

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