Question about 2004 GMC Envoy

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Speedometer About 3 wks. ago my speedo started jumping in 1 mph increments instead of smooth motion. A couple of days ago I was going about 60 mph and speedo was showing 20 mph. Since then it is always showing 10 to 15 mph faster or slower than I am really going. Thanks for any help you can give me.

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The speedo is electronic and has failed, you will need to have it repaired by an authorized GM repair shop that does GM electronics, this is not the dealer, they will send it out and charge 2X, send it out for repair yourself, bypass the dealer.

Posted on Oct 27, 2008

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Stock Tire - 215/60R16 >Search Tires Tire 1 - 205/60R16 >Search Tires Section Width: 8.46 in 215 mm Section Width: 8.07 in 205 mm Rim Diameter: 16 in 406.4 mm Rim Diameter: 16 in 406.4 mm Rim Width Range: 5.5 - 8.5 in Rim Width Range: 5.5 - 7.5 in Overall Diameter: 26.15 in 664.21 mm Overall Diameter: 25.68 in 652.27 mm Sidewall Height: 5.07 in 128.77 mm Sidewall Height: 4.84 in 122.93 mm Radius: 13.07 in 331.97 mm Radius: 12.84 in 326.13 mm Circumference: 82.15 in 2086.6 mm Circumference: 80.67 in 2049.0 mm Revs per Mile: 795.4 Revs per Mile: 809.9 Actual Speed: 60 mph 100 km/h Speedometer1: 61.0 mph 101. km/h Speedometer Difference: - Speedometer Difference: 1.822% too fast Diameter Difference: - Diameter Difference: 1.8%

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