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speedometer acting up

Discussion in 'Chevy C/K Truck Forum' started by K15 Blazer Guy, Jul 9, 2013.

  1. K15 Blazer Guy

    K15 Blazer Guy Member 2 Years 100 Posts

    speedometer acting up on the truck. the tach, and everything else seams to be happy, but the speedo cant make up its mind some times.
    I don't think its a speed sensor because when the truck is stopped, it reads zero... but, when I stand on the brakes it jumps up to 10mph...

    extra voltage load is affecting the speed needle... any idea how to fix this?
    ive checked for codes, there are none
    ive reset the computer several times

    it is starting and driving just fine, it just cant give me accurate readings all of a sudden.
    anyone else have this issue on an OBD 1 truck?

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