Question about 1990 Chevrolet C1500

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Speedo not working

I have a 90 1500 4x4 silverado and the speedo doesn't work. I have changed the speed sensor and the cluster and no change.

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  • rebelrauserj Jul 14, 2009

    is there a difference between the 4x4 and 4x2 ECU?

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  • Chevrolet Master
  • 2,359 Answers

With the engine off,and ground battery terminal off.

Use an ohm meter the trace the VSS connector back to the ECU.

It should be the same color code.

Follow the wire and look for cut(s) along the way.




Posted on Jul 14, 2009

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  • Chevrolet Master
  • 1,348 Answers

Change the ecu,the main computer with a good used one.it is located behind the glovebox

Posted on Jul 14, 2009

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1 Answer

05 elantra 2.0 auto speedo dont work replaced all 3 sensors and body to eng grd is my cluster bad or drive gear bad help please how do i replace drive gear in trans help


If i may ask why did change the sensor,did it show the the ABS light on the cluster?You need to perfom a cluster self diagnosis am not sure of the procedure on Hyundai since i am a Nissan Tech or perfom active test on the cluster,if not check the fuses.Back to sensors if you had an ABS light before and it cleared but still no Speedo then you might have bought wrong sensors,the ABS module can tell that there is a sensor due to resistance but as you drive it can't pick up your speed signal to the ECM

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is the odometer dead too. (we need that answer now)

there are 3 class evolutionary systems.
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so lets do that. we login to alldata.com and look , so can you at any time,
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Code P0500 Speedometer doesn't work on my Toyota Tundra


Hi Coritter, Depending on the year of manufacture of your vehicle, the speed control could be related to the ABS pickup sensors mounted on the wheels. Modern vehicles manufactures tend to double up on functions and therefore a fault seemingly unrelated can be. Have a full scan carried out. If you drive a manual shift you could be lucky, because on an auto box the same speed sensors control the gear change. Regards John

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I have a 1997 buick le sabre with only 70k original miles... the speedometer works intermitently... now less and less... do I need to replace the whole instrument cluster? or is it a loose wire?? any...


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1 Answer

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Is the speed sensor that you are using the original one, or is it from the Camaro, or is it new for an 89 K1500?

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1 Answer

Speedo not working


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Jun 20, 2009 | 1999 Chevrolet Venture

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