I am getting the "check engine" light, and the codes are telling me the speed sensor is not responding. The speedo in my car is for some reason a 140 KMH speedo (My car is a canadian 1987 GT, it should have a 180 kmh speedo) It hasnt really worked 2 years, since I got it, but just recently, it completely stopped working.

Any ideas? DO i just need a new speedo? Or is there something else that I check?

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87 GT w/T-Tops
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Stuck at 20. You could check and see if you are getting power to it Yellow wire. It sounds like you are talking about the dash because it stays at 20. Sounds like the speedo is not getting power or ground. Bad curcut?? I would start with the dash.

Cool, thanks! I will check that out.

Speedos are Air Core Meters, which means that as soon as they loose power, they will be "stuck" at whatever position they are at that time.

So in short, it's probably in your dash. If the VSS wasn't sending any pulses (and the speedo was still working), the speedo would read zero.

To remove the dash unit, remove the following screws/bolts:

Four torx at the front
Three torx on top
Two torx at the back
Four small hex at the bottom sides,
Two small hex at the bottom

Remove top and bottom. Then remove:

Two small hex at the front
Two large hex at the back (not all dashes have those two)
Two large hex at the bottom

Now pull the dash towards you. Remove the cable at the bottom and the two cables at the back. Now you should be able to remove the dash unit.

Check the print wires at the back of the unit and check all connections where the cables were seated. If all looks fine, open the dash and replace speedo (in the dash, not your swimming pants).

Hello everyone. Check your fuses..really. One of them feeds the speedometer but surprisingly it isn't labeled as such.

Cheers, dman