Having problems with your 2004 Chevrolet TrailBlazer ?
Speedodometer not working. - 2004 Chevrolet TrailBlazer
There is a cable that runs from the back of your speedometer and screws onto the transmission. It has either been cut (unlikey), pulled from the back of your speedometer or came undone from the transmission. It should be a relatively simple fix.
Repair Help & Product Troubleshooting for 2004 Chevrolet TrailBlazer
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