Question:
2004 gmc pickup speedometer shows zero and abs light and servivce brake lights on trani shifts goofy like truck is not getting road speed signal
Answer:
All these problems are related to not getting a signal from the vehicle speed sensor. The proper way to test this is with the use of a scan tool,checking for codes and reading the sensor outputs to the trucks computer. I will send you a picture showing the sensor location,it is #4 in the illustration, you can check to see it the wiring to it is intact. The sensor is held on by one bolt,and easy to replace. It cost approx. 25.00. But replacing it with out the testing is a gamble.
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