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Q: My speedometer stopped working and the tpms light is on are they related? on 2009 Pontiac G3

I have checked the tire pressure and the tpms light will not go off. Also, the check engine light is on. Are these things related? What type if speedometer system does my car have?
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For tire pressure - have you checked the spare tire too? It must maintain proper pressure and is measured for the TPMS system to prove out.

The speedometer stopped working very likely due to a speed sensor problem. This has probably caused the check engine light to come on. Not sure though -- a diagnostic test will have to be performed.
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