2009 Pontiac G3 Q&A
2009 Pontiac G3 Question: My speedometer stopped working and the tpms light is on are they related?
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. - DaveJHM