The speedometer may stop functioning with code P0722 stored in the powertrain control module (PCM). This may be caused by a worn speedometer gear due to coolant contamination of the transmission fluid. If contamination is found the radiator is most likely at fault. The transmission should also be thoroughly inspected and repaired or replaced as required.
Pontiac G3 Problem Reports
Most Reported Pontiac G3 Problem Reports
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A Loose or worn gas cap may cause Check Engine Light to illuminate.