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.Google+
Car Problem Reports
Pontiac G3 Speedometer Not Working and/or Code P0722 Stored in PCM
Pontiac G3 Problem
Model Years Affected: 2009, 2010
.... had to replace radiator (not covered) and transmission! over 60k miles this failure voids the power train warranty on the transmission, and is all out of pocket
the speedometer is not working, nor the odometer. A few months ago I had transmission contamination, but got it fixed. My tpms is also acting strange.