DTC P0722 Hummer

Cause and Solution

The system tests the lock solenoid circuits by checking for unwanted voltage.The underhood fuse block supplies B+ on the battery positive voltage circuit and reads the voltage back on the lock solenoid control circuit.If the TCCM detects a low voltage return when a high voltage is expected, or a high voltage return when a low voltage is expected, the DTC is logged.The fault must remain current for 1 second to set the DTC.