Cobalt 2006-2008, G5 2007
Malfunction Indicator Light
Proper operation of the Malfunction Indicator Lamp (MIL):
The MIL will illuminate with the ignition switch ON and the engine OFF
The MIL will turn OFF when the engine is started
The MIL will remain ON if the self-diagnostic system has detected a malfunction
The MIL may turn OFF if the malfunction is no longer present
If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated as long as the ignition switch is ON
If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON
Resetting the MIL:
If the error symptoms causing the MIL to illuminate have been corrected, the MIL will return to normal operation.
The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic system runs and does not fail
A current Diagnostic Trouble Code (DTC) clears when the diagnostic cycle runs and passes
There may still be a history of DTC-s stored in the system. These will clear after 40 consecutive warm-up cycles, if no failures are reported by any other related diagnostic system
Manual resetting of the MIL and any DTC stored in the system, requires the use of an OBD2 scan tool connected to the data link connector for communication with the vehicle. Follow the instructions of the scan tool for both retrieval and resetting of DTC-s.