Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Observe the DTCs with the scan tool.
- If DTC P0602 or P062F is set, attempt to program the ECM before replacing the ECM. Refer to Service Programming System (SPS) .
- If DTC P0606 was set while performing SPS Programming, clear the DTCs and exit the diagnostic.
- If DTC P0606 was set with DTC P0851 or P0852, first go to Diagnostic Trouble Code (DTC) List - Vehicle .
Test the voltage and ground circuits to the control module for the following:
- A short
- An open
- High resistance

NOTE: DTC P2610 can be set with a loss of battery voltage to the ECM. Disconnecting the ECM with the ignition ON or an intermittent condition in the Battery Positive Voltage circuit at the underhood fuse block will set DTC P2610.

If DTC P2610 is set, turn the ignition OFF and then completely disconnect the ECM harness connector from the ECM for approximately 1 minute. Reinstall all of the ECM connectors and then clear codes with the scan tool.
- If DTC P2610 resets after code clear, test for an intermittent condition in the Battery Positive Voltage circuit at the underhood fuse block connector X2-D3.
Replace the ECM.