Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, observe the DTC information with a scan tool. DTC C056D and DTC C056E, should not set.

If DTC C056D failed this ignition, replace the TBCM.

If DTC C056E failed this ignition, program the TBCM.