Circuit/System Testing: C056E

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.

Program the TBCM. If DTC C056E sets after programming, perform the following steps:

If DTC C056D is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056D failed this ignition cycle, replace the TBCM.
If DTC C056E is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056E failed this ignition cycle, program the TBCM.
- If DTC C056E sets after programming, replace the TBCM.