Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Program the ESC module twice before replacement and cycle the ignition off and on to see if the DTC C0551 resets.
The replacement ESC module must be programmed when replacement is necessary. If the ESC module is not programmed after replacement, DTC C0551 is stored in the ESC module memory and will not clear until the module is programmed.