Antilock Brakes / Traction Control Systems

DTC C0550
Circuit Description
The Electronic Brake Control Module (EBCM) detects an internal malfunction or loss of ground.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0550 Electronic Control Unit Performance

Conditions for Running the DTC
The ignition switch is in the ON position.

Conditions for Setting the DTC
^ An internal EBCM malfunction exists.
^ System voltage is less than half the ignition voltage continuously for 0.04 seconds.

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The ABS/ACC/DRP/EDC/IVC/TPM/VES/VSES are disabled.
^ TCS is degraded.
^ The ABS/TCS indicators turn ON.
^ The red BRAKE Warning indicator turns ON.

The DIC displays the following:
^ Service ABS
^ Service Traction System
^ Service Stabilitrak
^ Service Radar Cruise

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
Possible causes of this DTC:
^ Open ground at the EBCM
^ Internal malfunction in the EBCM

Test Description
The number below refer to the step number on the diagnostic table.
2. Tests for a proper ground to the EBCM.