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.
