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 (ECU) 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 EBCM malfunction |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Test both of the ground circuits of the electronic brake control module (EBCM) for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 3 | |
3 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
4 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 2 | System OK |
