Diagnostic Instructions
DTC Descriptor
DTC C0561 71: ECM Indicated TCS Malfunction
DTC P0856: TCS Inhibited
Circuit/System Description
The electronic brake control module (EBCM) disables the traction control when other electronic control modules set DTCs for components that effect the operation of the traction control system.
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | Ignition voltage is greater than 9.5 volts. |
Conditions for Setting the DTC
The powertrain control module (PCM) or body control module (BCM) diagnose a condition preventing the engine traction control and sends a serial data message to the EBCM indicating that torque reduction is not allowed. The PCM or BCM will typically set
a DTC and the EBCM will set this DTC.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The EBCM disables the engine traction system (ETS) for the entire ignition cycle. |
| • | The traction Off Indicator turns ON. |
| • | The antilock brake system (ABS) remains functional. |
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
This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS. The ECM should be checked for a possible fault.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Electrical Information Reference
Circuit/System Verification
Verify that no DTCs are set in the ECM.
