Chevrolet Trax: DTC C0242 OR P0856: Traction control malfunction/traction control orque
request signal
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
DTC C0242 00
Engine Control Module Indicated Traction Control Malfunction
DTC P0856
Traction Control Torque Request Signal Message Counter Incorrect
Circuit/System Description
When traction control is active, the electronic brake control module sends a
serial data message to the engine
control module requesting torque reduction. When certain engine control module
DTCs are set, the engine
control module will not be able to perform the torque reduction for traction
control. A serial data message is
sent to the electronic brake control module indicating that traction control is
not allowed.
Conditions for Running the DTC
Engine running
Conditions for Setting the DTC
The engine control module detects a fault that prevents it from performing a
traction control function and sends
a serial data message to the electronic brake control module indicating that
torque reduction is not allowed.
Action Taken When the DTC Sets
- The traction/stability control indicator turns ON.
- The electronic brake control module disables the traction control and
the stability control for the duration
of the ignition cycle.
Conditions for Clearing the DTC
- The DTC clears when the diagnostic runs and passes.
- The history DTC will clear after 40 consecutive fault-free ignition
cycles have occurred.
Reference Information
Schematic Reference
Antilock Brake System Schematics(Encore), Antilock Brake System
Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - (Trax)
Description and Operation
ABS Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify that no other DTCs are set except for C0242 or P0856.
If any other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
If no other DTCs are set
- Replace the K20 Engine Control Module.
- Verify that DTC C0242 or P0856 does not set while operating the vehicle
within the Conditions for
Running the DTC.
If DTC C0242 or P0856 is set
Replace the K17 Electronic Brake Control Module.
If DTC C0242 or P0856 is not set
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for Electronic Brake Control Module or Engine Control
Module replacement,
programming and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Use the air vents in the center and
on the side of the instrument panel
to direct the airflow. Move the slats
on the center air vents to direct
airflow.
Turn the knobs on the side air vents
counterclockwise or clockwise to
open or close off the airflow.
Operation Tips
Clear away any ice, snow,
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault