PRE-RELEASE
DTC C0242 or P0856
| DTC C0242 or P0856 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC C0242 00
Powertrain Control Module Indicated Traction Control Malfunction
DTC P0856 00
Traction Control Torque Request Circuit Malfunction
| Circuit/System Description |
When traction control is active, the electronic brake control module (EBCM) sends a serial data message to the engine control module (ECM) requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.
| Conditions for Running the DTC |
Engine Running
| Conditions for Setting the DTC |
The ECM detects a fault that prevents it from performing a traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed.
| Action Taken When the DTC Sets |
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The EBCM disables the traction control and stability control for the duration of the ignition cycle.
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The traction control/stability control-active indicator turns ON.
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| Conditions for Clearing the DTC |
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A current DTC clears when the diagnostic runs and passes.
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The EBCM will turn OFF the indicator in the next ignition cycle.
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| Reference Information |
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Verify that no DTCs except P0856 00 are present in the K20 Engine Control Module (ECM).
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| 2. |
If any DTC is present, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
.
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| 3. |
Replace the K20 Engine Control Module (ECM) and verify the DTC does not reset.
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| 4. |
If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).
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| Repair Instructions |
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Perform the
Diagnostic Repair Verification
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Control Module References
for EBCM or ECM replacement, programming and setup
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