PRE-RELEASE
DTC C0252
| DTC C0252 |
| 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 C0252 00
Vehicle Stability Control Module Sensors Correlation Malfunction
| Circuit/System Description |
The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, external to the electronic brake control module (EBCM). The EBCM controls the stability control by monitoring the inputs of the yaw rate sensor, lateral acceleration sensor, and steering angle sensor. The readings are compared to an internal calibrated value so it knows if the vehicle is having an instability condition to activate the stability control.
| Conditions for Running the DTC |
Vehicle is travelling.
| Conditions for Setting the DTC |
The yaw rate sensor, lateral acceleration sensor and steering angle sensor signals are not plausible to each other. Straight line driving can not be recognized after a distance of 2.5 km (1.5 mi).
| Action Taken When the DTC Sets |
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The EBCM disables the stability control and hill start assist 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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| Diagnostic Aids |
The following conditions can cause this concern:
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Improper steering alignment
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An improperly mounted or loose multi-axis acceleration sensor
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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 Verification |
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Ignition ON, observe the scan tool Lateral Acceleration Signal and Yaw Rate Sensor parameter. On a level surface, the readings should be 0 V.
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Observe the scan tool Steering Column Position parameter. As the steering wheel is turned, the reading should travel from -450 to +450°.
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| Circuit/System Testing |
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Verify that DTC C0187, C0196, C019B, C0297, or C0710 is not present.
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| 2. |
If any listed DTC is present, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
.
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| 3. |
Replace the B119 Multi-axis Acceleration Sensor and verify the DTC does not reset.
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| 4. |
If the DTC resets, replace the B99 Steering Wheel Angle Sensor and verify the DTC does not reset.
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| 5. |
If the DTC resets, replace the K17 Electronic Brake Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement
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Steering Wheel Position Sensor Replacement
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Control Module References
for EBCM replacement, setup and programming
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