Chevrolet Trax: DTC C1207, C1208, C1221, C1222, C1225, C1226, C1232, OR C1233: Front wheel speed sensor

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 C1207 00

Left Front Wheel Speed Sensor Circuit High Input

DTC C1208 00

Right Front Wheel Speed Sensor Circuit High Input

DTC C1221 00

Left Front Wheel Speed Sensor Circuit

DTC C1222 00

Right Front Wheel Speed Sensor Circuit

DTC C1225 00

Left Front Wheel Speed Sensor Circuit Performance

DTC C1226 00

Right Front Wheel Speed Sensor Circuit Performance

DTC C1232 00

Left Front Wheel Speed Sensor Circuit Low Input

DTC C1233 00

Right Front Wheel Speed Sensor Circuit Low Input

Circuit/System Description

Each wheel speed sensor receives ignition voltage through the signal high circuit from the electronic brake control module. Wheel speeds are detected by active wheel speed sensors and encoder rings. The magnetic encoder rings consists of multiple north and south pole pairs surrounding the outer circumference. When the encoder ring rotates and passes by the wheel speed sensor; it generates a sign wave in the wheel speed sensor.

The sensor converts the signal to a digital square wave; the square wave values switch between 7mA (Low) and 14mA (High) DC current. As the wheel spins, the module uses the frequency of the square wave signal to calculate the wheel speeds.

Conditions for Running the DTC

Vehicle speed is greater than 12.9 km/h (8 MPH).

Conditions for Setting the DTC

A supervised periodic message indicates the wheel speed serial data has not been received.

Action Taken When the DTC Sets

• The traction/stability control indicator turns ON.
• The electric brake control module disables the traction control, the stability control and the hill start assist 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 drive 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

1. Verify DTC C0035, C0040, C0045, or C0050 is not set.

If any of the DTCs are set

Refer to DTC C0035, C0040, C0045, or C0050.

If none of the DTCs are set

2. Replace the K17 Electronic Brake Control Module.
3. Verify DTC C1207, C1208, C1221, C1222, C1225, C1226, C1232, or C1233 does not set while operating the vehicle within the Conditions for Running the DTC.

If any of the DTCs are set

Replace the module that set the DTC.

If none of the DTCs are set

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Electronic Brake Control Module or module replacement, programming and setup

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