Service Information

Volt

DTC C005A

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 Descriptor

DTC C005A 00: Simultaneous Malfunction of Both Wheel Speed Sensors on One Axle Malfunction

The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives ignition voltage from the electronic brake control module and provides an alternating current square wave signal to the electronic brake control module. As the wheel spins, the module uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

•	Vehicle in Service Mode or Vehicle ON

•	Ignition voltage is greater than 10 V.

•	Two wheel speeds are greater than 5 km/h (3 MPH).

Conditions for Setting the DTC

Simultaneous dropout of both wheel speed sensors on the same axle.

Actions Taken when the DTC Sets

•	The ABS indicator turns ON.

•	The red brake indicator turns ON.

•	The traction control/stability control indicator turns ON.

•	The Service Brake Assist and Service StabiliTrak messages are displayed on the driver information centre.

•	The electronic brake control module disables the antilock brake system, the dynamic rear proportioning, the traction control system and the electronic stability program for the duration of the drive cycle.

Conditions for Clearing the DTC

•	The condition for setting the DTC is no longer present.

•	The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

Reference Information

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

Vehicle in Service Mode.
Verify that DTC C005A is not set.

⇒	*If the DTC is set*

Refer to DTC C0035-C0050, C1207-C1210, C1221-C1228, or C1232-C1235 .

⇓	*If the DTC is not set*

All OK.