Service Information

Volt

DTC B0000

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 B0000 5A: Vehicle Speed Information Circuit Not Plausible

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Signal Terminal 20 X4	B0000 5A	B0000 5A	B0000 5A	B0000 5A

The radio receives a vehicle speed signal from the electronic brake control module (EBCM) in order to correlate actual vehicle speed to the movement of the vehicle calculated by the navigation system and reported serial data.

Conditions for Running the DTC

•

Radio ON.

•	Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

•	Vehicle speed from serial data is more than 5 km/h (3 mph) and vehicle speed pulse from the EBCM is 0 km/h (0 mph).

•	Vehicle speed calculated from the navigation processing software is more than 36 km/h (22 mph) and vehicle speed pulse from the EBCM is 0 km/h (0 mph) for 10 seconds continuously.

Action Taken When the DTC Sets

•	Turn by turn route navigation may be inoperative.

•	Vehicle indicated location may be inaccurate.

Conditions for Clearing the DTC

•	The condition responsible for setting the DTC no longer exists.

•	A history DTC clears after 100 malfunction-free ignition cycles.

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 Testing

Note: Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.

Vehicle OFF, disconnect the X4 harness connector at the A11 radio.
Vehicle ON, operate the vehicle drive wheels at 5 mph. Test for 3-7 Hertz between the signal circuit terminal 20 and ground.

⇒	If not within the specified range, test the signal circuit terminal 20 for an open, high resistance, short to ground or short to voltage. If the circuit tests normal replace the K17 EBCM.

If the circuit tests normal, replace the A11 radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio or EBCM replacement, programming and setup