ABS

U0002-CAN C BUS OFF PERFORMANCE

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
The ABM detects a short in either CAN C Bus circuit.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
NOTE: If any other DTCs are present they must be repaired before continuing.

Turn the ignition on.
With the scan tool, record and erase BCM DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTCs.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- REFER TO the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. ANTILOCK BRAKE MODULE - INTERNAL SHORT
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTCs.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 3

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

3. POWERTRAIN CONTROL MODULE - INTERNAL SHORT
Turn the ignition off.
Disconnect the Powertrain Control Module C1 harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTCs.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 4

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Powertrain Control Module.
- Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test

4. SHIFTER LEVER ASSEMBLY (NAG1 ONLY)- INTERNAL SHORT
Turn the ignition off.

NOTE: If the vehicle is not equipped with a NAG1 controller then skip this step.

Disconnect the Shifter Lever Assembly harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 5

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Shifter Lever Assembly.
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test

5. TRANSMISSION CONTROL MODULE (NAG1 ONLY)- INTERNAL SHORT
Turn the ignition off.

NOTE: If the vehicle is not equipped with a NAG1 controller then skip this step.

Disconnect the Transmission Control Module C2 harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 6

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Transmission Control Module .
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test

6. STEERING ANGLE SENSOR- INTERNAL SHORT
Turn the ignition off.
Disconnect the Steering Angle Sensor harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 7

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Steering Control Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

7. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Front Control Module C1 harness connector.
Turn the ignition on.
Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.
Is there any voltage present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 8

8. (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
Measure the voltage between the (D64) CAN C Bus (-) circuit and ground.
Is there any voltage present?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to voltage.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 9

9. (D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.
Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to ground.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 10

10. (D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.
Is any resistance present?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to ground.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 11

11. (D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.
Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Front Control Module.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test