U0002-CAN C BUS OFF PERFORMANCE





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    The ABM detects a CAN Bus off event.


Possible Causes
  
(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND
  
(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND
  
(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE
  
(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
  
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
  
ANTI-LOCK BRAKE MODULE
  
POWERTRAIN CONTROL MODULE
  
SHIFTER LEVER ASSEMBLY (NAG1 ONLY)
  
TRANSMISSION CONTROL MODULE (NAG1 ONLY)
  
STEERING CONTROL MODULE
  
FRONT CONTROL MODULE
  



Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION







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. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

2.ANTI-LOCK BRAKE MODULE — INTERNAL SHORT









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 Antilock Brake Module in accordance with the service information.
  • Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

3.POWERTRAIN CONTROL MODULE — INTERNAL SHORT









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 in accordance with the service information.
  • Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.

4.SHIFTER LEVER ASSEMBLY (NAG1 ONLY)— INTERNAL SHORT


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









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 in accordance with the service information.
  • Perform NAG1 TRANSMISSION VERIFICATION TEST.

5.TRANSMISSION CONTROL MODULE (NAG1 ONLY)— INTERNAL SHORT


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









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 in accordance with the service information.
  • Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

6.STEERING CONTROL MODULE — INTERNAL SHORT









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 in accordance with the service information.
  • Perform BODY VERIFICATION TEST - VER 1.

7.(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE








Is there any voltage present?

Yes
  • Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
  • Perform BODY VERIFICATION TEST - VER 1.


No
  • Go To 8

8.(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE





Is there any voltage present?

Yes
  • Repair the (D64) CAN C Bus (-) circuit for a short to voltage.
  • Perform BODY VERIFICATION TEST - VER 1.


No
  • Go To 9

9.(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND






Is any resistance present?

Yes
  • Repair the (D65) CAN C Bus (+) circuit for a short to ground.
  • Perform BODY VERIFICATION TEST - VER 1.


No

10.(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND





Is any resistance present?

Yes
  • Repair the (D64) CAN C Bus (-) circuit for a short to ground.
  • Perform BODY VERIFICATION TEST - VER 1.


No

11.(D65) CAN C BUS (+) CIRCUIT SHORTED TO (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.


No
  • Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Front Control Module in accordance with the service information.
  • Perform BODY VERIFICATION TEST - VER 1.