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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Anti-Lock Brake System & Adjustable Pedals - Electrical Diagnostics) >> Electrical Diagnostics >> Abs >> DTC Troubleshooting >> U0002-Can C Bus Off Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. TEST FOR INTERMITTENT CONDITION 

    Turn the ignition on.

    With the scan tool, record and erase TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  2.

    No 

    1. 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.
  2. ANTI-LOCK BRAKE MODULE - INTERNAL SHORT 

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Turn the ignition on.

    With the scan tool, record and erase TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  3.

    No 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Anti-Lock Brake Module in accordance with the service information.
    2. Perform 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 TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes, with Floor Shift 

    1. Go To  4.

    Yes, with Column Shift 

    1. Go To  5.

    No 

    1. 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.
    2. Perform *PCM 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 TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  6.

    No 

    1. 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.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  5. ELECTRONIC SHIFT MODULE (COLUMN NAG1)- INTERNAL SHORT 

    Turn the ignition off.

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

    Disconnect the Electronic Shift Module harness connector.

    Turn the ignition on.

    With the scan tool, record and erase TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  6.

    No 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Electronic Shift Module in accordance with the service information.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  6. 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 TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  7.

    No 

    1. 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.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  7. ENGINE CONTROL MODULE (DIESEL)- INTERNAL SHORT 

    Turn the ignition off.

    Disconnect the Engine Control Module C2 harness connector.

    Turn the ignition on.

    With the scan tool, record and erase TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  8.

    No 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Engine Control Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  8. STEERING CONTROL MODULE - INTERNAL SHORT 

    Turn the ignition off.

    Remove the Steering Control Module.

    Turn the ignition on.

    With the scan tool, record and erase TIPM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active TIPM DTC's.

    Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active? 

    Yes 

    1. Go To  9.

    No 

    1. 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.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  9. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage Between (D65) CAN C Bus (+) Circuit & Ground
    GC0070062Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Totally Integrated Power 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 

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

    No 

    1. Go To  10.
  10. (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage Between (D64) CAN C Bus (-) Circuit & Ground
    GC0070063Courtesy of CHRYSLER LLC

    Measure the voltage between the (D64) CAN C Bus (-) circuit and ground.

    Is there any voltage present? 

    Yes 

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

    No 

    1. Go To  11.
  11. (D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND 
    Fig 3: Measuring Resistance Between Ground & (D65) CAN C Bus (+) Circuit
    GC0070064Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.

    Is any resistance present? 

    Yes 

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

    No 

    1. Go To  12.
  12. (D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND 
    Fig 4: Measuring Resistance Between Ground & (D64) CAN C Bus (-) Circuit
    GC0070065Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.

    Is any resistance present? 

    Yes 

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

    No 

    1. Go To  13.
  13. (D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT 
    Fig 5: Measuring Resistance Between (D65) CAN C Bus (+) Circuit & (D64) CAN C Bus (-) Circuit
    GC0070066Courtesy of CHRYSLER LLC

    Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.

    Is any resistance present? 

    Yes 

    1. Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Totally Integrated Power Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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