U0001-CAN C BUS CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The FCM detects a short in either CAN C Bus circuit.
| 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 |
| ANTILOCK BRAKE MODULE |
| POWERTRAIN CONTROL MODULE |
| SHIFT LEVER ASSEMBLY |
| STEERING CONTROL MODULE |
| FINAL DRIVE CONTROL MODULE |
| ENGINE CONTROL MODULE (DIESEL ONLY) |
| TRANSMISSION CONTROL MODULE (3.7L/DIESEL ONLY) |
| FRONT CONTROL MODULE |
Diagnostic Test
1.TEST FOR INTERMITTENT CONDITIONDoes the scan tool display U0001–CAN C BUS CIRCUIT 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.
2.ANTILOCK BRAKE MODULE — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT 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 — VER 1.
3.POWERTRAIN CONTROL MODULE — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT 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.SHIFT LEVER ASSEMBLY (IF EQUIPPED) — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
- Go To 5
No
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Shift Lever Assembly in accordance with the service information.
- Perform VERIFICATION TEST VER 1.
5.STEERING CONTROL MODULE — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
- Go To 6
No
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Steering Control Module in accordance with the service information.
- Perform VERIFICATION TEST VER - 1.
6.FINAL DRIVE CONTROL MODULE (IF EQUIPPED)— INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
- Go To 7
No
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Final Drive Control Module in accordance with the service information.
- Perform FDCM VERIFICATION TEST VER - 1.
7.ENGINE CONTROL MODULE (DIESEL ONLY) — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
- Go To 8
No
- 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.
- Perform POWERTRAIN VERIFICATION TEST VER - 1.
8.TRANSMISSION CONTROL MODULE (3.7L/DIESEL ONLY) — INTERNAL SHORT
NOTE: Answer yes if the vehicle is not equipped with this module.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
- Go To 9
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 TRANSMISSION VERIFICATION TEST VER.
9.(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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 10
10.(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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 11
11.(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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 12
12.(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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 13
13.(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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).