U1367: Control Module Communication Fault

Definition

The OBD2 code U1367: Control Module Communication Fault indicates a communication issue between the vehicle's control modules, suggesting that one or more modules are not properly exchanging data

Common causes

Faulty control module
Poor or damaged wiring/connectors
Corrupted software or firmware in the control module
Low battery voltage or poor battery connections
Interference from aftermarket accessories
Faulty or damaged OBD-II port
Communication network issues (e.g., CAN bus problems)
Grounding issues in the vehicle's electrical system

Common misdiagnoses

Faulty control module
Wiring issues or shorts
Corroded connectors
Power supply problems
Software glitches or outdated firmware
Faulty sensors
Grounding issues
Intermittent communication faults
Incorrectly configured aftermarket components
Battery or charging system problems

Troubleshooting steps

1. Check for Additional Codes
2. Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context about the issue
3. Inspect Wiring and Connectors
4. Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections
5. Pay special attention to the CAN (Controller Area Network) bus wiring, as this is often where communication faults occur
6. Check Power and Ground
7. Ensure that the control modules have proper power and ground connections. Use a multimeter to verify voltage and ground continuity
8. Test Control Modules
9. If possible, test the affected control module(s) for functionality. This may involve using specialized diagnostic tools or swapping with a known good module
10. Inspect the CAN Bus
11. Use a scan tool that can monitor the CAN bus for communication. Check for any irregularities in the data being transmitted
12. Look for any short circuits or open circuits in the CAN bus wiring
13. Check for Interference
14. Ensure that there are no aftermarket devices or modifications that could be interfering with the communication between modules
15. Reset the Codes
16. After performing inspections and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
17. Consult Technical Service Bulletins (TSBs)
18. Check for any manufacturer-specific TSBs related to U1367 or communication issues. There may be known fixes or recalls that apply to your vehicle
19. Professional Diagnosis
20. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication faults. By following these steps, you should be able to identify and resolve the underlying cause of the U1367 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context about the issue

3. Inspect Wiring and Connectors

4. Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections

5. Pay special attention to the CAN (Controller Area Network) bus wiring, as this is often where communication faults occur

6. Check Power and Ground

7. Ensure that the control modules have proper power and ground connections. Use a multimeter to verify voltage and ground continuity

8. Test Control Modules

9. If possible, test the affected control module(s) for functionality. This may involve using specialized diagnostic tools or swapping with a known good module

10. Inspect the CAN Bus

11. Use a scan tool that can monitor the CAN bus for communication. Check for any irregularities in the data being transmitted

12. Look for any short circuits or open circuits in the CAN bus wiring

13. Check for Interference

14. Ensure that there are no aftermarket devices or modifications that could be interfering with the communication between modules

15. Reset the Codes

16. After performing inspections and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

17. Consult Technical Service Bulletins (TSBs)

18. Check for any manufacturer-specific TSBs related to U1367 or communication issues. There may be known fixes or recalls that apply to your vehicle

19. Professional Diagnosis

20. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication faults. By following these steps, you should be able to identify and resolve the underlying cause of the U1367 code