WOMS
U code network Medium severity

U0136 Lost Communication With Differential Control Module Rear

The OBD2 code U0136 indicates a loss of communication between the vehicle's main control module and the rear differential control module, which may affect the operation of the rear differential system

Definition

The OBD2 code U0136 indicates a loss of communication between the vehicle's main control module and the rear differential control module, which may affect the operation of the rear differential system

Common causes

  • Faulty differential control module
  • Damaged wiring or connectors
  • Poor ground connection
  • Corroded connectors
  • Faulty communication network (CAN bus issues)
  • Blown fuse
  • Software or firmware issues in the control module
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty Differential Control Module
  • Wiring issues or damaged connectors
  • Faulty ABS module
  • Faulty Engine Control Module (ECM)
  • Faulty Transmission Control Module (TCM)
  • Battery or power supply issues
  • Faulty wheel speed sensors
  • Incorrectly programmed or updated software
  • Grounding issues
  • Faulty CAN bus communication lines

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the differential control module for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or pushed back

  4. 4. Test the Differential Control Module

    If accessible, test the differential control module for proper operation. This may involve checking power and ground connections to the module

  5. 5. Use a multimeter to verify that the module is receiving the correct voltage and ground

  6. 6. Check Communication Lines

    Inspect the CAN (Controller Area Network) bus lines for continuity and integrity. A break or short in the communication lines can lead to communication issues

  7. 7. Use a scan tool to monitor the data bus for any irregularities

  8. 8. Perform a Network Scan

    Use a professional-grade scan tool to perform a network scan. This can help identify if other modules are having communication issues, which may affect the differential control module

  9. 9. Check for Software Updates

    Verify if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix communication issues

  10. 10. Inspect Related Components

    Check other components that may be related to the differential control module, such as the transfer case control module or any other modules that communicate with it

  11. 11. Clear Codes and Test Drive

    After performing inspections and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle make and model.Conclusion Troubleshooting OBD-II code U0136 involves a systematic approach to identify and resolve communication issues with the differential control module. By following these steps, you can narrow down the potential causes and take appropriate action to fix the problem