WOMS
U code network Medium severity

U0183 Lost Communication With Rear Lighting Control Module

The OBD2 code U0183 indicates a loss of communication between the vehicle's main control module and the rear lighting control module, which may affect the operation of rear lights

Definition

The OBD2 code U0183 indicates a loss of communication between the vehicle's main control module and the rear lighting control module, which may affect the operation of rear lights

Common causes

  • Faulty rear lighting control module
  • Damaged wiring or connectors
  • Corroded connectors
  • Short circuit in the wiring
  • Open circuit in the wiring
  • Faulty body control module
  • Software issues or glitches
  • Poor ground connection

Common misdiagnoses

  • Faulty rear lighting control module
  • Wiring issues or shorts in the harness
  • Faulty body control module (BCM)
  • Blown fuses
  • Corroded connectors
  • Software or programming issues
  • Faulty sensors related to lighting
  • Issues with the vehicle's CAN bus system

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 leading to the Rear Lighting Control Module (RLCM) 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 Rear Lighting Control Module

    If accessible, test the RLCM for proper operation. This may involve checking for power and ground at the module

  5. 5. Use a multimeter to measure voltage and ground at the module's connector

  6. 6. Check Power and Ground

    Verify that the RLCM is receiving the correct voltage and has a good ground connection. Refer to the vehicle’s wiring diagram for the correct pin locations and specifications

  7. 7. Inspect Related Components

    Check other components that may be connected to the RLCM, such as rear lights, switches, and any associated modules. A fault in these components can sometimes cause communication issues

  8. 8. Perform a Network Scan

    Use a scan tool capable of performing a network scan to check for communication issues between modules. This can help identify if the problem is isolated to the RLCM or if other modules are affected

  9. 9. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the manufacturer for any available updates for the vehicle’s control modules

  10. 10. Clear Codes and Test Drive

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

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U0183 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. They may have specialized tools and knowledge to address complex communication issues. By following these steps, you should be able to identify the cause of the U0183 code and take appropriate action to resolve the communication issue with the Rear Lighting Control Module