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C1104 Traction Control Active Lamp - Circuit Short to Battery

The OBD2 code C1104 indicates a fault in the traction control system where the active lamp circuit is shorted to the battery, potentially causing the traction control warning light to remain illuminated

Definition

The OBD2 code C1104 indicates a fault in the traction control system where the active lamp circuit is shorted to the battery, potentially causing the traction control warning light to remain illuminated

Common causes

  • Shorted wiring or connectors
  • Faulty traction control module
  • Malfunctioning active lamp
  • Corroded or damaged electrical connections
  • Faulty ground connection
  • Issues with the vehicle's body control module (BCM)

Common misdiagnoses

  • Faulty traction control module
  • Defective ABS module
  • Wiring issues or shorts in the harness
  • Malfunctioning brake light switch
  • Bad ground connections
  • Faulty dashboard indicator light
  • Incorrectly diagnosed wheel speed sensors
  • Issues with the power supply to the traction control system

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Inspect Battery Voltage: Ensure the battery is fully charged and in good condition. A weak battery can cause various electrical issues

  2. 2. Check Alternator Output

    Verify that the alternator is functioning properly and providing adequate voltage

  3. 3. Visual Inspection

    Inspect Wiring and Connectors: Look for damaged, frayed, or corroded wires and connectors related to the traction control system and the active lamp circuit

  4. 4. Check for Shorts

    Look for any signs of short circuits, such as exposed wires that may be touching the chassis or other components

  5. 5. Scan for Additional Codes

    Use a Diagnostic Scanner: Check for any other related trouble codes that may provide more context or indicate other issues within the traction control system

  6. 6. Test the Traction Control Active Lamp Circuit

    Check Lamp Functionality: Ensure that the traction control active lamp itself is functioning correctly. Replace it if necessary

  7. 7. Measure Voltage

    Use a multimeter to measure the voltage at the traction control active lamp circuit. Compare it to the specifications in the vehicle’s service manual

  8. 8. Inspect the Traction Control Module

    Check Connections: Ensure that the traction control module is properly connected and that there are no issues with the connectors

  9. 9. Test the Module

    If possible, test the traction control module for proper operation. This may require specialized equipment or software

  10. 10. Check for Ground Issues

    Inspect Ground Connections: Ensure that all ground connections related to the traction control system are clean, tight, and free of corrosion

  11. 11. Review Vehicle History

    Consider Recent Repairs or Modifications: If the vehicle has had recent repairs or modifications, consider whether these could have affected the traction control system

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for TSBs: Look for any manufacturer-specific TSBs related to the C1104 code or traction control issues that may provide additional guidance

  13. 13. Clear Codes and Test Drive

    Clear the Code: After performing the above checks and repairs, clear the code using a diagnostic scanner

  14. 14. Test Drive the Vehicle

    Take the vehicle for a test drive to see if the code reappears and if the traction control system operates correctly

  15. 15. Seek Professional Help

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of your vehicle. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1104 code. Always refer to the vehicle's service manual for specific procedures and specifications