WOMS
B code body Medium severity

B2519 High Mount Stop Lamp Circuit Failure

The OBD2 code B2519 indicates a malfunction in the high mount stop lamp circuit, which may involve issues with the wiring, bulb, or the control module related to the high mount brake light

Definition

The OBD2 code B2519 indicates a malfunction in the high mount stop lamp circuit, which may involve issues with the wiring, bulb, or the control module related to the high mount brake light

Common causes

  • Faulty high mount stop lamp bulb
  • Damaged wiring or connectors
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Faulty stop lamp switch
  • Corroded terminals
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty brake light switch
  • Wiring issues or shorts in the circuit
  • Defective high mount stop lamp
  • Malfunctioning body control module (BCM)
  • Issues with the vehicle's electrical system
  • Faulty fuses or relays
  • Problems with the main brake light circuit

Troubleshooting steps

  1. 1. Visual Inspection

    Check the High Mount Stop Lamp: Inspect the high mount stop lamp for any physical damage or burnt-out bulbs. Replace the bulb if necessary

  2. 2. Wiring and Connectors

    Examine the wiring and connectors leading to the high mount stop lamp for signs of damage, corrosion, or loose connections

  3. 3. Check Fuses

    Locate the fuse box and check for any blown fuses related to the brake lights or high mount stop lamp. Replace any blown fuses

  4. 4. Test the High Mount Stop Lamp

    Use a multimeter to check for voltage at the high mount stop lamp connector when the brake pedal is pressed. If there is no voltage, the issue may be upstream in the circuit

  5. 5. Inspect the Brake Light Switch

    The brake light switch is responsible for sending the signal to the high mount stop lamp. Check the switch for proper operation. If the switch is faulty, it may need to be adjusted or replaced

  6. 6. Check for Ground Issues

    Ensure that the high mount stop lamp has a good ground connection. A poor ground can cause the lamp to malfunction. Use a multimeter to test the ground connection

  7. 7. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  8. 8. Inspect the Body Control Module (BCM)

    If all other components check out, the issue may lie within the BCM, which controls the high mount stop lamp. Check for any software updates or faults in the BCM

  9. 9. Wiring Diagram Reference

    Refer to the vehicle’s wiring diagram to trace the circuit and identify any other components that may be involved in the high mount stop lamp circuit

  10. 10. Consult Repair Manual

    If necessary, consult the vehicle’s repair manual for specific troubleshooting procedures related to the high mount stop lamp circuit

  11. 11. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue causing the B2519 code