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Engine-Codes – Generic – B1873

B1873 Code - Turn Signal / Hazard Power Feed Circuit Short To Ground

Quick Answer

The diagnostic trouble code B1873 indicates a problem with the turn signal/hazard power feed circuit being shorted to ground. Common causes include Damaged or frayed wiring in the turn signal/hazard power feed circuit, Corrosion in the electrical connections within the circuit, Faulty turn signal or hazard light switch. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1873 indicates Turn Signal / Hazard Power Feed Circuit Short To Ground.
Common causes
Common causes include Damaged or frayed wiring in the turn signal/hazard power feed circuit, Corrosion in the electrical connections within the circuit, Faulty turn signal or hazard light switch.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B1873 Description

The diagnostic trouble code B1873 indicates a problem with the turn signal/hazard power feed circuit being shorted to ground. In simpler terms, this means that there is an unintended connection between the power supply and the ground in the circuit that controls the turn signals and hazard lights in the vehicle. This issue can lead to various electrical malfunctions in the vehicle's lighting system, affecting the proper functioning of the turn signals and hazard lights.

OBDII Code B1873 - Turn Signal / Hazard Power Feed Circuit Short To Ground
B1873 Code - Turn Signal / Hazard Power Feed Circuit Short To Ground

Common Causes of B1873

  1. Damaged or frayed wiring in the turn signal/hazard power feed circuit.
  2. Corrosion in the electrical connections within the circuit.
  3. Faulty turn signal or hazard light switch.
  4. Short circuit in the turn signal or hazard light system.
  5. Defective relay controlling the turn signal or hazard lights.

Symptoms of B1873

  1. Turn signals and hazard lights not working properly or not functioning at all.
  2. Rapid blinking of turn signals.
  3. Dim or flickering turn signal or hazard light indicators on the dashboard.
  4. Blown fuses related to the turn signal or hazard light circuit.
  5. Electrical burning smell or smoke coming from the turn signal or hazard light components.

How to Fix B1873

  1. Begin by visually inspecting the wiring and connections in the turn signal/hazard power feed circuit to identify any visible damage or corrosion. Repair or replace any damaged components.
  2. Use a multimeter to test the continuity and voltage levels in the circuit to pinpoint the location of the short to ground. Repair or replace any faulty components as needed.
  3. Check the turn signal and hazard light switch for proper functionality. Replace the switch if it is found to be defective.
  4. Inspect the relay that controls the turn signal and hazard lights. Replace the relay if it is malfunctioning.
  5. Clear the diagnostic trouble code from the vehicle's onboard computer system using a scan tool after completing the repairs to reset the system.

Cost to Fix B1873

The cost of repairing a turn signal/hazard power feed circuit short to ground can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the parts required for this repair, such as wiring, switches, and relays, can range from $50 to $200. Additionally, labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total cost of repairing this issue could range from $150 to $500 or more, including parts and labor. It is advisable to consult with a professional mechanic to get a more accurate estimate based on the specific circumstances of your vehicle.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1873 Code

1. What are the common symptoms of OBDII code B1873 (Turn Signal / Hazard Power Feed Circuit Short To Ground)?

- Common symptoms include non-functioning turn signals or hazards, flashing rapidly, or no response when using the turn signal or hazard switch.

2. What are the typical causes of OBDII code B1873?

- The code B1873 is usually caused by a short to ground in the power feed circuit of the turn signal or hazard system, which can be due to damaged wiring, faulty connections, or a malfunctioning component.

3. How can I diagnose the issue related to OBDII code B1873?

- To diagnose the issue, you can perform a visual inspection of the wiring and connectors, test the turn signal and hazard components for proper function, and use a multimeter to check for continuity and shorts in the circuit.

4. Can I still drive my vehicle with OBDII code B1873?

- It is not recommended to drive the vehicle with OBDII code B1873 as non-functioning turn signals or hazards can pose a safety hazard on the road. It is best to address the issue promptly.

5. How can I repair OBDII code B1873?

- Repairing OBDII code B1873 involves identifying and fixing the short to ground in the power feed circuit. This may require repairing or replacing damaged wiring, connectors, or components in the turn signal or hazard system.

6. Are there any DIY tips for fixing OBDII code B1873?

- While diagnosing and repairing electrical issues can be challenging, DIY enthusiasts with experience in automotive electrical systems can attempt to trace the short to ground and make necessary repairs. However, professional assistance is recommended for accurate diagnosis and safe repairs.

7. Do I need special tools to fix OBDII code B1873?

- Basic tools such as a multimeter, wire strippers, electrical tape, and a soldering iron may be needed to diagnose and repair OBDII code B1873. Specialized diagnostic tools may also be helpful in pinpointing the exact location of the short to ground.

8. Can weather conditions affect OBDII code B1873?

- Extreme weather conditions, such as moisture or corrosion, can contribute to electrical issues like a short to ground in the turn signal or hazard power feed circuit, leading to OBDII code B1873. Ensuring proper weatherproofing can help prevent such issues.

9. Will resetting the OBDII code B1873 clear the problem?

- Resetting the OBDII code B1873 may temporarily clear the error code, but if the underlying issue causing the short to ground is not addressed, the problem is likely to return. It is essential to diagnose and repair the root cause of the code.

10. How can I prevent OBDII code B1873 from occurring in the future?

- Regularly inspecting and maintaining the electrical components of the turn signal and hazard system, ensuring proper weatherproofing, and addressing any wiring or connection issues promptly can help prevent OBDII code B1873 from occurring in the future.

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