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Engine-Codes – GMC – B3718 GMC

B3718 GMC Code - Front Wiper Relay Drive Circuit High

Quick Answer

The B3718 GMC code indicates a problem with the Front Wiper Relay Drive Circuit being too high. Common causes include Faulty front wiper relay, Damaged wiring or connectors in the front wiper circuit, Corrosion or loose connections in the front wiper system. 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
B3718 GMC indicates Front Wiper Relay Drive Circuit High.
Common causes
Common causes include Faulty front wiper relay, Damaged wiring or connectors in the front wiper circuit, Corrosion or loose connections in the front wiper system.
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 17, 2024
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Code B3718 GMC Description

The B3718 GMC code indicates a problem with the Front Wiper Relay Drive Circuit being too high. This circuit is responsible for controlling the operation of the front windshield wipers in the vehicle. When this code is triggered, it means that the voltage in the circuit is exceeding the specified limit, which can lead to issues with the wiper system's functionality.

OBDII Code B3718 GMC - Front Wiper Relay Drive Circuit High
B3718 GMC Code - Front Wiper Relay Drive Circuit High

Common Causes of B3718 GMC

  1. Faulty front wiper relay.
  2. Damaged wiring or connectors in the front wiper circuit.
  3. Corrosion or loose connections in the front wiper system.
  4. Defective front wiper motor.
  5. Electrical issues in the vehicle's wiring system.

Symptoms of B3718 GMC

  1. Front windshield wipers not working at all.
  2. Front windshield wipers operating at an incorrect speed.
  3. Front windshield wipers stopping in the middle of their cycle.
  4. Front windshield wipers making unusual noises during operation.

How to Fix B3718 GMC

  1. Begin by inspecting the front wiper relay and replacing it if found to be faulty.
  2. Check the wiring and connectors in the front wiper circuit for any damage or corrosion, repairing or replacing as necessary.
  3. Test the front wiper motor for proper functionality and replace it if it is defective.
  4. Clear any codes stored in the vehicle's computer system and test the front windshield wipers to ensure they are operating correctly.
  5. If the issue persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix B3718 GMC

The typical repair costs for addressing the B3718 GMC code can vary depending on the specific cause of the issue. In general, replacing a front wiper relay can cost between $50 to $150, while repairing damaged wiring or connectors may range from $100 to $300. If a front wiper motor needs to be replaced, the cost can be around $150 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on location and other factors. It is advisable to consult a professional mechanic for a more accurate cost estimate based on the vehicle's make and model.

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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 B3718 GMC Code

1. What are the common symptoms of OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

The common symptoms include constant or intermittent operation of the front wipers, wipers not turning off, and potential issues with other electrical components.

2. What are the possible causes of OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

Possible causes include a faulty front wiper relay, damaged wiring or connectors in the wiper circuit, or a problem with the wiper motor itself.

3. How can I diagnose the Front Wiper Relay Drive Circuit High issue?

Diagnosis typically involves using a scan tool to read the OBDII code, inspecting the front wiper relay and related components, and testing the wiring and connectors for any faults.

4. Can I still drive my vehicle with OBDII code B3718 GMC active?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential wiper malfunction during inclement weather.

5. How can I repair OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

Repair options may include replacing the front wiper relay, repairing or replacing damaged wiring or connectors, or addressing any issues with the wiper motor.

6. Are there any DIY tips for fixing OBDII code B3718 GMC?

DIY enthusiasts with automotive repair experience may attempt to replace the front wiper relay themselves, following the vehicle's service manual or online guides.

7. Can extreme weather conditions cause OBDII code B3718 GMC to trigger?

Yes, extreme weather conditions such as heavy rain, snow, or ice can potentially exacerbate existing issues with the front wiper relay drive circuit, leading to the code being triggered.

8. How long does it typically take to repair OBDII code B3718 GMC?

The repair time can vary depending on the exact cause of the issue and the repair process involved, but it can generally be completed within a few hours to a day.

9. Will resetting the OBDII code B3718 GMC clear the issue permanently?

Resetting the code may temporarily clear it, but if the underlying issue with the front wiper relay drive circuit is not addressed, the code is likely to reappear.

10. Is it recommended to seek professional help for OBDII code B3718 GMC repair?

If you are not confident in diagnosing or repairing electrical issues in your vehicle, it is advisable to seek professional help from a certified mechanic or auto repair shop to ensure the problem is properly resolved.

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