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B3873 2016 GMC Sierra Code - Front Washer Relay Circuit

Quick Answer

The B3873 diagnostic trouble code (DTC) indicates an issue with the front washer relay circuit in a 2016 GMC Sierra. Common causes include Faulty front washer relay, Damaged wiring or connectors in the front washer relay circuit, Blown fuse related to the front washer 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
B3873 2016 GMC Sierra indicates Front Washer Relay Circuit.
Common causes
Common causes include Faulty front washer relay, Damaged wiring or connectors in the front washer relay circuit, Blown fuse related to the front washer 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 11, 2024
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Code B3873 2016 GMC Sierra Description

The B3873 diagnostic trouble code (DTC) indicates an issue with the front washer relay circuit in a 2016 GMC Sierra. The front washer relay circuit is responsible for controlling the operation of the front windshield washer system. When this code appears, it means that there is a malfunction in the circuit that is preventing the front washer system from functioning properly.

OBDII Code B3873 2016 GMC Sierra - Front Washer Relay Circuit
B3873 2016 GMC Sierra Code - Front Washer Relay Circuit

Common Causes of B3873 2016 GMC Sierra

  1. Faulty front washer relay.
  2. Damaged wiring or connectors in the front washer relay circuit.
  3. Blown fuse related to the front washer system.
  4. Malfunctioning front washer pump.
  5. Corrosion or rust affecting the components in the front washer system.

Symptoms of B3873 2016 GMC Sierra

  1. Front windshield washer not spraying fluid.
  2. Front windshield wipers not working in conjunction with the washer.
  3. No noise or sound of the washer pump when trying to use the front washer system.
  4. Front washer system only working intermittently or erratically.

How to Fix B3873 2016 GMC Sierra

  1. Begin by diagnosing the issue by using a scan tool to read the B3873 DTC and pinpoint the exact cause of the problem.
  2. Check the front washer relay and replace it if it is faulty.
  3. Inspect the wiring and connectors in the front washer relay circuit for any damage or corrosion, repairing or replacing them as needed.
  4. Test the front washer pump to ensure it is functioning correctly, replacing it if necessary.
  5. Clear the DTC from the vehicle's computer system and test the front washer system to confirm that the issue has been resolved.

Cost to Fix B3873 2016 GMC Sierra

The typical repair costs for resolving a front washer relay circuit issue can vary depending on the specific cause of the problem and the cost of parts and labor. In general, replacing a front washer relay can cost between $50 and $150, while addressing wiring or connector issues may range from $100 to $300. If the front washer pump needs to be replaced, the cost can be around $50 to $200. Labor rates at auto repair shops can vary, but on average, expect to pay between $80 and $150 per hour for diagnosis and repairs. Additional costs may apply for diagnostic time and any other necessary parts or services. It is recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for B3873 2016 GMC Sierra

B3873:01 Front Washer Relay Circuit Short to Battery

B3873:02 Front Washer Relay Circuit Short to Ground

B3873:04 Front Washer Relay Circuit Open

Need more information about the B3873 2016 GMC Sierra code?

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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 B3873 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B3873 in a 2016 GMC Sierra related to the Front Washer Relay Circuit?

The common symptoms include the front windshield washer not spraying fluid, no sound coming from the washer pump when activated, or the washer pump continuously running.

2. What are some possible causes of OBDII code B3873 in a 2016 GMC Sierra?

Possible causes of this code may include a faulty front washer pump, a malfunctioning front washer relay, damaged wiring or connectors in the front washer circuit, or a defective washer switch.

3. How can I diagnose the Front Washer Relay Circuit issue in my 2016 GMC Sierra?

You can start by checking the front washer fuse, testing the front washer pump for proper operation, inspecting the wiring and connectors for any damage, and verifying the functionality of the front washer relay.

4. What are some repair tips for resolving OBDII code B3873 in a 2016 GMC Sierra?

Some repair tips include replacing the front washer pump if it is faulty, testing and replacing the front washer relay if needed, repairing any damaged wiring or connectors, and ensuring proper operation of the washer switch.

5. Can a DIY enthusiast fix the Front Washer Relay Circuit issue associated with OBDII code B3873 in a 2016 GMC Sierra?

Depending on one's skill level and experience with automotive repairs, a DIY enthusiast may be able to address this issue by following the vehicle's service manual, using appropriate tools, and being cautious with electrical components.

6. Is it safe to continue driving my 2016 GMC Sierra with OBDII code B3873 related to the Front Washer Relay Circuit?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the front washer system when needed.

7. How much does it typically cost to repair OBDII code B3873 in a 2016 GMC Sierra at a professional auto repair shop?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor, including diagnostic fees.

8. Can a malfunctioning Front Washer Relay Circuit affect other systems in a 2016 GMC Sierra?

While the Front Washer Relay Circuit issue primarily impacts the front washer system, it may also cause issues with related components such as the windshield wipers or the washer fluid level sensor.

9. Are there any preventive maintenance steps to avoid encountering OBDII code B3873 in a 2016 GMC Sierra in the future?

Regularly checking the washer fluid level, ensuring the washer system is functioning correctly, and addressing any minor issues promptly can help prevent the occurrence of this code in the future.

10. How long does it typically take to repair OBDII code B3873 related to the Front Washer Relay Circuit in a 2016 GMC Sierra?

The repair time can vary based on the specific diagnosis and repair needed, but it may take anywhere from 1 to 3 hours to address this issue, depending on the complexity of the repair.

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