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Engine-Codes – GMC – B3875 2015 GMC Sierra

B3875 2015 GMC Sierra Code - Windshield Wiper High Speed Relay Circuit

Quick Answer

The B3875 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Windshield Wiper High Speed Relay Circuit. Common causes include Faulty high-speed relay, Damaged wiring or connectors in the relay circuit, Corrosion or loose connections in the circuit. 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
B3875 2015 GMC Sierra indicates Windshield Wiper High Speed Relay Circuit.
Common causes
Common causes include Faulty high-speed relay, Damaged wiring or connectors in the relay circuit, Corrosion or loose connections in the circuit.
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 18, 2024
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Code B3875 2015 GMC Sierra Description

The B3875 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Windshield Wiper High Speed Relay Circuit. This code indicates a problem with the circuit that controls the high-speed function of the windshield wipers. The windshield wiper system in a vehicle is crucial for maintaining visibility during inclement weather conditions, and any issues with the high-speed relay circuit can affect the wipers' performance.

OBDII Code B3875 2015 GMC Sierra - Windshield Wiper High Speed Relay Circuit
B3875 2015 GMC Sierra Code - Windshield Wiper High Speed Relay Circuit

Common Causes of B3875 2015 GMC Sierra

  1. Faulty high-speed relay
  2. Damaged wiring or connectors in the relay circuit
  3. Corrosion or loose connections in the circuit
  4. Defective wiper motor
  5. Issues with the PCM or control module

Symptoms of B3875 2015 GMC Sierra

  1. Wipers not operating at high speed
  2. Wipers only working at low or intermittent speeds
  3. Wipers not responding to speed control settings
  4. Wipers stopping suddenly during operation
  5. Wipers operating erratically or inconsistently

How to Fix B3875 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the windshield wiper system, focusing on the high-speed relay circuit.
  2. Test the high-speed relay for proper functionality using a multimeter.
  3. Check the wiring and connectors for any signs of damage, corrosion, or loose connections.
  4. If the high-speed relay is faulty, replace it with a new one that is compatible with the vehicle's make and model.
  5. Clear the DTC from the PCM using a diagnostic scan tool and test the windshield wipers to ensure they are operating correctly.

Cost to Fix B3875 2015 GMC Sierra

The typical repair costs for addressing the B3875 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for a windshield wiper high-speed relay circuit problem can range from $150 to $300, including parts and labor. However, it's important to note that prices may vary based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. Additionally, diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour. It's recommended to obtain quotes from local repair shops to get a more accurate estimate for this repair.

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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 B3875 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3875 (Windshield Wiper High Speed Relay Circuit) in a 2015 GMC Sierra?

The common symptoms include the windshield wipers not working on the high-speed setting, wipers getting stuck or moving erratically at high speed, or the wipers only working on low speed.

2. What are the possible causes of OBDII code B3875 in a 2015 GMC Sierra?

Possible causes include a faulty high-speed relay, a damaged wiper motor, corroded electrical connections, or a malfunctioning wiper switch.

3. How can I diagnose the Windshield Wiper High Speed Relay Circuit issue in my 2015 GMC Sierra?

Start by checking the high-speed wiper relay for proper functioning, inspect the wiper motor for any damage, test the wiper switch for continuity, and examine the electrical connections for corrosion or loose wires.

4. Can a DIY enthusiast repair the Windshield Wiper High Speed Relay Circuit issue in a 2015 GMC Sierra?

Depending on your skill level and access to tools, you may be able to replace a faulty high-speed relay or wiper motor yourself. However, complex electrical issues might require professional diagnosis and repair.

5. Are there any safety concerns associated with OBDII code B3875 in a 2015 GMC Sierra?

Yes, driving with malfunctioning windshield wipers can reduce visibility during inclement weather, posing a safety risk. It is important to address the issue promptly to ensure safe driving conditions.

6. How much does it typically cost to repair the Windshield Wiper High Speed Relay Circuit issue in a 2015 GMC Sierra?

The cost of repairs can vary depending on the exact cause of the issue, the labor rates in your area, and whether you choose OEM or aftermarket parts. It's advisable to get multiple quotes from reputable mechanics.

7. Can OBDII code B3875 in a 2015 GMC Sierra cause other electrical problems in the vehicle?

While the code specifically relates to the windshield wiper high-speed relay circuit, electrical issues in one part of the vehicle can sometimes lead to problems in other systems. It's best to address any electrical concerns promptly.

8. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B3875 present?

If your windshield wipers are not functioning properly, especially on high speed, it is not safe to drive in rainy or snowy conditions. It is recommended to address the issue before driving the vehicle.

9. How long does it usually take to repair the Windshield Wiper High Speed Relay Circuit issue in a 2015 GMC Sierra?

The repair time can vary based on the exact problem, availability of parts, and the mechanic's experience. Simple repairs may take a couple of hours, while more complex issues could require a day or more.

10. Can extreme weather conditions affect the occurrence of OBDII code B3875 in a 2015 GMC Sierra?

Extreme weather conditions, such as heavy rain, snow, or exposure to harsh sunlight, can potentially accelerate wear and tear on the windshield wiper components, leading to issues like the Windshield Wiper High Speed Relay Circuit fault. Regular maintenance can help mitigate these effects.

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