AutoCodes – GMC – B3875 2015 GMC Sierra

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

Quick Answer

The windshield wiper motor is controlled by the Body Control Module (BCM) through the windshield wiper replay and the windshield wiper speed control relay. Common causes include Faulty Windshield Wiper Relay, Windshield Wiper Relay harness is open or shorted, Windshield Wiper Relay circuit poor electrical connection. 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 Windshield Wiper Relay, Windshield Wiper Relay harness is open or shorted, Windshield Wiper Relay circuit poor electrical connection.
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.

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Code Popularity 249

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3875 2015 GMC Sierra Description

The windshield wiper motor is controlled by the Body Control Module (BCM) through the windshield wiper replay and the windshield wiper speed control relay. When low speed windshield wiper operation is requested, the BCM will apply voltage to the windshield wiper relay control circuit. This will cause the contacts in the windshield wiper relay to close and apply B+ to the windshield wiper motor through the windshield wiper low speed control circuit, enabling low speed wiper operation. When high speed windshield wiper operation is requested, the body control module continues to apply voltage to the windshield wiper relay control circuit and also applies ground to the windshield wiper speed control relay control circuit. This will cause the contacts in the windshield wiper speed control relay to close and apply B+ to the windshield wiper motor through the windshield wiper high speed control circuit, enabling high speed wiper operation. When the windshield wiper request is no longer present, the contacts in the windshield wiper relay and windshield wiper speed control relay will open, removing B+ from the wiper motor control circuits. The windshield wiper motor will continue to operate using a discrete B+ circuit provided by the BCM until the wipers are in the park position.

OBDII Code B3875 2015 GMC Sierra - Windshield Wiper High Speed Relay Circuit - AutoCodes.com — B3875 2015 GMC Sierra Code - Windshield Wiper High Speed Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3875 2015 GMC Sierra?

Faulty Windshield Wiper Relay
Windshield Wiper Relay harness is open or shorted
Windshield Wiper Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3875 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3875 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B3875 2015 GMC Sierra code?

Need more information on how to fix the B3875 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3875 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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.