AutoCodes – GMC – B3875 2018 GMC Sierra

B3875 2018 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 2018 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 198

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 2018 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 2018 GMC Sierra - Windshield Wiper High Speed Relay Circuit - AutoCodes.com — B3875 2018 GMC Sierra Code - Windshield Wiper High Speed Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3875 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the B3875 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3875 2018 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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B3875 in a 2018 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit?

The common symptoms include the high-speed wiper function not working properly, wipers operating at inconsistent speeds, or the wipers not working at all.

2. What are the possible causes of OBDII code B3875 in a 2018 GMC Sierra?

Possible causes include a faulty high-speed wiper relay, damaged wiring or connectors in the circuit, a malfunctioning wiper motor, or a problem with the wiper control module.

3. How can I diagnose the Windshield Wiper High Speed Relay Circuit issue in my 2018 GMC Sierra?

A thorough diagnostic process involves checking the high-speed wiper relay, inspecting the wiring and connectors for damage, testing the wiper motor, and scanning the vehicle's computer for specific error codes.

4. Can I repair the Windshield Wiper High Speed Relay Circuit issue in my 2018 GMC Sierra at home?

While some basic troubleshooting like checking fuses and relays can be done at home, diagnosing and repairing complex electrical issues may require professional assistance to ensure proper repair and safety.

5. Are there any quick tips for fixing OBDII code B3875 in a 2018 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit?

Quick tips include checking the wiper fuse first, inspecting the relay for signs of damage, ensuring all connections are secure, and consulting the vehicle's manual for specific troubleshooting steps.

6. Is it safe to continue driving my 2018 GMC Sierra with OBDII code B3875 related to the Windshield Wiper High Speed Relay Circuit issue?

It is not recommended to drive the vehicle in heavy rain or adverse weather conditions without properly functioning windshield wipers. Addressing the issue promptly will ensure safe driving conditions.

7. How much does it typically cost to repair OBDII code B3875 in a 2018 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit?

The cost of repair can vary depending on the exact cause of the issue, labor rates, and parts needed. It is advisable to get a few quotes from reputable repair shops for an accurate estimate.

8. Can a DIY enthusiast with basic automotive skills fix the Windshield Wiper High Speed Relay Circuit issue causing OBDII code B3875 in a 2018 GMC Sierra?

While some aspects of the repair may be within reach for a DIY enthusiast, troubleshooting and repairing electrical issues can be complex. It is best to assess your skills and comfort level before attempting the repair.

9. Are there any recalls or service bulletins related to OBDII code B3875 in a 2018 GMC Sierra for the Windshield Wiper High Speed Relay Circuit issue?

It is advisable to check with a GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or service bulletins related to this specific OBDII code in your vehicle.

10. Will resetting the OBDII system clear the B3875 code related to the Windshield Wiper High Speed Relay Circuit in a 2018 GMC Sierra?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem to prevent recurring codes.