AutoCodes – GMC – B3875 GMC

B3875 GMC 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 GMC 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 2,032

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

What does this mean?

What are the Possible Causes of the DTC B3875 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

B3875 2014 GMC Sierra — Windshield Wiper High Speed Relay Circuit
B3875 2015 GMC Sierra — Windshield Wiper High Speed Relay Circuit
B3875 2016 GMC Sierra — Windshield Wiper High Speed Relay Circuit
B3875 2017 GMC Sierra — Windshield Wiper High Speed Relay Circuit
B3875 2018 GMC Sierra — Windshield Wiper High Speed Relay Circuit

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 GMC Code

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

Symptoms may include the windshield wipers operating only at one speed, usually the high-speed setting, or the wipers not working at all.

2. What are the possible causes of OBDII code B3875 GMC?

Potential causes include a faulty high-speed wiper relay, damaged wiring or connectors in the wiper circuit, or a malfunctioning wiper motor.

3. How can I diagnose the Windshield Wiper High Speed Relay Circuit issue?

You can use a multimeter to test the high-speed wiper relay for continuity and proper operation. Additionally, inspect the wiring and connectors for any visible damage or corrosion.

4. Can a DIY enthusiast repair OBDII code B3875 GMC?

Repairing this code may be possible for those with automotive repair experience. Replacing the high-speed wiper relay or fixing wiring issues are common repair tasks associated with this code.

5. Is it safe to drive with OBDII code B3875 GMC active?

Driving with this code may not pose an immediate safety risk, but it is recommended to address the issue promptly to ensure proper windshield wiper functionality, especially in inclement weather.

6. How do I reset OBDII code B3875 GMC after making repairs?

Once you have fixed the underlying issue causing the code, you can reset it using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the fault code.

7. Are there any preventative maintenance tips to avoid OBDII code B3875 GMC in the future?

Regularly inspecting the windshield wiper system, checking the condition of the relays, and keeping the wiper circuitry clean and free of debris can help prevent issues leading to this OBDII code.

8. Can extreme weather conditions contribute to triggering OBDII code B3875 GMC?

Yes, exposure to extreme weather conditions such as heavy rain, snow, or intense sunlight can potentially accelerate wear and tear on the windshield wiper system components, leading to issues like the high-speed relay circuit fault.

9. How long does it typically take to repair OBDII code B3875 GMC?

The repair time can vary depending on the specific cause of the issue and your experience level. Simple fixes like replacing a relay may take less than an hour, while more complex wiring repairs could take longer.

10. Should I seek professional help for OBDII code B3875 GMC, or is it a straightforward repair?

If you are not confident in diagnosing or repairing electrical issues in your vehicle, it's recommended to seek assistance from a qualified mechanic or automotive technician to ensure the problem is properly addressed.