AutoCodes – GMC – B3875 2017 GMC Sierra

B3875 2017 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 2017 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 372

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B3875 2017 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 2017 GMC Sierra - Windshield Wiper High Speed Relay Circuit - AutoCodes.com — B3875 2017 GMC Sierra Code - Windshield Wiper High Speed Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3875 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the B3875 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3875 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B3875 in a 2017 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit?

The common symptoms include non-functioning high-speed windshield wiper operation or erratic wiper speeds.

2. What could be the potential causes of OBDII code B3875 in a 2017 GMC Sierra?

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

3. How can I diagnose the Windshield Wiper High Speed Relay Circuit issue in my 2017 GMC Sierra?

You can use a multimeter to test the high-speed relay, inspect the wiring for any visible damage, and perform a continuity test to identify any open circuits.

4. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B3875 related to the Windshield Wiper High Speed Relay Circuit?

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

5. Can I repair the Windshield Wiper High Speed Relay Circuit issue in my 2017 GMC Sierra myself?

If you have experience with automotive electrical systems and the necessary tools, you may be able to repair the issue yourself by following a detailed repair guide specific to your vehicle.

6. What are the possible consequences of ignoring OBDII code B3875 in a 2017 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit?

Ignoring the issue can lead to reduced visibility during rain or snow, increasing the risk of accidents due to impaired windshield wiper functionality.

7. How much does it typically cost to repair the Windshield Wiper High Speed Relay Circuit issue in a 2017 GMC Sierra at a professional auto repair shop?

The cost of repairs can vary depending on the extent of the issue, the labor rates in your area, and whether any parts need to be replaced. It's advisable to get a few quotes from different shops.

8. Can extreme weather conditions or environmental factors contribute to triggering OBDII code B3875 in a 2017 GMC Sierra?

Extreme cold or heat, moisture ingress, or exposure to corrosive elements can potentially affect the windshield wiper high-speed relay circuit and lead to the triggering of this OBDII code.

9. Are there any preventive maintenance steps I can take to avoid encountering issues with the Windshield Wiper High Speed Relay Circuit in my 2017 GMC Sierra?

Regularly inspecting and cleaning the windshield wiper system, ensuring proper operation, and addressing any minor issues promptly can help prevent more significant problems with the circuit.

10. Does fixing OBDII code B3875 in a 2017 GMC Sierra related to the Windshield Wiper High Speed Relay Circuit require resetting the vehicle's computer system?

After repairing the issue, you may need to clear the error code stored in the vehicle's computer system using an OBDII scanner to reset the system and ensure the problem is resolved.