AutoCodes – Chevrolet – B3873 2017 Chevrolet Silverado

B3873 2017 Chevrolet Silverado Code - Front Washer Relay Circuit

Quick Answer

The windshield washer function is controlled by the Body Control Module (BCM). Common causes include Faulty Front Washer Relay, Front Washer Relay harness is open or shorted, Front Washer 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: B3873 2017 Chevrolet Silverado indicates Front Washer Relay Circuit.
Common causes: Common causes include Faulty Front Washer Relay, Front Washer Relay harness is open or shorted, Front Washer 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 193

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3873 2017 Chevrolet Silverado Description

The windshield washer function is controlled by the Body Control Module (BCM). When the washer switch is pressed, low reference is applied through the switch contacts and the signal circuit to the body control module indicating the wash request. The body control module then applies voltage through the control circuit to the coil side of the windshield washer pump relay energizing the relay. With the relay energized, battery voltage from the fuse is applied through the switch contacts of the relay and the control circuit to the windshield washer fluid pump.

OBDII Code B3873 2017 Chevrolet Silverado - Front Washer Relay Circuit - AutoCodes.com — B3873 2017 Chevrolet Silverado Code - Front Washer Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3873 2017 Chevrolet Silverado?

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

How to Fix the DTC B3873 2017 Chevrolet Silverado?

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 does this mean?

Code Tech Notes

B3873:01 Front Washer Relay Circuit Short to Battery
B3873:02 Front Washer Relay Circuit Short to Ground
B3873:04 Front Washer Relay Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3873 2017 Chevrolet Silverado 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 B3873 2017 Chevrolet Silverado code?

Need more information on how to fix the B3873 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 B3873 2017 Chevrolet Silverado Code

1. What does the OBDII code B3873 mean on a 2017 Chevrolet Silverado?

Code B3873 indicates an issue with the front washer relay circuit, which is responsible for controlling the operation of the windshield washer system.

2. What are the common symptoms of the B3873 code on a 2017 Chevrolet Silverado?

Symptoms may include the windshield washer not activating, the washer pump not functioning, or a related warning light on the dashboard.

3. What causes the B3873 code to appear?

The code can be caused by a faulty front washer relay, wiring issues such as an open or short circuit, a malfunctioning washer pump, or a problem with the body control module (BCM).

4. How can I diagnose the B3873 code on my Silverado?

Start by checking the front washer relay and its connections, inspect the wiring for damage or corrosion, and test the washer pump for proper operation.

5. Can I still drive my Chevrolet Silverado with the B3873 code active?

Yes, the truck is drivable, but the windshield washer may not operate, which could reduce visibility in adverse weather conditions and compromise safety.

6. How do I fix the B3873 code on a 2017 Chevrolet Silverado?

Repairs may include replacing the front washer relay, repairing damaged wiring, cleaning corroded connectors, or replacing the washer pump if necessary.

7. Where is the front washer relay located on a 2017 Chevrolet Silverado?

The front washer relay is typically located in the underhood fuse box. Refer to your ownerâ€™s manual or fuse box diagram for its exact position.

8. How much does it cost to repair the B3873 code?

Repair costs vary but typically range from $50 to $200, depending on whether the issue is with the relay, wiring, or washer pump.

9. Can a faulty BCM cause the B3873 code?

Yes, a malfunctioning body control module can cause the code, but this is less common and should be considered only after ruling out simpler causes like the relay or wiring.

10. Do I need any special tools to fix the B3873 code?

Basic tools like a multimeter to test electrical connections and a socket set for component removal are usually sufficient for diagnosing and repairing this code.