AutoCodes – Chevrolet – B3873 2015 Chevrolet Silverado

B3873 2015 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 2015 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 328

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 2015 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 2015 Chevrolet Silverado - Front Washer Relay Circuit - AutoCodes.com — B3873 2015 Chevrolet Silverado Code - Front Washer Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3873 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the B3873 2015 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 2015 Chevrolet Silverado Code

1. What does the OBDII code B3873 mean on a 2015 Chevrolet Silverado?

B3873 indicates an issue in the Front Washer Relay Circuit, which controls the operation of the windshield washer system.

2. What are the common symptoms of B3873 in a 2015 Chevrolet Silverado?

Symptoms may include the windshield washer not functioning, the washer pump not activating, or an illuminated check engine or related warning light.

3. What causes the B3873 code to appear?

This code is usually triggered by a faulty front washer relay, damaged wiring or connectors in the washer circuit, or a malfunctioning windshield washer pump.

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

Yes, you can still drive, but the windshield washer system may not work, which could impact visibility in adverse weather conditions.

5. How do I diagnose the B3873 code on my 2015 Silverado?

Start by inspecting the washer relay, wiring, and connections for damage or corrosion. Use a multimeter to test the circuit and confirm proper voltage and continuity.

6. What parts might need replacement to fix the B3873 code?

Potential parts include the front washer relay, the windshield washer pump, or damaged wiring/connectors in the circuit.

7. 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 a simple relay replacement or wiring repair.

8. Can I fix the B3873 code myself?

If you have basic automotive repair knowledge, you can inspect and replace the washer relay or repair damaged wiring. However, more complex electrical issues may require professional assistance.

9. How do I prevent the B3873 code from recurring?

Regularly inspect the washer system components for damage, ensure connectors are clean and secure, and replace faulty parts promptly.

10. Does the B3873 code require reprogramming or software updates?

No, this code typically doesnâ€™t involve reprogramming. Itâ€™s an electrical fault that can be resolved by repairing or replacing the faulty components in the circuit.