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B3873 2018 Chevrolet Silverado Code - Front Washer Relay Circuit

Quick Answer

The B3873 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado relates to the front washer relay circuit. Common causes include Faulty front washer relay, Wiring issues such as frayed or damaged wires, Defective body control module (BCM). 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 2018 Chevrolet Silverado indicates Front Washer Relay Circuit.
Common causes
Common causes include Faulty front washer relay, Wiring issues such as frayed or damaged wires, Defective body control module (BCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B3873 2018 Chevrolet Silverado Description

The B3873 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado relates to the front washer relay circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the front windshield washer system. The front washer relay circuit plays a crucial role in activating the front windshield washer pump to spray washer fluid onto the windshield for cleaning purposes. When this circuit malfunctions, it can lead to the front windshield washer system not functioning properly, resulting in reduced visibility and potential safety hazards while driving.

OBDII Code B3873 2018 Chevrolet Silverado - Front Washer Relay Circuit
B3873 2018 Chevrolet Silverado Code - Front Washer Relay Circuit

Common Causes of B3873 2018 Chevrolet Silverado

  1. Faulty front washer relay.
  2. Wiring issues such as frayed or damaged wires.
  3. Defective body control module (BCM).
  4. Poor electrical connections.
  5. Corrosion in the front washer relay circuit.

Symptoms of B3873 2018 Chevrolet Silverado

  1. Front windshield washer system not spraying washer fluid.
  2. Check engine light illuminated on the dashboard.
  3. Washer fluid pump not activating when windshield washer function is used.
  4. Washer fluid not reaching the windshield when sprayed.

How to Fix B3873 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the front washer relay circuit, including the relay, wiring, and connections.
  2. Test the front washer relay for proper functionality using a multimeter to determine if it is faulty.
  3. Check for any damaged or corroded wires in the circuit and repair or replace them as needed.
  4. If the issue lies with the body control module, it may need to be replaced or reprogrammed by a professional technician.
  5. Once the necessary repairs have been made, clear the DTC and test the front windshield washer system to ensure proper functionality.

Cost to Fix B3873 2018 Chevrolet Silverado

The typical repair costs for addressing the B3873 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of replacing a front washer relay or repairing wiring issues can range from $100 to $300, including parts and labor. However, if the problem is related to a faulty body control module, the cost may be higher, potentially ranging from $300 to $600 or more. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for B3873 2018 Chevrolet Silverado

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

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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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B3873 in a 2018 Chevrolet Silverado?

The common symptoms of OBDII code B3873 in a 2018 Chevrolet Silverado include inoperative front windshield washer sprayers and a lack of washer fluid being dispensed onto the windshield.

2. What does OBDII code B3873 indicate in a 2018 Chevrolet Silverado?

OBDII code B3873 in a 2018 Chevrolet Silverado indicates a problem with the front washer relay circuit, specifically related to the windshield washer system.

3. What are the possible causes of OBDII code B3873 in a 2018 Chevrolet Silverado?

Possible causes of OBDII code B3873 in a 2018 Chevrolet Silverado include a faulty front washer relay, damaged wiring or connectors in the relay circuit, or issues with the washer fluid pump.

4. How can I diagnose the front washer relay circuit issue causing OBDII code B3873 in my 2018 Chevrolet Silverado?

To diagnose the front washer relay circuit issue causing OBDII code B3873, you can start by checking the front washer relay, inspecting the wiring and connectors for any damage, and testing the washer fluid pump for proper functionality.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code B3873?

It is not recommended to continue driving your 2018 Chevrolet Silverado with OBDII code B3873, as the malfunction in the front washer relay circuit can impact visibility and safety while driving.

6. How can I repair OBDII code B3873 in my 2018 Chevrolet Silverado?

To repair OBDII code B3873 in your 2018 Chevrolet Silverado, you may need to replace the front washer relay, repair any damaged wiring or connectors, or troubleshoot and fix issues with the washer fluid pump.

7. Are there any DIY tips for fixing OBDII code B3873 in a 2018 Chevrolet Silverado?

While some basic troubleshooting steps can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for repairing OBDII code B3873 in a 2018 Chevrolet Silverado to ensure proper diagnosis and resolution.

8. How much does it typically cost to fix OBDII code B3873 in a 2018 Chevrolet Silverado?

The cost of fixing OBDII code B3873 in a 2018 Chevrolet Silverado can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor costs, and diagnostic fees.

9. Is OBDII code B3873 a common issue in 2018 Chevrolet Silverado vehicles?

While OBDII code B3873 related to the front washer relay circuit is not as common as some other OBDII codes, it can still occur in 2018 Chevrolet Silverado vehicles due to various factors such as wear and tear or electrical faults.

10. Can OBDII code B3873 in a 2018 Chevrolet Silverado trigger the check engine light?

OBDII code B3873 related to the front washer relay circuit is not typically associated with triggering the check engine light in a 2018 Chevrolet Silverado. However, it may illuminate other warning lights on the dashboard related to the washer system.

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