B3873 2018 GMC Sierra Code - Front Washer Relay Circuit
Quick Answer
The B3873 diagnostic trouble code (DTC) for the front washer relay circuit in a 2018 GMC Sierra indicates a problem with the electrical circuit that controls the front windshield washer system. Common causes include Faulty front washer relay, Wiring issues or loose connections in the front washer circuit, Defective front washer pump. 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 GMC Sierra indicates Front Washer Relay Circuit.
- Common causes
- Common causes include Faulty front washer relay, Wiring issues or loose connections in the front washer circuit, Defective front washer pump.
- 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 B3873 2018 GMC Sierra Description
The B3873 diagnostic trouble code (DTC) for the front washer relay circuit in a 2018 GMC Sierra indicates a problem with the electrical circuit that controls the front windshield washer system. This code is typically triggered when the Body Control Module (BCM) detects an issue with the relay that controls the front washer pump. The front washer relay circuit plays a crucial role in ensuring that the windshield washer system functions properly, allowing the driver to clean the windshield for better visibility while driving.
Common Causes of B3873 2018 GMC Sierra
- Faulty front washer relay.
- Wiring issues or loose connections in the front washer circuit.
- Defective front washer pump.
- BCM malfunction.
- Corrosion in the front washer relay circuit.
Symptoms of B3873 2018 GMC Sierra
- Front windshield washer not spraying washer fluid.
- No sound or activity when trying to use the front washer function.
- Washer fluid not reaching the windshield when activated.
- Check engine light illuminated on the dashboard.
How to Fix B3873 2018 GMC Sierra
- Begin by inspecting the front washer relay and checking for any visible signs of damage or corrosion. Replace the relay if necessary.
- Check the wiring connections in the front washer circuit for any loose or damaged wires. Repair or replace any faulty wiring.
- Test the front washer pump to ensure it is functioning correctly. Replace the pump if it is defective.
- If the issue persists, diagnose the BCM for any malfunctions and replace if needed.
- Clear the DTC from the vehicle's memory using a diagnostic scan tool to reset the system and ensure the issue has been resolved.
Cost to Fix B3873 2018 GMC Sierra
The cost of repairing the front washer relay circuit can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this code can range from $100 to $300, including parts and labor. Keep in mind that labor rates at auto repair shops can vary, so it's recommended to get quotes from different shops to find the best price for the repair.
Tech Notes for B3873 2018 GMC Sierra
B3873:02 Front Washer Relay Circuit Short to Ground
B3873:04 Front Washer Relay Circuit Open
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Frequently Asked Questions about B3873 2018 GMC Sierra Code
1. What does the OBDII code B3873 mean on a 2018 GMC Sierra?
B3873 indicates an issue with the Front Washer Relay Circuit, which controls the operation of the front windshield washer system.
2. What are the common symptoms of code B3873 on a 2018 GMC Sierra?
Symptoms may include the windshield washer not spraying, intermittent washer operation, or the washer system failing to activate when needed.
3. What causes the B3873 code to appear on a 2018 GMC Sierra?
Common causes include a faulty front washer relay, damaged wiring or connectors in the washer circuit, or issues with the body control module (BCM).
4. How can I diagnose the B3873 code on my GMC Sierra?
Start by checking the washer relay for proper operation, inspect the wiring and connectors for damage or corrosion, and use a scan tool to verify BCM functionality.
5. Can a blown fuse cause the B3873 code on a 2018 GMC Sierra?
Yes, a blown fuse related to the windshield washer system can interrupt the circuit and trigger this code.
6. How do I fix the B3873 code on my 2018 GMC Sierra?
Repairs may include replacing a faulty washer relay, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the BCM if necessary.
7. Is it safe to drive with the B3873 code active on my 2018 GMC Sierra?
Yes, but driving without a functional windshield washer system can reduce visibility in poor weather, which may compromise safety.
8. How much does it cost to repair the B3873 code on a 2018 GMC Sierra?
The cost can vary, but replacing a washer relay typically costs between $50 and $150, while wiring repairs or BCM reprogramming may cost more.
9. Can I reset the B3873 code without repairing anything on my GMC Sierra?
You can clear the code with a scan tool, but if the underlying issue isn’t fixed, the code will likely return.
10. What tools are needed to troubleshoot the B3873 code on a 2018 GMC Sierra?
You’ll need a scan tool to read and clear codes, a multimeter to test wiring and relay functionality, and potentially a wiring diagram for the washer circuit.
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