B3873 2015 GMC Sierra 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 GMC Sierra 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.
Code B3873 2015 GMC Sierra Description
What are the Possible Causes of the DTC B3873 2015 GMC Sierra?
- 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 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.
Code Tech Notes
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 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.
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Frequently Asked Questions about B3873 2015 GMC Sierra Code
1. What does the OBDII code B3873 mean on a 2015 GMC Sierra?
B3873 indicates an issue with the front washer relay circuit, which controls the operation of the windshield washer system.
2. What are common symptoms of the B3873 code on a 2015 GMC Sierra?
Symptoms may include the windshield washer not spraying fluid, the washer pump not activating, or the windshield washer relay not clicking when engaged.
3. What causes the B3873 code on a 2015 GMC Sierra?
Common causes include a faulty washer relay, damaged wiring or connectors in the circuit, a malfunctioning washer pump, or a bad body control module (BCM).
4. Can I still drive my GMC Sierra with the B3873 code?
Yes, you can still drive the vehicle, but the windshield washer system may not function, which could reduce visibility and safety in poor weather conditions.
5. How do I diagnose the B3873 code on my 2015 GMC Sierra?
Start by inspecting the washer relay, fuse, wiring, and connectors for damage or corrosion. Use a multimeter to test for continuity and power in the circuit.
6. How do I fix the B3873 code on a 2015 GMC Sierra?
Repairs may include replacing a faulty washer relay, repairing damaged wiring or connectors, replacing the washer pump, or reprogramming or replacing the BCM if necessary.
7. Where is the front washer relay located on a 2015 GMC Sierra?
The front washer relay is typically located in the engine compartment fuse box. Consult the owner’s manual or fuse box diagram for the exact location.
8. How much does it cost to repair the B3873 code on a 2015 GMC Sierra?
The repair cost can vary depending on the issue, but replacing a washer relay typically costs $20-$50, while more extensive wiring or BCM repairs can cost several hundred dollars.
9. Can a blown fuse cause the B3873 code on a GMC Sierra?
Yes, a blown fuse in the washer circuit can trigger the code by interrupting power to the washer relay or pump.
10. Do I need to clear the B3873 code after making repairs?
Yes, use an OBDII scanner to clear the code after completing repairs. If the issue is resolved, the code should not return.
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