B3873 2015 GMC Sierra Code - Front Washer Relay Circuit
Quick Answer
The B3873 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the front washer relay circuit. Common causes include Faulty front washer relay, Wiring issues or loose connections in the front washer relay circuit, Defective washer switch. 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, Wiring issues or loose connections in the front washer relay circuit, Defective washer switch.
- 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 2015 GMC Sierra Description
The B3873 diagnostic trouble code (DTC) for a 2015 GMC Sierra 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 is a crucial component that activates the front windshield washer pump when the washer switch is engaged. When this circuit malfunctions, it can lead to the front windshield washer system not working properly, which can compromise visibility and safety while driving.
Common Causes of B3873 2015 GMC Sierra
- Faulty front washer relay.
- Wiring issues or loose connections in the front washer relay circuit.
- Defective washer switch.
- Blown fuse related to the front washer relay circuit.
- Corrosion or damage to the front washer pump.
Symptoms of B3873 2015 GMC Sierra
- Front windshield washer not spraying fluid.
- Washer fluid pump not activating when washer switch is engaged.
- Intermittent operation of front windshield washer.
- Washer fluid pump running continuously without stopping.
- Front washer relay clicking sound when washer switch is activated.
How to Fix B3873 2015 GMC Sierra
- Begin by inspecting the front washer relay and associated wiring for any visible damage or loose connections.
- Test the front washer relay using a multimeter to determine if it is functioning correctly.
- Check the washer switch for proper operation and replace if necessary.
- Inspect and test the front washer pump to ensure it is working correctly.
- Replace any faulty components, such as the front washer relay, wiring, washer switch, or washer pump, as needed.
Cost to Fix B3873 2015 GMC Sierra
The cost of repairing a front washer relay circuit issue can vary depending on the specific cause of the problem and the cost of parts and labor. On average, the repair cost for this issue can range from $100 to $300, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to get an accurate estimate for your specific vehicle.
Tech Notes for B3873 2015 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 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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