B3873 GMC Code - Front Washer Relay Circuit
Quick Answer
The B3873 diagnostic trouble code (DTC) for GMC vehicles refers to an issue with 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 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 GMC 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 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 GMC Description
The B3873 diagnostic trouble code (DTC) for GMC vehicles refers to an issue with 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 washer pump to spray washer fluid onto the windshield for cleaning. When this circuit fails, it can lead to a variety of issues that affect visibility and overall driving safety.
Common Causes of B3873 GMC
- Faulty front washer relay.
- Wiring issues or loose connections in the front washer relay circuit.
- Defective washer pump.
- Corrosion or damage to the washer fluid reservoir.
- Electrical issues within the windshield washer system.
Symptoms of B3873 GMC
- Front windshield washer system fails to spray washer fluid.
- Washer pump does not activate when windshield washer control is engaged.
- Reduced visibility due to the inability to clean the windshield effectively.
- Front wipers may not function properly in conjunction with the washer system.
How to Fix B3873 GMC
- 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 pump for proper operation and replace if necessary.
- Inspect the washer fluid reservoir for any leaks or damage and address as needed.
- Clear any corrosion or debris from the front washer relay circuit to ensure proper electrical connections.
Cost to Fix B3873 GMC
The typical repair costs for addressing a front washer relay circuit issue can vary depending on the extent of the problem and the specific components that require replacement. In general, the cost of parts for this repair can range from $50 to $150, while labor costs may add an additional $80 to $150 per hour. Overall, the total repair cost for resolving a B3873 DTC related to the front washer relay circuit is estimated to be between $150 and $300. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates can vary based on location, vehicle make and model, and other factors.
Tech Notes for B3873 GMC
B3873:02 Front Washer Relay Circuit Short to Ground
B3873:04 Front Washer Relay Circuit Open
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Information for Specific GMC Models
- B3873 2014 GMC Sierra — Front Washer Relay Circuit
- B3873 2015 GMC Sierra — Front Washer Relay Circuit
- B3873 2016 GMC Sierra — Front Washer Relay Circuit
- B3873 2017 GMC Sierra — Front Washer Relay Circuit
- B3873 2018 GMC Sierra — Front Washer Relay Circuit
Frequently Asked Questions about B3873 GMC Code
1. What does the OBDII code B3873 mean on a GMC vehicle?
B3873 indicates a malfunction in the Front Washer Relay Circuit, which controls the operation of the front windshield washer system.
2. What are the common symptoms of the B3873 code?
Symptoms include the windshield washer not spraying fluid, intermittent washer operation, or the washer relay making unusual noises.
3. What causes the B3873 code to appear?
Common causes include a faulty washer relay, damaged wiring or connectors in the washer circuit, a blown fuse, or a malfunctioning washer pump.
4. Can I still drive my GMC with the B3873 code active?
Yes, the vehicle is still drivable, but the windshield washer system may not function, potentially reducing visibility in poor weather conditions.
5. How do I diagnose the B3873 code?
Start by checking the washer relay and fuse. Inspect the wiring and connectors for damage or corrosion. If no issues are found, test the washer pump for proper operation.
6. How do I fix the B3873 code on my GMC?
Repairs may involve replacing the faulty washer relay, repairing damaged wiring or connectors, replacing a blown fuse, or replacing the washer pump if it's defective.
7. How much does it cost to fix the B3873 code?
Costs can vary, but replacing a washer relay typically costs $20-$50 for the part, plus labor if done by a mechanic. Wiring repairs or pump replacement may cost more, depending on the extent of the issue.
8. Can I clear the B3873 code without fixing it?
Clearing the code with an OBDII scanner will temporarily remove it, but the underlying issue will cause the code to reappear until properly fixed.
9. What tools are needed to troubleshoot the B3873 code?
You'll need an OBDII scanner, a multimeter to test electrical components, and basic hand tools to access and inspect the washer system components.
10. Is the B3873 code common on GMC vehicles?
This code is not particularly common but may occur in older vehicles or those with frequent use of the washer system in harsh weather conditions.
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