B3874 Chevrolet Code - Wiper Low Speed Relay Circuit
Quick Answer
The Body Control Module (BCM) controls and monitors the state of the wiper control circuit. Common causes include Faulty Wiper Low Speed Relay, Wiper Low Speed Relay harness is open or shorted, Wiper Low Speed 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
- B3874 Chevrolet indicates Wiper Low Speed Relay Circuit.
- Common causes
- Common causes include Faulty Wiper Low Speed Relay, Wiper Low Speed Relay harness is open or shorted, Wiper Low Speed 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 B3874 Chevrolet Description
What are the Possible Causes of the DTC B3874 Chevrolet?
- Faulty Wiper Low Speed Relay
- Wiper Low Speed Relay harness is open or shorted
- Wiper Low Speed Relay circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3874 Chevrolet?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3874 Chevrolet 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 B3874 Chevrolet Code
What does the OBDII code B3874 mean on a Chevrolet?
1. The B3874 code indicates a problem with the Wiper Low Speed Relay Circuit, which affects the operation of the windshield wipers at low speed. 2.
What are the common symptoms of the B3874 code in a Chevrolet?
Symptoms include wipers not working at low speed, intermittent wiper function failure, or wipers stuck in one position. 3.
What causes the B3874 code to appear on a Chevrolet?
Common causes include a faulty low-speed wiper relay, damaged wiring or connectors in the wiper circuit, or a malfunctioning windshield wiper motor. 4.
Can a blown fuse trigger the B3874 code in a Chevrolet?
Yes, a blown fuse related to the wiper system can cause this code, as it disrupts the electrical flow to the wiper low-speed relay circuit. 5.
How can I diagnose the B3874 code on my Chevrolet?
Inspect the wiring and connectors for damage, test the low-speed relay for functionality, and check the wiper motor for proper operation. 6.
Is the B3874 code dangerous to drive with?
While not immediately dangerous, limited wiper functionality can reduce visibility during rain, potentially making driving unsafe. 7.
How do I fix the B3874 code on a Chevrolet?
Repairs may involve replacing the low-speed wiper relay, repairing or replacing damaged wiring, or replacing the wiper motor if it’s faulty. 8.
Can the B3874 code clear itself after repairs?
The code may need to be cleared with an OBDII scanner after the issue is fixed, though some vehicles may clear it automatically after several drive cycles. 9.
How much does it typically cost to fix the B3874 code in a Chevrolet?
Repair costs can range from $50 to $300, depending on whether the issue is with the relay, wiring, or wiper motor. 10.
Can extreme weather conditions trigger the B3874 code?
Yes, exposure to moisture, corrosion, or extreme temperatures can damage wiring or components in the wiper circuit, triggering the code.
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