B3874
Wiper Low Speed Relay Circuit
B3874 is an OBD-II diagnostic trouble code meaning: Wiper Low Speed Relay Circuit. Common causes: faulty low speed wiper relay, open or short circuit in wiring harness. Estimated repair cost: $11–56.
Symptoms
- Wipers do not work at low speed
- Wipers only work at high speed
- Intermittent wiper operation
Causes
- Faulty low speed wiper relay
- Open or short circuit in wiring harness
- Problems with the control signal from the control unit
- Oxidation of relay contacts or connectors
How to Fix
- Check the low speed wiper relay
- Inspect the wiring harness for damage
- Check relay contacts and connectors for oxidation
- Replace relay if necessary
- Check the control signal from the control unit
Related codes
Error B3874 by Vehicle Brand
FAQ
What does the B3874 code mean?
B3874 is an OBD-II diagnostic trouble code that indicates: Wiper Low Speed Relay Circuit
What causes a B3874 error code?
The most common causes of B3874 include: Faulty low speed wiper relay; Open or short circuit in wiring harness; Problems with the control signal from the control unit; Oxidation of relay contacts or connectors.
How do I fix a B3874 diagnostic trouble code?
To fix B3874: Check the low speed wiper relay. Inspect the wiring harness for damage. Check relay contacts and connectors for oxidation. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3874?
Limited driving only, diagnose soon
How much does it cost to fix B3874?
The estimated repair cost for B3874 is $11–56. Actual cost depends on your vehicle, location, and labor rates.
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