OBD-II Body Error Code B0840: How to Fix It

Q: Can I drive with error code B0840?

Yes, you can typically drive with this error code as it only affects the wiper system, not engine operation. However, you should fix it promptly since working wipers are essential for safe driving in rain or snow.

Q: What causes wiper motor circuit electrical problems?

Common causes include blown fuses, corroded electrical connections, worn wiper motor brushes, damaged wiring, or a faulty wiper motor. Age and exposure to weather are the most frequent contributing factors.

Q: How much does it cost to fix B0840 error code?

Costs vary widely depending on the root cause. A blown fuse costs under $5, while a new wiper motor can range from $50-200. Professional diagnosis and repair typically costs $100-300 including parts and labor.

Q: Will disconnecting the battery clear B0840 code?

Disconnecting the battery may temporarily clear the code from memory, but it will return if the underlying electrical problem isn't fixed. Use an OBD-II scanner to properly clear codes after completing repairs.

Q: How do I know if my wiper motor is bad?

Signs of a bad wiper motor include wipers that don't move at all, move very slowly, make grinding noises, don't park properly, or only work on certain speed settings. If the motor gets power but doesn't work, it likely needs replacement.

Abstract

Error code B0840 indicates an electrical problem in your vehicle's wiper motor circuit. This code typically appears when the body control module detects abnormal voltage, current, or resistance in the windshield wiper motor system.