OBD-II diagnostic trouble code
B0100Safe to drive

Rain Sensor Malfunction

The windshield rain sensor used for automatic wipers has failed, a comfort-feature fault with no effect on safety systems.

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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.

Frequently asked questions

Can I drive with B0100?

In most cases, yes — B0100 is generally not an urgent safety issue and the car is usually safe to drive for a while. Still, get it checked soon, since the underlying cause can affect fuel economy or emissions the longer it's left.

How much does it cost to fix B0100?

The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.

What causes B0100?

AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief
Code names compiled from open SAE/ISO references; explanations and repair guidance are original editorial content
Last verified: 09 Jul 2026 · Our methodology