OBD-II diagnostic trouble code
B0051Caution

Driver Seat Belt Switch Circuit Malfunction

The driver's seat belt buckle switch has an electrical fault, which can cause a false or missing seat-belt warning.

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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 B0051?

You can usually keep driving with B0051, but don't put it off — the underlying cause can get worse or lead to further damage the longer it goes unaddressed. Get it diagnosed as soon as you reasonably can.

How much does it cost to fix B0051?

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

What causes B0051?

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