B0084

Driver Belt Buckle Switch Circuit

Moderate severity

The SRS module has detected a fault in the driver belt buckle switch circuit. The fastened-state of the seat belt cannot be reliably read — affects belt warning and airbag deployment logic.

Common causes

Buckle switch failed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $110-660
Wiring under seat open
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $110-660
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does B0084 mean?

B0084 means "Driver Belt Buckle Switch Circuit". It is a generic OBD-II code that points to a fault in the body.

What are the most common causes of B0084?

buckle switch failed; wiring under seat open — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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