Faulty driver seat occupant position sensor; Damaged or chafed wiring harness under the seat; Loose or corroded electrical connector at the sensor; Failed seat position motor or track mechanism affecting sensor reading; Body control module (BCM) software glitch or internal fault; Aftermarket seat covers or accessories interfering with sensor operation

DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B00B8

B00B8Driver Seat Occupant Position Sensor B

Q: What does code B00B8 mean?

Driver Seat Occupant Position Sensor B. B00B8 indicates that the body control module (BCM) or occupant detection module has detected a fault in the driver seat occupant position sensor circuit, specifically the 'B' sensor if multiple are used. The computer monitors the sensor's signal voltage and sets this code when the reading falls outside the expected range or the circuit has an open, short, or erratic signal.

B00B8 indicates that the body control module (BCM) or occupant detection module has detected a fault in the driver seat occupant position sensor circuit, specifically the 'B' sensor if multiple are used. The computer monitors the sensor's signal voltage and sets this code when the reading falls outside the expected range or the circuit has an open, short, or erratic signal.

SystemBody

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Airbag warning light illuminated on the instrument cluster
Seat position memory or easy-entry feature may not function correctly
Driver seat may not automatically adjust to the stored position
Passenger airbag may be disabled or enabled incorrectly if the system shares data
Often no symptoms besides the warning light

Common causes, most likely first

Faulty driver seat occupant position sensor
Damaged or chafed wiring harness under the seat
Loose or corroded electrical connector at the sensor
Failed seat position motor or track mechanism affecting sensor reading
Body control module (BCM) software glitch or internal fault
Aftermarket seat covers or accessories interfering with sensor operation

How to diagnose and fix it

Inspect the under-seat wiring and connectors for damage, corrosion, or looseness
Check the sensor mounting and ensure it is securely attached to the seat track
Measure the sensor resistance and compare to manufacturer specifications
Test the sensor signal voltage at the connector with a multimeter while moving the seat
Clear the code and perform a seat calibration or relearn procedure if required
Replace the driver seat occupant position sensor if tests indicate failure
Repair or replace damaged wiring and connectors, then verify the code does not return

Seat Sensor Diagnostics Beyond the Obvious

A common oversight is assuming the sensor itself is faulty when the real problem is a chafed wire under the seat that only acts up when the seat is moved.
The code can be set by a weak battery or low voltage condition, so always check the charging system before replacing parts.
Aftermarket seat covers or heavy objects left on the seat can interfere with the sensor's magnetic or mechanical operation and trigger this code.
Some vehicles require a seat position sensor calibration after replacement or battery disconnect, and skipping this step will cause the code to return.
The B00B8 code may be accompanied by other body codes that point to a shared ground or power supply issue rather than the sensor itself.

Can I keep driving with B00B8?

You can generally continue driving with this code, but the airbag system may be compromised in a collision, so have it diagnosed promptly. Avoid moving the seat repeatedly until repaired, as this could worsen a wiring fault.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.