Damaged or chafed wiring in the left-side deployment stage 2 circuit, often at the steering column or door hinge area; Loose, corroded, or unseated connector at the airbag module or clock spring; Failed clock spring (spiral cable) in the steering wheel, which carries the driver airbag circuits; Open or shorted deployment stage 2 squib inside the airbag module itself; Water intrusion or corrosion in a connector or splice along the left-side airbag harness; Internal fault in the airbag control module (less common); Aftermarket accessories or previous repair work that disturbed the airbag wiring

DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B0025

B0025Left Side Deployment Stage 2 Control

Q: What does code B0025 mean?

Left Side Deployment Stage 2 Control. B0025 indicates that the airbag control module has detected an open circuit, short to ground, or short to voltage in the second deployment stage of the left-side frontal airbag circuit, which is the second stage of the driver's airbag on many vehicles or the left-front passenger airbag on others. The module stores this code when the measured resistance or voltage on that control line falls outside the expected range during its self-test.

B0025 indicates that the airbag control module has detected an open circuit, short to ground, or short to voltage in the second deployment stage of the left-side frontal airbag circuit, which is the second stage of the driver's airbag on many vehicles or the left-front passenger airbag on others. The module stores this code when the measured resistance or voltage on that control line falls outside the expected range during its self-test.

SystemBody

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Airbag warning light illuminated on the instrument cluster
Often no symptoms besides the warning light
Airbag system may be disabled, offering no protection in a collision
Intermittent warning light that comes and goes with vibration or temperature changes
Passenger airbag status indicator may show a fault or default to off
No other drivability symptoms, since the fault is confined to the supplemental restraint system

Common causes, most likely first

Damaged or chafed wiring in the left-side deployment stage 2 circuit, often at the steering column or door hinge area
Loose, corroded, or unseated connector at the airbag module or clock spring
Failed clock spring (spiral cable) in the steering wheel, which carries the driver airbag circuits
Open or shorted deployment stage 2 squib inside the airbag module itself
Water intrusion or corrosion in a connector or splice along the left-side airbag harness
Internal fault in the airbag control module (less common)
Aftermarket accessories or previous repair work that disturbed the airbag wiring

How to diagnose and fix it

Verify the code with a scan tool that can read airbag module data and record any freeze-frame or resistance values
Inspect the left-side airbag connectors and wiring for looseness, corrosion, or damage, especially at the steering column and under the dash
Check the clock spring for continuity and mechanical damage if the code relates to the driver airbag stage 2
Measure resistance across the deployment stage 2 squib circuit with the airbag module disconnected, following manufacturer procedures
Repair or replace any damaged wiring, connectors, or the clock spring as needed
Clear the code and perform the manufacturer's airbag system verification test to confirm the repair
If the fault persists after circuit repairs, replace the airbag module or the airbag control module only after ruling out all wiring issues

What the airbag code really tells you

B0025 is often set by a poor connection at the airbag module connector rather than a failed airbag, so a careful connector inspection can save an unnecessary airbag replacement.
The code does not always mean the airbag is defective; it can be triggered by a momentary open circuit during a low-voltage event or by a weak battery.
On vehicles with a dual-stage driver airbag, stage 2 is the second charge, and a fault here may not disable stage 1, but the system will still log the code and illuminate the warning light.
After any airbag circuit repair, the airbag control module may need to be reset or the code cleared with a capable scan tool before the warning light will go out.
Never use a standard ohmmeter to probe an airbag squib directly; the meter's current can trigger deployment, so always follow the manufacturer's diagnostic procedure.

Can I keep driving with B0025?

Because the airbag system may be disabled, the vehicle should not be driven until the fault is repaired, as occupants would be unprotected in a collision. If you must move the vehicle a short distance, do so cautiously and avoid any situation where airbag deployment might be needed.

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.