OBD-II trouble code
B0010: Passenger Frontal Stage 1 Deployment Control (Subfault)
An electrical fault in the first-stage firing loop of the passenger frontal airbag. Stage 1 is the stage that fires in essentially every frontal deployment, which makes this the most consequential loop fault in the passenger-side family — and on a recently repaired car it is also the one that most often means the airbag is not there.
Quick facts
- System
- Body
- Category
- Airbag / SRS Restraints
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $1,400
- DIY difficulty
- Shop recommended
What does B0010 mean?
B0010 is stored by the restraints control module when the first-stage firing loop for the passenger frontal airbag falls outside the narrow resistance window a pyrotechnic circuit has to hold. A symptom byte appended to the code identifies whether the module saw an open, a short to power, a short to ground, or a resistance simply out of range.
The reason this particular loop deserves more urgency than its siblings is what stage 1 does. Multi-stage frontal airbags split inflation across two circuits so the module can match deployment force to the crash: stage 1 provides the base inflation, and stage 2 adds force for higher-severity impacts or for an occupant the module believes is unbelted. Stage 1 fires in essentially every frontal deployment. Stage 2 is an addition. So a fault in the stage 2 loop means an airbag that may deploy with less force than intended, while a fault in the stage 1 loop can mean an airbag that does not usefully deploy at all. Both codes matter; this one has less margin in it.
The second thing that distinguishes this code is a repair-history question worth asking before any testing. The passenger frontal airbag is the single most commonly stolen airbag in the vehicle, and it is also the one most often replaced with something questionable after a collision — a used unit of unknown history, a non-genuine assembly, or, in the worst cases, a cover panel with nothing behind it and the connector left dangling or bridged with a resistor. A stage 1 open circuit on a car that has had front-end damage repaired, or that was bought at auction or from a salvage title, is a strong reason to physically look behind the dash panel rather than to start measuring. That inspection is the whole job in those cases, and it is the one failure mode where the code is telling you something about the vehicle's history rather than about a component wearing out.
Third, this is the airbag that is designed to be switchable off. Vehicles with a key-operated passenger airbag cutoff switch, and vehicles that suppress the bag through the occupant classification system, both have a legitimate state in which the passenger airbag is deliberately disarmed. A deliberate suppression is not a loop fault and does not set this code, but a failing cutoff switch or its wiring can produce circuit conditions the module cannot interpret. On a vehicle with a manual cutoff, exercise the switch through both positions and observe the indicator before condemning anything behind the dash.
Routing matters too. Unlike the driver's airbag, this loop does not pass through a clockspring; it runs across the dash harness to a connector normally behind the glovebox or the lower dash. Glovebox removal, dash-top work and windscreen replacement all put hands near it.
The vehicle drives normally. Restraint circuits must be powered down per the service procedure before anything is disturbed.
Common causes
- Airbag missing, non-genuine, or already deployed behind an intact dash panel after a collision repair or theft
- Firing loop bridged with a resistor or shorting device to hide a missing airbag
- Corroded, backed-out or unlatched connector behind the glovebox or lower dash
- Connector disturbed during glovebox removal, dash-top work or windscreen replacement
- Failing passenger airbag cutoff switch or its wiring on vehicles fitted with one
- Failed inflator squib in the passenger frontal airbag assembly
- Damaged shorting bar in the SRS connector, which should hold the loop shorted when unplugged
- Faulty restraints control module, which should be concluded last
Symptoms
- Airbag / SRS warning light on with the vehicle driving normally
- Stored B0010 with a symptom byte in the restraints module
- Fault present on a vehicle with a salvage history or recent front-end collision repair
- Passenger airbag cutoff switch indicator that does not respond correctly to the key position
- Companion stage 2 or passenger-side restraint codes stored alongside it
- Fault appearing immediately after glovebox, dash or windscreen work
- Dash panel that sits slightly proud or has fastener damage from a previous removal
- No effect on engine or driving performance
Diagnostic steps
- 1.Read the code with its full symptom byte and record every companion restraint code, since the direction of the fault decides where to start.
- 2.Ask about the vehicle's history — collision repair, salvage title, auction purchase, theft — before any testing, because a missing or bogus airbag is the failure mode this code is most associated with.
- 3.With the restraint system safely disabled per the service procedure, remove the dash panel and physically confirm a genuine, undeployed airbag assembly is present and correctly connected.
- 4.Look specifically for a resistor or shorting device fitted in place of the airbag, which some repairs use to extinguish the warning lamp.
- 5.On vehicles with a passenger airbag cutoff switch, operate it through both positions and observe the indicator before condemning the airbag or its wiring.
- 6.Inspect the connector behind the glovebox or lower dash for corrosion, backed-out terminals and a damaged shorting bar.
- 7.Ask whether the glovebox, dash top or windscreen has been worked on recently, since all three put hands close to this loop.
- 8.Measure the deployment loop resistance against the manufacturer's specification, using the approved method and equipment, to separate a wiring fault from a failed inflator.
- 9.If the airbag or module has been replaced, verify the correct part number and that any required programming or configuration was completed.
- 10.After repair, clear the codes and confirm the airbag lamp completes its bulb check and stays out.
Repair cost
$100 – $1,400
A connector repair behind the glovebox is at the low end at $150 to $350 including SRS diagnostic time. A replacement passenger frontal airbag assembly is one of the more expensive restraint parts, commonly $400 to $1,000 for the module itself with dash disassembly on top, and genuine parts are strongly preferred here for a component whose deployment characteristics are calibrated to the vehicle. SRS diagnostic time runs $100 to $200. Where the code turns out to be a missing airbag after a previous repair, budget for the full assembly — and treat it as a safety finding about the vehicle rather than a maintenance item.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with airbag control module (sdm) replacement / reset preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.