Air Bag Passenger Circuit Short to Ground - Loop #2
The passenger airbag circuit is detecting a short to ground, similar to a wire touching metal when it shouldn't, causing the airbag system to disable itself as a safety measure. This fault prevents the passenger airbag from deploying in a crash.
The airbag control module continuously monitors the passenger airbag circuit resistance and voltage levels. It detects abnormal low resistance when the circuit shorts to ground, which should normally measure within a safe impedance range. The module triggers a fault when resistance drops below threshold, indicating an electrical short rather than normal circuit operation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Resistance | 4-12 ohms (nominal load) | Below 2 ohms or shorted to ground |
| Circuit Voltage | 5-12 volts (supply dependent) | Drops to 0-1 volt (shorted condition) |
Code B2229 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2229 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.