What does it mean?
B2225 is a Body (airbags, seat belts, body electronics) fault code. It indicates: (SCM) Steering Column Module Internal .
Symptoms
- The air bag warning lamp stays on from key on and never goes out.
- Front air bags and pretensioners are disabled while the code is active.
- The code returns immediately after clearing, or comes back on the first drive over rough road.
- The fault appears right after front end repair, bumper removal or a minor front impact.
- Other restraint codes for the same sensor circuit are stored alongside it.
Likely causes
- Loose, missing or under torqued sensor mounting bolt, often after front end collision repair.
- Bent, cracked or corroded mounting bracket, or a sensor bolted to a repaired panel that no longer transmits impact energy correctly.
- Sensor fitted in the wrong orientation or in the wrong position on the vehicle.
- Rust and paint build up between the sensor body and the mounting face, spoiling the mechanical coupling and the ground path.
- A non matching replacement sensor whose calibration does not suit the mounting location.
- Internal accelerometer bias fault inside the sensor detected during the mounting plausibility self test.
- On some vehicles this code number is used for an internal steering column module fault instead.
How to fix it
- Switch the ignition off, disconnect the battery and wait the specified stand down time before touching any restraint component.
- Read all restraint codes and note which sensor and which side the module is complaining about.
- Inspect the sensor mounting point physically: check bolt torque, bracket condition, corrosion, deformation and repair work behind the bumper.
- Clean the mounting face down to bare metal where required so the sensor sits flat and grounds properly, then torque the fastener to specification.
- Verify the fitted sensor part number and orientation match what the vehicle requires and that it is in the original location.
- Check the sensor connector and harness for damage, water and pin corrosion before condemning the sensor.
- Reconnect the battery, clear the codes and confirm the lamp completes a normal self test; replace the sensor only if the mounting and wiring are proven correct.