What it means
The control module monitors the signal from multi-axis acceleration sensor module B and sets this code when the signal is intermittent or changes erratically instead of remaining consistent.
How it works
Multi-axis acceleration sensor module B sends movement data to the stability-control system. This code is set when module B's signal becomes intermittent or erratic, rather than changing consistently with vehicle movement.
Common causes
Most likely first.
- Connector loose
- Connector with intermittent contact under vibration
- Harness routed against vibrating component
Symptoms
- Stability-control warning light on
- Traction or stability control may be limited
How to diagnose it
- Review freeze-frame data and live module B readings for dropouts or sudden jumps, and note when the fault occurred.
- Inspect the module B connector for incomplete latching, corrosion, moisture, or loose terminals.
- Follow the module B harness and check for chafing, tension, or contact with a vibrating or moving component.
- With the vehicle safely stationary, gently move the accessible harness and connector while watching live data for signal interruptions.
- If the fault persists, test module B power, ground, and signal continuity against the manufacturer's specification.
Common fixes
- Reseat and secure the module B connector.
- Clean or repair corroded or loose connector terminals.
- Repair and secure a chafed or poorly routed module B harness.
- Replace module B if its signal remains erratic after connector and wiring faults are corrected.
Can I keep driving?
Stability or traction control may cut out or become unavailable, so drive smoothly and leave extra room, especially on wet or loose surfaces. If warning lights appear with unexpected braking or handling behavior, stop somewhere safe and arrange inspection.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.