What it means
The longitudinal acceleration sensor signal is above the expected range. This can affect stability-control functions that use the sensor.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The longitudinal acceleration sensor reports vehicle acceleration to the stability-control module. C0554 sets when its signal rises above the expected range, which may result from a sensor fault or a signal wire shorted to voltage.
Common causes
Most likely first.
- Faulty longitudinal acceleration sensor
- Signal wire shorted to voltage
- Damaged wiring or poor connector contact
Symptoms
- Stability-control warning light
- Stability control or traction control may be limited
How to diagnose it
- Record freeze-frame data and check live longitudinal acceleration data to confirm the signal is high and see when the fault occurs.
- Inspect the sensor connector and harness for loose or corroded terminals, damaged insulation, and contact with powered wiring.
- Use the vehicle wiring diagram to test the signal circuit for a short to voltage and check the sensor supply and ground.
- Compare signal, supply, and ground readings with the manufacturer's specification to distinguish a circuit fault from a sensor fault.
- If the wiring and supplies pass, test the longitudinal acceleration sensor and check for any vehicle-specific calibration requirement.
Common fixes
- Repair a signal wire shorted to voltage or damaged insulation in the sensor harness.
- Clean or replace damaged connector terminals and secure the connection.
- Correct a sensor supply or ground fault identified during testing.
- Replace the longitudinal acceleration sensor if its signal stays high with a sound circuit and correct supplies.
Can I keep driving?
Stability or traction control may be limited, so drive gently and avoid slippery roads or abrupt manoeuvres. If handling changes or a reduced-function mode appears, stop safely and arrange assistance.
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.