What it means
The module compares brake pressure sensor N’s signal with the expected range and pressure behavior. It sets this code when the signal is out of range or does not respond as expected.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
Brake pressure sensor N measures hydraulic pressure for the brake control module’s ABS and stability decisions. This code sets when the module detects an out-of-range N reading or a reading that does not respond as expected to changes in brake pressure.
Common causes
Most likely first.
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Record freeze-frame data and watch live sensor N pressure while applying the brake gently to check whether the reading follows pressure changes.
- Inspect sensor N’s mounting for looseness and check its connector for damage or contamination that could disturb the signal.
- Compare sensor N’s live reading with other available brake pressure data and check for related brake-system codes.
- Inspect the sensor N harness and verify its supply, ground, and signal circuit against the manufacturer's specification.
- If the circuit is sound, test sensor N against actual brake pressure and check mounting or calibration as directed by the manufacturer.
Common fixes
- Secure a loose sensor N mounting or connector.
- Repair damaged sensor N wiring or connector terminals.
- Replace sensor N if it drifts or fails to track pressure with a verified circuit.
- Perform any required manufacturer-specified calibration after repair.
Can I keep driving?
ABS and stability control may be disabled, and brake assist may be reduced. Avoid hard braking and slippery routes until sensor N responds reliably to pressure changes.
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.