What it means
Brake pressure sensor N signal voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
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 reports hydraulic pressure to the brake control module for ABS and stability control. This code sets when the sensor N signal rises above the module’s expected electrical range, which can happen if the signal is shorted to battery voltage.
Common causes
Most likely first.
- Signal wire shorted to battery
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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 observe live sensor N pressure to confirm that its signal is unusually high or fixed high.
- Inspect sensor N’s connector and harness for corrosion, water entry, pin damage, or wiring pinched against a power source.
- Move the sensor N harness gently while monitoring live data to check whether the high reading changes with harness position.
- Use the wiring diagram to test the sensor N signal circuit for a short to battery and check supply and ground against the manufacturer's specification.
- If the circuit is not shorted, test sensor N and the control-module input using the manufacturer's procedure.
Common fixes
- Repair a sensor N signal wire shorted to battery voltage.
- Clean and secure corroded or loose sensor N connector terminals.
- Replace a damaged connector or repair wiring pinched against a power source.
- Replace sensor N if the circuit tests correctly but its output remains high.
Can I keep driving?
ABS and stability control may be disabled, and brake assist may be reduced, so leave extra stopping distance and avoid hard braking. Stop driving if braking response 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.