C0650Brake Pressure Sensor N Range/Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Sensor N reports a pressure that is electrically valid but disagrees with the commanded or expected value. WABCO's truck EBS runs a matching test: with a defined magnetic flux in the proportional valve a minimum brake pressure must build up at the front axle brakes, or at the valve that controls the trailer, and when the vehicle brakes via pneumatic backup the rear axle must reach a set minimum once the front exceeds a threshold. A Kelsey-Hayes patent avoids a second complete sensor by putting two sensing elements on one diaphragm and flagging a fault when their readings differ beyond a threshold. Neither source uses the code; C0650 and the letter N are not assigned publicly. Causes: drift, valve faults, leaks, air.
- What you may notice
- Warning lamp on after braking
- Pressure control falls back to an emergency mode
- Likely causes
- LikelySensor N reading drifted
- PossibleValve or modulator not building the commanded pressure
- RareLeak or air in the measured circuit
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.