P0192Fuel Rail Pressure Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The rail pressure sensor A measures the pressure in the high-pressure fuel rail of common-rail diesels and petrol direct-injection engines; it is either a three-wire sensor (5 V reference, ground, signal rising with pressure, about 0.5 V at 0 bar) or a digital SENT sensor with two measuring channels. The engine module uses it as the feedback signal for rail pressure control. P0192 means the signal is below the physically possible range – typically a signal wire shorted to ground or an open 5 V reference. Limits: Ford diesel below 0.13 V for 0.5 s, Ford petrol direct injection below 0.20 V for 5 s, GM diesel below 4.3 % of supply, GM 6.6 litre below 0.19 V, Saab/GM 2.0 diesel below 0.25 V. Monitored continuously; GM one trip, Saab two. If several sensors report low voltage at once, the shared 5 V reference is the likely cause. On a fault the module uses a substitute value and usually limits power.
- What you may notice
- Check engine light on
- Limp mode or 'Reduced Engine Power'
- Hard starting, stalling
- Rough running
- Likely causes
- LikelySignal wire shorted to ground, harness chafed
- Possible5 V reference open or shorted
- PossibleConnector corroded or loose
- PossibleRail pressure sensor faulty internally
- RareEngine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.