P0192: Fuel Rail Pressure Sensor Circuit Low Input
Quick Answer
Not safe to drive
P0192 means the signal from the fuel rail pressure sensor has dropped below the lowest voltage the engine computer accepts. The sensor itself, its plug or its wiring is the usual cause, because the code is about the electrical signal rather than about the pressure. It is set mainly on diesel and direct-injection petrol engines, where the computer needs the rail pressure reading to meter fuel. With a bad signal the engine often runs on default values, with less power, or cuts out.
- Severity
- High · Fuel System
- Estimated repair cost
- From €45 to €220+, varies by vehicle
€45 or €220, depending on your car.
- Clean and reseat the sensor connector, repair a corroded pin€45–€150
- Replace fuel rail pressure sensor€60–€220
A scan shows whether P0192 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P0192 mean?
P0192 is a fuel system-related diagnostic trouble code classified as high severity.
What are the symptoms of P0192?
- Check engine light on
- Reduced power or limp mode
- Sudden cut-outs or stalling, sometimes intermittent
- Hard starting or long cranking
- Rough running or surging
- P0193 stored at other times if the signal also swings high
What causes P0192?
Failed fuel rail pressure sensor
: high
Melted, corroded or loose sensor connector
: high
Signal wire shorted to ground or to the sensor's return wire
: medium
Open or high-resistance return wire
: medium
Sensor reference voltage missing because of a wiring or engine computer fault
: low
Real fuel supply problem that makes the real rail pressure very low
: low
Is it safe to drive with P0192?
No - address this immediately. The engine may carry on in a reduced mode, but it can also lose power or cut out without warning because the computer cannot see the real rail pressure. Drive gently to a workshop, avoid overtaking and motorway speeds, and stop safely if it starts cutting out. If the car stalls or will not restart, have it towed.
How do you diagnose P0192?
- Read all stored codes and the freeze frame. If P0193, a pump code or a low-pressure code is also stored, note it, because it changes which part is suspected.
- With the engine running, look at the rail pressure reading on a scan tool if the car reports it. A reading stuck at zero or at the minimum while the engine runs suggests a signal fault.
- Unplug the sensor and inspect the plug for heat damage, corrosion, oil and loose pins. A melted or discoloured plug is a clear sign of the cause.
- Check the three wires with the plug off and the ignition on. A typical sensor has a 5 volt supply, a signal wire and a return wire. Compare readings with the workshop data for the engine, as pin layouts differ between models.
- Look for a short of the signal wire to ground or to the return wire, and for an open or high-resistance return wire, by testing continuity with the battery disconnected.
- Make sure the right plug goes to the right sensor. Some engines have look-alike three-pin connectors close together that can be swapped during a repair.
- If the wiring tests good, replace the sensor, clear the code and road-test. A generic OBD2 reader shows the code and standard pressure data where supported, but it cannot compare desired and actual rail pressure on most cars, which is what separates a sensor fault from a pump fault.
How much does P0192 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Clean and reseat the sensor connector, repair a corroded pin | €5–€30 | €40–€120 | €45–€150 | Moderate |
| Replace fuel rail pressure sensor | €30–€130 | €30–€90 | €60–€220 | Moderate |
| Repair sensor wiring or fit a new plug | €10–€40 | €60–€180 | €70–€220 | Moderate |
| Replace fuel filter (if real low pressure is found) | €20–€60 | €40–€100 | €60–€160 | Moderate |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P0192 on specific vehicles
Saab
Saab 9-5 (2.0 diesel)
2010-2011
Saab's workshop information for the four-cylinder diesel sets this code when the rail pressure sensor signal stays below about 0.25 volts for half a second. Its test steps check the sensor's low reference, 5 volt supply and signal wire before the sensor or engine computer is replaced.
Source: saabwisonline.com
Related diagnostic codes
Common questions about P0192
- What does P0192 mean?
- P0192 means the electrical signal from the fuel rail pressure sensor is lower than the engine computer allows. The fault is in the sensor circuit: the sensor, its plug or its wiring. It does not by itself prove that the fuel pressure is low.
- Is P0192 the same as low fuel pressure?
- No. P0087 reports that the real pressure is too low. P0192 reports that the sensor's signal is too low. A very low pressure can also produce a low signal, but the sensor and wiring are the more common cause.
- Can I drive with P0192?
- Briefly and gently, to a workshop. Without a good pressure signal the computer uses default values, so power may drop or the engine may cut out. Avoid overtaking and fast roads, and stop if it starts cutting out.
- Why does P0192 come and go?
- An intermittent plug or wire, such as a loose pin or a chafed wire, can break contact when the engine moves or warms up. That is why the code sometimes clears and returns. Wiggle-testing the plug and wires finds many of these.
- Should I replace the high-pressure pump for P0192?
- Not first. The code is about the sensor signal, and replacing a pump on a guess is expensive. Test the sensor circuit and compare real and expected pressure before going near the pump.
Read our detailed guides
Sources
- saabwisonline.com saabwisonline.com/9-5-9650/2011/2-engine/engine-management-and-fuel-system-4-cyl