Faulty fuel rail pressure sensor (both sources). Sensor signal wire shorted to the sensor ground (signal return) or power ground (OBD-Codes.com). Damaged wiring or a poor connection at the sensor (RepairPal lists wiring issues). PCM failure (RepairPal; OBD-Codes.com says it can't be ruled out until the sensor has been replaced). RepairPal lists fuel pump replacement as a common repair for this code.

Repair a shorted signal wire or a corroded or loose connector. Replace the fuel rail pressure sensor (on some engines it is part of the fuel rail, per OBD-Codes.com). Replace the fuel pump if testing shows truly low pressure (RepairPal lists this as a common repair).

P0192⛽ Fuel / fuel rail pressure sensorStop and fix promptly

P0192: Fuel Rail Pressure Sensor Circuit Low (Meaning, Causes, Fixes)

Q: What does P0192 mean?

P0192 means the engine computer is getting a fuel rail pressure sensor signal that reads too low. OBD-Codes.com points mainly to the sensor itself or its signal wire shorted to ground, while RepairPal also lists wiring, the PCM, and names the fuel pump as the common repair. Check the connector and wiring first, then test the sensor circuit before buying parts. The fuel rail pressure (FRP) sensor tells the engine computer (PCM) how much pressure is going to the fuel injectors, so it can meter the right amount of fuel for power and fuel economy. OBD-Codes.com says P0192 sets when the sensor's signal falls below a calibrated limit for a calibrated amount of time, and that it is a generic code for most fuel-injected engines, gas and diesel, since about 2000. It can be a mechanical or an electrical fault depending on the vehicle and fuel system. The two sources describe it a little differently: OBD-Codes.com treats it strictly as a low-signal circuit fault (the signal shorted to the sensor ground or power ground, or a damaged sensor), while RepairPal describes the trigger as an erratic signal from the sensor and lists a fuel pump replacement as the common repair, which suggests actual low fuel pressure on some vehicles. A real pressure test tells you which applies to your car.

Q: Can I keep driving with P0192?

Stop and fix promptly. RepairPal puts P0192 in its urgent category, meaning action is needed right away because it can cause severe damage or put the people in the car at risk. OBD-Codes.com lists lack of power and an engine that cranks but won't start, and RepairPal lists decreased engine performance. Losing power in traffic is dangerous, so get it diagnosed promptly, and have it towed if the engine won't start or loses power badly. Diesel common-rail systems run extremely high fuel pressure, so do not open or loosen anything on the fuel rail yourself.

Reviewed 2026-10-25 · Based on 2 cited source(s)

What P0192 means

The fuel rail pressure (FRP) sensor tells the engine computer (PCM) how much pressure is going to the fuel injectors, so it can meter the right amount of fuel for power and fuel economy. OBD-Codes.com says P0192 sets when the sensor's signal falls below a calibrated limit for a calibrated amount of time, and that it is a generic code for most fuel-injected engines, gas and diesel, since about 2000. It can be a mechanical or an electrical fault depending on the vehicle and fuel system. The two sources describe it a little differently: OBD-Codes.com treats it strictly as a low-signal circuit fault (the signal shorted to the sensor ground or power ground, or a damaged sensor), while RepairPal describes the trigger as an erratic signal from the sensor and lists a fuel pump replacement as the common repair, which suggests actual low fuel pressure on some vehicles. A real pressure test tells you which applies to your car.

Severity: can I keep driving?

Stop and fix promptly

RepairPal puts P0192 in its urgent category, meaning action is needed right away because it can cause severe damage or put the people in the car at risk. OBD-Codes.com lists lack of power and an engine that cranks but won't start, and RepairPal lists decreased engine performance. Losing power in traffic is dangerous, so get it diagnosed promptly, and have it towed if the engine won't start or loses power badly. Diesel common-rail systems run extremely high fuel pressure, so do not open or loosen anything on the fuel rail yourself.

Common symptoms

Check engine light on (OBD-Codes.com)
Lack of power or decreased engine performance (both sources)
Engine cranks but won't start (OBD-Codes.com)
Increased fuel consumption (RepairPal)

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

Faulty fuel rail pressure sensor (both sources)
Sensor signal wire shorted to the sensor ground (signal return) or power ground (OBD-Codes.com)
Damaged wiring or a poor connection at the sensor (RepairPal lists wiring issues)
PCM failure (RepairPal; OBD-Codes.com says it can't be ruled out until the sensor has been replaced)
RepairPal lists fuel pump replacement as a common repair for this code

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

Look up technical service bulletins (TSBs) for your year, make, model and engine (OBD-Codes.com).
Find the fuel rail pressure sensor and inspect its connector and wiring for chafing, bare wires, burn marks, melted plastic or corroded (green) terminals. Clean corroded terminals with electrical contact cleaner and add dielectric grease (OBD-Codes.com).
If the sensor has a vacuum hose to the intake manifold, check it for leaks. OBD-Codes.com says fuel coming out of that hose means the sensor is defective.
Clear the code with a scan tool and see if it returns. If it doesn't, the connection was likely the problem (OBD-Codes.com).
If your scan tool shows live data, watch the fuel rail pressure reading. A shop can confirm actual pressure with a gauge; fuel is under pressure and flammable, so skip that test if you are not set up for it.

Typical fixes

Repair a shorted signal wire or a corroded or loose connector
Replace the fuel rail pressure sensor (on some engines it is part of the fuel rail, per OBD-Codes.com)
Replace the fuel pump if testing shows truly low pressure (RepairPal lists this as a common repair)

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

OBD-Codes.com's circuit test: unplug the sensor and use a fused jumper to connect the 5 V supply wire to the signal wire. The scan tool should then read close to 5 V, or P0193 should set. If so, the wiring and PCM are good and the sensor is the likely fault. This needs a wiring diagram for your vehicle.
On diesel common-rail engines, OBD-Codes.com warns rail pressure is at least about 2,000 psi at warm idle and can exceed 35,000 psi under load; a leak can cut skin and cause blood poisoning, so have a professional replace the sensor
If the circuit tests good and a new sensor doesn't fix it, the PCM may be at fault (both sources list it)

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Does P0192 mean my fuel pressure is actually too low?

Not necessarily. The code only says the sensor signal reads low. OBD-Codes.com lists electrical causes (a signal wire shorted to ground or a bad sensor), while RepairPal names fuel pump replacement as a common repair, which points to real low pressure on some vehicles. A pressure gauge test settles it.

Can I drive with P0192?

RepairPal rates it urgent, and OBD-Codes.com lists lack of power and a crank-no-start. Limit driving and get it checked soon; tow it if the engine won't start or loses power.

How do I tell a bad sensor from a wiring problem?

OBD-Codes.com's fused-jumper test: connect the 5 V supply wire to the signal wire at the unplugged sensor connector. If the scan tool then reads close to 5 V (or P0193 sets), the wiring and PCM are fine and the sensor is the likely cause.

Sources

Last reviewed 2026-10-25. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.