Faulty fuel rail pressure sensor; Short to ground in the sensor signal circuit; Open or high-resistance ground circuit at the sensor; Corroded, loose, or damaged sensor connector or terminals; Low actual fuel pressure due to a weak high-pressure fuel pump or clogged filter; PCM internal fault (rare)

DTC codes / P01xx · Fuel and air metering / P0192

P0192Fuel Rail Pressure Sensor Circuit Low Input

Q: What does code P0192 mean?

Fuel Rail Pressure Sensor Circuit Low Input. P0192 means the powertrain control module (PCM) has detected a fuel rail pressure sensor signal voltage that is lower than the expected range for the current operating conditions. The sensor normally outputs a voltage that rises with fuel pressure, so a low input tells the PCM the rail pressure is abnormally low or the circuit is shorted to ground.

P0192 means the powertrain control module (PCM) has detected a fuel rail pressure sensor signal voltage that is lower than the expected range for the current operating conditions. The sensor normally outputs a voltage that rises with fuel pressure, so a low input tells the PCM the rail pressure is abnormally low or the circuit is shorted to ground.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Engine cranks but stalls immediately or fails to start
Rough idle, misfire, or hesitation during acceleration
Reduced engine power or limp mode
Poor fuel economy or black smoke from the exhaust
Hard starting, especially when cold

Common causes, most likely first

Faulty fuel rail pressure sensor
Short to ground in the sensor signal circuit
Open or high-resistance ground circuit at the sensor
Corroded, loose, or damaged sensor connector or terminals
Low actual fuel pressure due to a weak high-pressure fuel pump or clogged filter
PCM internal fault (rare)

How to diagnose and fix it

Connect a scan tool and read live fuel rail pressure data to compare the sensor reading with actual mechanical pressure
Visually inspect the sensor connector and wiring for corrosion, chafing, or loose pins
Measure sensor reference voltage (typically 5V) and ground circuit integrity with a digital multimeter
Check the signal wire for a short to ground by measuring resistance to chassis ground with the sensor disconnected
Test the fuel rail pressure sensor with a multimeter or oscilloscope to confirm it responds correctly to pressure changes
Verify actual fuel pressure with a mechanical gauge; if low, diagnose the high-pressure fuel pump and filter
Replace the faulty sensor or repair the wiring as needed, then clear codes and verify the repair with a road test

Don't overlook the low-pressure side

A weak in-tank low-pressure fuel pump can cause P0192 even when the rail pressure sensor and wiring test perfectly, because the high-pressure pump cannot build sufficient rail pressure from a starving supply.
The sensor's ground circuit is just as important as the signal wire; a poor ground will pull the signal voltage low and set this code without any short in the signal wire itself.
Many technicians replace the fuel rail pressure sensor only to find the connector terminals are spread or corroded, so always perform a drag test on the pins before condemning the sensor.
P0192 can be set by a completely different fault, such as a stuck-open fuel injector or a failed fuel pressure regulator, which drops actual rail pressure and makes the sensor report low.
On some vehicles, a low battery or charging system fault can cause the PCM to misread sensor inputs, so check system voltage before diving into fuel pressure diagnostics.

Can I keep driving with P0192?

Do not continue driving with P0192 because the engine may stall without warning or enter limp mode, creating a safety risk. Have the vehicle towed to a repair shop for proper diagnosis and repair.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.