What does P0190 mean?
The fuel rail pressure sensor reads fuel pressure in the rail that feeds the injectors. On diesels and direct-injection gas engines, pressure can run from a few thousand psi to well over 25,000 psi, and the computer controls it closely.
The computer has detected an electrical fault in the sensor circuit.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Hard starting or no start
- Loss of power
- Stalling
Common causes
- Open or shorted wiring
- Corroded or loose connector
- Failed sensor
- Blown fuse or reference voltage issue shared with other sensors
How to diagnose P0190
- Look for other codes that share the same 5 V reference circuit.
- Inspect the connector and wiring, then check reference, ground and signal voltages.
- Replace the sensor only after the wiring tests good.
- Compare commanded and actual rail pressure in live data.
- Check reference, ground and signal at the sensor.
How to fix it
- Repair wiring
- Replace the rail pressure sensor (on some engines it is part of the rail)
Estimated repair cost
Likely repairs for P0190 run from about $100 to $450, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Fuel rail pressure sensor | $150 - $450 |
| Wiring/connector repair | $100 - $400 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0190?
High severity
Can cause stalling or no-start, so fix it before relying on the vehicle.
P0190 FAQ
What does P0190 mean?
P0190 stands for "Fuel Rail Pressure Sensor "A" Circuit". The fuel rail pressure sensor reads fuel pressure in the rail that feeds the injectors.
Can I drive with a P0190 code?
Can cause stalling or no-start, so fix it before relying on the vehicle.
How much does it cost to fix P0190?
It depends on the cause. The likely repairs for P0190 range from about $100 to $450 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0190?
The most common causes are: open or shorted wiring; corroded or loose connector; failed sensor.