Trouble codes › P0190
P0190 Fuel Rail Pressure Sensor "A" Circuit
Fuel and air
P0190 means the engine computer isn't getting a usable signal from the fuel rail pressure sensor.
The engine computer isn't getting a usable signal from the fuel rail pressure sensor, which it needs to control fuel pressure on direct-injection and diesel engines (and some port-injected ones).
The engine may run in a reduced-power backup mode or be hard to start. Drive only if it runs normally, and get it fixed soon.
Common causes
- Damaged wiring or a corroded connector at the rail pressure sensor
- A failed fuel rail pressure sensor
- A 5-volt reference circuit problem shared with other sensors
Symptoms
- Hard starting or long cranking
- Reduced power
- Stalling
What to check first
- Inspect the sensor's connector and wiring on the fuel rail.
- Check the 5-volt reference and ground at the sensor.
- Compare the rail pressure reading with the engine off (should drop toward zero after a while) and running.
- If other 5-volt sensors also have codes, look for a shared reference circuit fault first.
What does P0190 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0190No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0190 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.