P0190
Fuel Rail Pressure Sensor Circuit
The ECU detects an out-of-range signal from the fuel rail pressure sensor. The voltage is outside calibrated min/max boundaries during normal operation.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Rail pressure sensor failedCommon
- Wiring or connector faultPossible
Parts involved
- Fuel Rail Pressure Sensor
- Wiring Harness
- ECM
P0190 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.