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OBD-II · Engine and powertrain (P)

P0190

Fuel rail pressure sensor circuit fault

What it means

The engine computer detects a fault in the fuel rail pressure sensor circuit, rather than confirming a mechanical fuel pressure fault.

Symptoms

  • limp mode or loss of power
  • possible no start or stalling
  • engine warning light

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01failed rail pressure sensor
02connector corrosion
03open or shorted wiring
04reference voltage or sensor ground fault
05engine computer input fault

What to check, step by step

  1. 01Inspect the sensor connector for corrosion and fuel contamination.
  2. 02Check the 5 V reference, ground and signal with key on.
  3. 03Check engine-off rail pressure only after the OEM pressure-decay conditions are met. Residual pressure can remain after shutdown; verify sensor supply, ground and signal before condemning it, and never loosen a fuel line to check pressure.
  4. 04Replace the sensor if wiring is good (on some rails the sensor is not sold separately).