P0191 Code 5.9 Cummins

P0191 Fuel Rail Pressure Sensor Circuit Range

Possible causes for this code:

  • Low fuel rail pressure (check fuel filter)
  • Failing fuel pressure sensor
  • Dirty fuel pressure sensor contacts
  • Damaged wiring from or to the fuel pressure sensor


See my tuning in action…

High Altitude 12 Valve Tune Cold Start

An early version of my towing tune…