• The fault code P0090 indicates that there is an issue with the control circuit or an open circuit in the fuel pressure regulator for the first fuel injector. This may cause the engine to run poorly or not start at all.

Possible Symptoms:

  • Illuminated check engine light

  • Engine may not start

  • Engine runs poorly or stalls

  • Decreased fuel efficiency

  • Hesitation or sluggish acceleration

Possible Causes:

  • Malfunctioning fuel pressure regulator

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed engine control module (ECM)

Related Parts:

  • Fuel Pressure Regulator: Fuel pressure regulator controls the fuel pressure and returns any excess fuel to the tank. Problems lead to engine misfire, poor fuel economy & poor acceleration

Possible Solutions:

  • Replace the fuel pressure regulator

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the engine control module (ECM) if necessary