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OBD II Fault Code

  • OBD II P2666

OBD-II Code Decreased engine performance is defined as a Fuel Shutoff Valve "B" Control Circuit Low

The Fuel Pressure Relief valve is designed to release excessive fuel pressure. When the engine control module (PCM) detects an issue with the Fuel Pressure Relief Valve signal, the PCM will set code P2666.

Decreased engine performance Symptoms

  • Decreased engine performance
  • Engine may stall
  • Increased fuel consumption

Common Problems That Trigger the P2666 Code

  • Fuel shut-off valve failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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