OBD II Fault Code

  • OBD II P021F

OBD-II Code Decreased engine performance is defined as a Cylinder 12 Injection Timing

The engine control module (PCM) has special transistors called "drivers" to turn the Fuel Injectors on and off in the Fuel Injection System. If the PCM cannot control the fuel injector, it will set code P021F.

Decreased engine performance Symptoms

  • Decreased engine performance
  • Increased fuel consumption

Common Problems That Trigger the P021F Code

  • Fuel injector failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue

Common Repairs Needed for the P021F Code

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