EV Diagnostics
Source-backed diagnostic reference

P1231 EV diagnostic code

Injector Circuit Cylinder 4 Intermittent

Reference status: This page preserves source-backed code definitions for discovery. Manufacturer/model applicability, repair steps and safety conclusions are not treated as verified unless a manufacturer-specific verified report is available.

Reference definitions

  • BUICK: Injector Circuit Cylinder 4 Intermittent Source
  • CADILLAC: Injector Circuit Cylinder 4 Intermittent Source
  • CHEVY: Injector Circuit Cylinder 4 Intermittent Source
  • CHRYSLER: Injector Circuit Cylinder 4 Intermittent Source
  • FORD: High Speed Fuel Pump Relay Activated Source
  • GM: Injector Circuit Cylinder 4 Intermittent Source
  • GMC: Injector Circuit Cylinder 4 Intermittent Source
  • LINCOLN: High Speed Fuel Pump Relay Activated Source
  • MERCURY: High Speed Fuel Pump Relay Activated Source
  • OLDSMOBILE: Injector Circuit Cylinder 4 Intermittent Source
  • OTHER: Fuel Pump Secondary Circuit Low, High Speed Source
  • SATURN: Injector Circuit Cylinder 4 Intermittent Source
  • VOLKSWAGEN: Cylinder 7 Injector Circuit Short To Ground Source

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