EV Diagnostics
Source-backed diagnostic reference

P1278 EV diagnostic code

Accelerator Pedal Position Sensor 1 Circuit High Voltage

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: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • CADILLAC: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • CHEVY: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • CHRYSLER: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • FORD: Cylinder #8 High To Low Side Open Source
  • GM: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • GMC: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • LINCOLN: Cylinder 8 High To Low Side Open Source
  • MERCURY: Cylinder 8 High To Low Side Open Source
  • OLDSMOBILE: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source
  • OTHER: Cylinder #8 High To Low Side Open Source
  • SATURN: Accelerator Pedal Position Sensor 1 Circuit High Voltage Source

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