EV Diagnostics
Source-backed diagnostic reference

P1257 EV diagnostic code

Supercharger System Overboost

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: Supercharger System Overboost Source
  • CADILLAC: Supercharger System Overboost Source
  • CHEVY: Supercharger System Overboost Source
  • CHRYSLER: Supercharger System Overboost Source
  • FORD: Pedal Correlation PDS2 and HPDS Source
  • GM: Supercharger System Overboost Source
  • GMC: Supercharger System Overboost Source
  • LINCOLN: Pedal Correlation PDS2 and HPDS Source
  • MERCURY: Pedal Correlation PDS2 and HPDS Source
  • OLDSMOBILE: Supercharger System Overboost Source
  • OTHER: Pedal Correlation PDS2 and HPDS Source
  • SATURN: Supercharger System Overboost Source
  • VOLKSWAGEN: Engine Coolant System Valve Open Source

Search and canonical URL

Capitalization, underscores, hyphens, colons and spaces are normalized to this canonical code identity so alternate scan-tool formats do not create duplicate pages.