EV Diagnostics
Source-backed diagnostic reference

P1491 EV diagnostic code

EGR Valve Lift Insufficient Detected

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

  • ACURA: EGR Valve Lift Insufficient Detected Source
  • DODGE: Radiator Fan Control Relay Circuit Open Or Shorted Source
  • HONDA: EGR Valve Lift Insufficient Detected Source
  • INFINITI: EGR Valve Lift Insufficient Detected Source
  • JEEP: Radiator Fan Control Relay Circuit Open Or Shorted Source
  • NISSAN: Vacuum Cut Valve Bypass Valve Source
  • OTHER: Secondary Switch Solenoid Circuit Malfunction Source
  • PLYMOUTH: Radiator Fan Control Relay Circuit Open Or Shorted Source
  • PONTIAC: Radiator Fan Control Relay Circuit Open Or Shorted Source
  • GENERIC: Secondary Switch Solenoid Circuit Malfunction Source

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