EV Diagnostics
Source-backed diagnostic reference

P1406 EV diagnostic code

Heated Catalyst Internal Control Module Checksum ROM Error

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

  • BMW: Heated Catalyst Internal Control Module Checksum ROM Error Source
  • BUICK: EGR Valve Pintle Position Circuit Source
  • CADILLAC: EGR Valve Pintle Position Circuit Source
  • CHEVY: EGR Valve Pintle Position Circuit Source
  • CHRYSLER: EGR Valve Pintle Position Circuit Source
  • FORD: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose Source
  • GM: EGR Valve Pintle Position Circuit Source
  • GMC: EGR Valve Pintle Position Circuit Source
  • LINCOLN: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose Source
  • MAZDA: DPFE Sensor Downstream Hose Off Or Plugged Source
  • MERCURY: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose Source
  • OLDSMOBILE: EGR Valve Pintle Position Circuit Source
  • OTHER: Exhaust Gas Recirculation (EGR) Position Sensor Performance Source
  • PLYMOUTH: EGR Valve Pintle Position Circuit Source
  • PONTIAC: EGR Valve Pintle Position Circuit Source
  • SATURN: EGR Valve Pintle Position Circuit Source
  • TOYOTA: Turbo Pressure Sensor Range Performance Problem Source
  • VOLKSWAGEN: EGR Temperature Sensor Range Performance Source

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