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Exhaust gas recirculation (EGR)

P0405 Exhaust Gas Recirculation (EGR) Sensor A Circuit Low

The ECU monitors the voltage of the EGR position or feedback sensor. P0405 is set when the signal stays below the minimum expected voltage for a specified time.

Common causes

  • Signal wire shorted to ground
  • Open reference voltage circuit
  • Faulty EGR position sensor, often integrated in the EGR valve
  • Corroded or damaged connector

Typical symptoms

  • Check engine light (MIL) on
  • EGR operation disabled by the ECU
  • Rough idle or reduced performance on some vehicles

P0405 and NuoVolta

When the EGR valve and its sensor have been removed for off-road or motorsport use, where permitted by law, the NuoVolta EGR Removal solution adjusts the ECU calibration and the DTC removal feature can disable this code. Otherwise, check the sensor supply, ground and signal wiring first.

EGR Removal Available for 256 ECUs

Related codes

P0400Exhaust Gas Recirculation (EGR) Flow Malfunction P0401Exhaust Gas Recirculation (EGR) Flow Insufficient Detected P0402Exhaust Gas Recirculation (EGR) Flow Excessive Detected P0403Exhaust Gas Recirculation (EGR) Control Circuit Malfunction P0404Exhaust Gas Recirculation (EGR) Circuit Range/Performance P0406Exhaust Gas Recirculation (EGR) Sensor A Circuit High

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.