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Exhaust gas recirculation (EGR)

P0406 Exhaust Gas Recirculation (EGR) Sensor A Circuit High

The ECU monitors the voltage of the EGR position or feedback sensor. P0406 is set when the signal stays above the maximum expected voltage for a specified time.

Common causes

  • Signal wire shorted to voltage
  • Open sensor ground circuit
  • Faulty EGR position sensor
  • Damaged connector or water ingress

Typical symptoms

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

P0406 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 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 P0405Exhaust Gas Recirculation (EGR) Sensor A Circuit Low

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.