DTC P0406: Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High

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P0406 - EXHAUST GAS RECIRCULATION (EGR) SENSOR A CIRCUIT HIGH

Description: The EGR monitor checks the EGR sensor signal to the PCM for high voltage. This DTC sets when the average voltage to the PCM exceeds the maximum calibrated value.
Possible Causes: Differential pressure feedback EGR circuit open VREF circuit short to voltage Damaged differential pressure feedback EGR sensor Differential pressure feedback EGR circuit short to voltage SIGRTN circuit open
Diagnostic Aids: A DPFEGR PID reading greater than 4.5 volts with the ignition ON, engine OFF or running indicates a hard fault.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST HH .