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DTC P0400: Exhaust Gas RECIRCULATION (EGR) Flow

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
P0400 - EXHAUST GAS RECIRCULATION (EGR) FLOW

Description:  The electric EGR (EEGR) system is monitored once per drive cycle at high and low load conditions. The test fails when a concern is detected by powertrain control module (PCM) calculations indicating the EGR flow is less or greater than expected.
Possible Causes: 
  • EEGR valve stuck open or closed
  • EEGR connector not seated correctly
  • EEGR motor windings short or open
  • No voltage to the EEGR
  • Harness open or short to voltage or ground
  • Vacuum signal to manifold absolute pressure (MAP) restricted or leaking
  • Mass air flow (MAF) sensor signal erroneous
  • Carbon build up in the EEGR valve seat area
  • One or more sensors is not responding or is out of range
Diagnostic Aids:  All of the following sensors input data to the PCM for correct operation of the EEGR system: cylinder head temperature (CHT) sensor, intake air temperature (IAT) sensor, MAF, throttle position (TP) sensor, MAP sensor. Resolve any DTC relating to these sensors prior to addressing this DTC.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST KD .
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