Ford
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    EGR Excessive Flow Detected Conditions
Cause:
    Engine running at idle speed (closed loop), then the PCM detected that the signal from the DPFE sensor indicated undesired EGR gas flow (idle speed fault).

Generic
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Exhaust Gas Recirculation "A" Flow Excessive Detected

GM
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Excessive EGR Flow Detected Conditions
Cause:
    No PCM codes set, then the PCM detected that intake manifold pressure was more than a value calculated by PCM during the EGR test with the EGR system commanded on

Nissan
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Exhaust gas recirculation (EGR) system - valve malfunction
Cause:
    Wiring, EGR valve, EGR back pressure transducer, hose leak/blockage, CMP sensor, MAF sensor, EGR/EVAP valve, ECM