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Old 05-21-2007, 11:03 AM   #1
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So the check engine light keeps comming on: P0401. I've replaced the EGR valve and EGR solenoid (sp?) twice and it still keeps "missing". Anything below 40mph or 3500 rmp and it feels like you are running out of gas. I read there is the EGR sensor on some models, but I haven't been able to locate it. Any help would be greatly appreciated.

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Old 05-21-2007, 11:41 AM   #2
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FUEL RAIL PRESSURE SENSOR... same problem cured...
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Old 05-21-2007, 11:48 AM   #3
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P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum. Vacuum supply
EGR valve stuck closed
EGR valve leaks vacuum
EGR flow path restricted
EGRVR circuit shorted to PWR
VREF open to D.P.F. EGR sensor
D.P.F. EGR sensor downstream hose off or plugged
EGRVR circuit open to PCM
VPWR open to EGRVR solenoid
D.P.F. EGR sensor hoses both off
D.P.F. EGR sensor hoses reversed
Damaged EGR orifice tube
Damaged EGRVR solenoid
Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents.

P1408 - EGR Flow Out of Self-Test Range (Non MIL) This test is performed during the KOER on demand self-test only. The EGR system is commanded ON at a fixed engine speed. The test fails and the DTC is output when the measured EGR flow falls above or below the required calibration . For vacuum activated systems see Possible Causes for DTC P0401.For electric motor system see Possible Causes DTC P0400. For Electric EGR, use the output state control function of the scan tool and monitor the MAP PID (MAP) and the EEGR PID (EGRMDSD) while commanding the EEGR on. If EGR is introduced into the engine at idle, the rpm will drop or stall out. For vacuum systems see Diagnostic Aids for P0401.
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