That's not what this code is about .
P0401 - EGR Flow Insufficient Detected . Probably clogged egr passages .
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.
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