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P0401 Diagnostic Trouble Code Discussion for February 2011

Insufficient EGR Flow Detected

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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2002 Ford Escape XLT 3.0L Misfire
P0401: EGR Insuf. Flow. ... I am stumped! As for the P0141 and P0401, it looks like an O2 sensor and DPFE sensor will fix those, but P0304 and P0306 are a different story. This Escape has a misfire under load. This is a new customer so i am not too sure of the history. It does look l...
February 06, 2011
2005 Chevrolet Silverado 3500 6.6L RPM change VIN: 1GCJK33225
P0401: EGR Flow Insufficient Detected. This vehicle was brought in to have a check up as the customer is a little gun shy about losing another engine. The only symptom the customer complained about was an intermittent spike in RPM once or twice a week only lasting for a split second. The APPS is be...
February 10, 2011
2002 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WR52102
P0401: Insufficient EGR Flow Detected. Double check egr tubes both clean into intake manifold, removed throttle plate to check orfice and was clear. Engine stumbles when egr is activated and map volts increase. Tried new egr delco and new map sensor delco / still throws code po401. Pcm calibration ...
February 14, 2011
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5284X
P0401: egr insufficient flow detected. Vehicle came to us as a new owner. Previous owner had new egr installed. Part number checks out as the updated version. It appears to be functioning, as when vacuum is applied, engine dies. Catalytic converter was bad upon arrival, so new one was installed. En...
February 15, 2011