P0401
P0401
Description EGR SYSTEM INSUFFICIENT FLOW PCM tests Exhaust Gas Recirculation (EGR) valve by momentarily commanding valve on while monitoring engine MAP. PCM will illuminate MIL and store DTC P0401 if expected increase is not seen under certain conditions during deceleration. You may notice drivability problems such as pinging (knock) when the engine is under load or the vehicle is at higher speeds. Causes
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