P0401 insufficient egr flow technical description insufficient exhaust gas recirculation egr flow what does that mean this diagnostic trouble code dtc is a generic powertrain code which means that it applies to obd ii equipped vehicles. What does obd ii fault code p0401 mean obd ii code p0401 is defined as a insufficient egr flow p0401 symptoms check engine light will illuminate in most cases there are no adverse conditions noticed by the driver. The obdii fault code p0401 means that the engine computer has detected that the exhaust gas recirculation egr system flow is insufficient the egr system redirects a small amount of exhaust gases back into the intake. P0401 code definition exhaust gas recirculation flow insufficient detected what the p0401 code means p0401 is an obd ii generic code that the engine control module ecm detected the engine exhaust gas recirculation egr valve is not flowing enough recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold. Obd codes home welcome to our obd codes home where you can find codes for all of your car and trucks we currently have a lot of honda codes and do have a standard obd ii code list so select your obd on the right in the menu and everything is organized there
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