![]() ![]() The EGR system is important because it reduces emissions by allowing burnt exhaust gas to flow back into the engine. Usually on an OBD2 system that sets the P0401, the ECM/PCM must see the failure on two consecutive trips before it will permanently set the code and trigger the Check Engine Light. If by looking at the feedback loop (whatever it may be on the system in question), if the ECM/PCM determines there is insufficient EGR flow, it will set the OBD-II code P0401. What Does the P0401 Code Mean?ĭiagnostic trouble code (DTC) P0401 stands for “Exhaust Gas Recirculation (EGR) Flow Insufficient Detected.” This code means that the computer detects insufficient exhaust gas recirculation (EGR) flow in the system. Code P0401 means that the computer detects insufficient exhaust gas recirculation (EGR) flow in the system.
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