P0401 Code: Complete DIY Repair Guide
The P0401 trouble code is a diagnostic trouble code (DTC) that indicates “Exhaust Gas Recirculation (EGR) Flow Insufficient Detected.” This code is triggered when the engine control module (ECM) detects that the EGR system is not allowing enough exhaust gases to recirculate into the intake manifold. The EGR system plays a crucial role in reducing