The P0401 code indicates that the exhaust gas recirculation (EGR) system is not flowing as expected. The EGR system is responsible for redirecting a portion of the engine's exhaust …

Information on diagnosing and repairing a DTC trouble code P0401 which is insufficient EGR (exhaust gas recirculation) flow.

Feb 10, 2025 · Though well-designed, EGR systems still have issues and trouble code P0401 is sometimes a result. This article will go over the common causes of a P0401 code, its severity, …

An OBD-II scanner error code P0401 problem comes with its own set of symptoms and underlying causes. Fortunately, interpreting this code can also provide some clear guidance on how to fix …

2 days ago · What triggers P0401? Learn the meaning of this common EGR code, discover why your flow is restricted, and get the complete guide to diagnosis and repair.

May 27, 2025 · Learn what DTC P0401 means, its common causes, symptoms, and how to fix “EGR Flow Insufficient” issues. Practical guide for diesel truck owners and DIYers.

When the EGR system doesn’t recirculate exhaust gases according to the requirements, the powertrain control module triggers the trouble code P0401. This article mainly explains the …

This guide explains the P0401 code’s meaning, symptoms, causes, and step-by-step diagnostics to fix it like a pro—potentially saving you $600-$1,200 from overpriced EGR system repairs.

Oct 6, 2025 · Learn what the P0401 “EGR flow insufficient” code means, common causes, and how to fix it. Find out repair costs and how to clear the code for good.

Nov 14, 2024 · What does the P0401 error code mean? The P0401 error code stands for "Exhaust Gas Recirculation (EGR) Flow Insufficient Detected."