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 gases back into the …

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 P0401 code causes, …

Learn what the P0401 diagnostic trouble code means and how to troubleshoot insufficient exhaust gas recirculation (EGR) 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, and …

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

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.

May 22, 2025 · Issues within the EGR system can throw off the P0401 OBD-II trouble code. Find out what it means, how it’s diagnosed, and all possible fixes to solve it.

May 30, 2025 · After running a diagnostic scan, one of the most common fault codes is P0401. But what does this code mean? And what should you do about it? This article will walk you through all the …

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.

Apr 14, 2025 · Code P0401 is a generic OBD-II diagnostic trouble code that applies to all vehicles equipped with onboard diagnostics. The code specifically indicates “Exhaust Gas Recirculation …