P0401 Code - Meaning, Causes & How to fix it - Mechanic Base
Nov 10, 2025 · In this guide, we cover the meaning of the P0401 trouble code and look at its top causes. We also evaluate how to diagnose it, what might fix it and the average repair cost, so …
P0401 Code Meaning, Causes, Symptoms & Tech Notes
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 …
P0401 Code: Meaning, Symptoms, Causes (& How to Fix it)
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 …
OBD-II Trouble Code: P0401 Insufficient EGR Flow
Information on diagnosing and repairing a DTC trouble code P0401 which is insufficient EGR (exhaust gas recirculation) flow.
P0401 Trouble Code - Diagnosis, Causes, Symptoms & How to ... - AutoZone
Learn what the P0401 diagnostic trouble code means and how to troubleshoot insufficient exhaust gas recirculation (EGR) flow.
P0401 Code: EGR Flow Issue (Symptoms, Causes, and How to Fix)
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, …
P0401 Code Explained: 6 Symptoms, Causes & Pro Fixes to Save …
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.
Fix P0401: Mechanic’s solutions that WORKED - Iamcarhacker
Oct 25, 2023 · I looked into P0401 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you …
P0401: EGR Flow Insufficient – Symptoms, Causes & Fixes
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.
Code P0401: EGR Flow Insufficient – Causes, Symptoms, and Fixes
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 …