When the sensor detects that the voltage in the circuit is too high, it triggers the P0406 code. Diagnose the issue using a scan tool to confirm the P0406 code and pinpoint the exact cause. …

Detailed information on troubleshooting and repairing a P0406 DTC code which has to do with the EGR sensor A circuit high. Also includes links to relevant forum topics on the code.

Aug 13, 2024 · Address the P0406 code by learning about its meaning, possible causes, common symptoms, and more. Read on for more information.

Jan 30, 2025 · What does the P0406 code mean? The P0406 code is a diagnostic trouble code (DTC) that indicates an issue with the Exhaust Gas Recirculation (EGR) sensor. Specifically, …

Learn what Trouble Code P0406 means, the cause, and how to fix it.

The powertrain control module (PCM) triggers the P0404 code when it monitors an issue with the performance of the EGR sensor A. This article explains the P0406 code causes, symptoms, …

Mar 25, 2022 · Check engine light code P0406 means Exhaust Gas Recirculation Sensor “A” Circuit High. Find out how to fix it in this article!

Sep 17, 2025 · Learn all about the P0406 code, what causes Exhaust Gas Recirculation Sensor "A" Circuit High, and how to diagnose and fix common issues to maintain optimal engine …

Jun 20, 2025 · P0406 fault light on? Don't worry! Follow along as we learn what the P0406 code means, the main symptoms, the main causes, and how to fix it.

**Common cause:** Excessively high voltage from the primary EGR sensor, usually due to a shorted sensor, damaged wiring, or internal ECM fault. **First‑step diagnosis:** Scan, verify …