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

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. Inspect the …

Mar 25, 2022 · Engine code P0406 could be caused by a number of things, including a bad EGR valve, faulty wiring, or carbon buildup inside the EGR valve. If you’d like to try to fix code P0406 at home …

What does the P0406 Code mean? P0406 code indicates that your powertrain control module (PCM) detects a high voltage signal from the exhaust gas recirculation (EGR) sensor A.

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 performance.

Jun 20, 2025 · The P0406 fault code indicates a problem with the EGR system, specifically the EGR position sensor. While this problem may seem tricky, most repairs, such as cleaning the EGR …

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.

Diagnosing and fixing a P0406 trouble code isn’t as difficult as it seems, especially with the help of this guide. We also provided its common causes.

Jul 18, 2017 · How do you troubleshoot code P0406 ? Because this DTC describes a circuit problem, you’ll need a vehicle-specific EWD (electrical wiring diagram) and a DMM (digital multimeter) to …

Dec 12, 2023 · When your car shows the P0406 code, it’s telling you there’s a problem with the part that reduces your car’s emissions. This part, called the EGR valve, helps lower pollution from your car.