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P0406

Overview

Code

P0406

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0406 indicates high input from the EGR position sensor

Symptoms

Check Engine Light illuminated; Poor acceleration

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

EGR valve position feedback and emissions control

Possible Causes

Wiring short to voltage; Faulty sensor; EGR valve sticking

Diagnostic Steps

1 Inspect wiring for shorts to voltage; 2 Test sensor output; 3 Inspect EGR valve; 4 Replace sensor if faulty

Drive Safety Notes

EGR system may not function properly

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