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P0402

Overview

Code

P0402

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0402 indicates excessive EGR flow detected

Symptoms

Rough idle; Engine stalling

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 flow regulation

Possible Causes

EGR valve stuck open

Diagnostic Steps

1 Inspect EGR valve position; 2 Test control solenoid

Drive Safety Notes

Engine may stall at idle

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