P02E4

Diesel Intake Air Flow A Control Stuck Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced engine power
Increased fuel consumption
Rough idling
Black smoke from the exhaust pipe

Causes

Sticking Exhaust Gas Recirculation (EGR) Valve
Malfunction of the solenoid valve (solenoid)
Open or shorted wiring harness
Mechanical damage to the damper
Problems with the ECU

How to Fix

Check the operation of the EGR valve and its electrical connections
Inspect the wiring harness for damage
Check the resistance and operation of the solenoid
Clean or replace the flapper/valve if dirty or damaged
Reset error and test drive

Related codes

P0401 P0402 P0403