P042F

EGR A Control Stuck Closed

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Increased NOx emissions
Engine knock
Reduced engine power

Causes

Mechanical jamming of the EGR valve
EGR solenoid malfunction
Open or shorted wiring harness
ECU software error

How to Fix

Check the mechanical condition of the EGR valve
Check the operation of the EGR solenoid
Check the integrity of the wiring harness
Clean or replace EGR valve
Update ECU firmware if necessary

Related codes

P0401 P0402 P0403 P0404