Powertrain, generic · Auxiliary emission controls
P04FA EGR A Control Temperature Too High
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. P04FA is a protective check of the electrically driven EGR valve A (DC motor on an H-bridge with position sensor): the module detects overtemperature or thermal overload of the actuator, modelled from current, actuating work and position behaviour, and limits or switches off EGR. Ford petrol engines from 2020 run it continuously with 4 s to fault above 8.25 V and 400 rpm. Pierburg documents heat damage to VW's 12 V electric EGR valves. EGR then closes, NOx rises.
Likely causes
EGR valve stiff from coking (motor working against resistance)
High thermal load (full load, poor valve cooling, low coolant)
Valve motor or H-bridge driver faulty (overcurrent)
Module software
Symptoms
- Check engine light on
- Rough idle or jerking if the valve hangs
- Loss of power, possibly limp mode
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€150–700
Time1–3 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
egr valveegr valve actuatorengine control module
Related codes
References: fordservicecontent.com, techtips.ie, law.cornell.edu.