Powertrain, generic · Auxiliary emission controls
P04DA Closed Loop EGR Control At Limit - Flow Too High
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo
Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. P04DA is the counterpart of P04D9: the control cannot lower the flow far enough even at the end of its range. CARB requires this for petrol engines from model years 2019–21 and for diesels. Ford's 6.7-litre diesel sets it when the desired minus the measured EGR rate stays below −60 points for 20 s with EGR in closed loop. Too much exhaust in the cylinder causes soot, rough running and, on petrol engines, misfire up to stalling at idle.
Likely causes
EGR valve not closing (soot at the seat, stuck open)
Air mass meter reading too little fresh air (EGR rate calculated too high)
Position or EGR temperature sensor giving a wrong value
Intake or exhaust throttle wrong (pressure difference too large)
Symptoms
- Check engine light on
- Rough idle, jerking
- Smoke or soot (diesel), possibly stalling at idle (petrol)
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€150–1,200
Time1–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
egr valveegr controlmaf sensorengine control module
Related codes
References: fordservicecontent.com, law.cornell.edu.