P04FAEGR A Control Temperature Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Rough idle or jerking if the valve hangs
- Loss of power, possibly limp mode
- Likely causes
- LikelyEGR valve stiff from coking (motor working against resistance)
- PossibleHigh thermal load (full load, poor valve cooling, low coolant)
- PossibleValve motor or H-bridge driver faulty (overcurrent)
- RareModule software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.