P049DEGR A Control Position Exceeded Learning Limit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- 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. P049D checks the learned zero point – the fully closed position – of EGR valve A. The module learns the position sensor voltage with the valve closed, at GM during the after-run following ignition off; if the learned value lies outside a window (GM 2018: 83.5–93.5 % of 5 V, GM 2016: 16.4–25.1 %) or the values scatter too much (GM Duramax LML above 30 %), the code sets – MIL after two trips at GM, immediately after learning at Ford. Usually soot at the seat keeps the valve from closing, or a new valve was not taught in.
- What you may notice
- Check engine light on
- Usually no driveability effect
- EGR possibly switched off, rough idle if the valve stays open
- Likely causes
- LikelySoot or deposits at the valve seat, valve does not close fully
- PossiblePosition sensor A faulty or characteristic shifted
- PossibleNew or cleaned valve not taught in, or wrong part
- RarePosition sensor circuit fault as the primary cause
- 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: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.