P049EEGR B 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. Circuit B is the second EGR path; on diesels with two circuits it is the low-pressure EGR, which takes exhaust after the particulate filter and feeds it in before the turbo compressor (GM diesels 2016–18, FCA's 2.2 and 3.0 diesels). P049E is the counterpart of P049D for valve B: the learned zero point of its position sensor lies outside the permitted window. GM lists it only in a fault group of its low-pressure EGR (whose position sensor is sensor C there, P044C/P044D), and in the 2016 calibration it is explicitly disabled; thresholds are not published. The description therefore follows GM's P049D strategy by analogy. Low-pressure EGR position control is then switched off.
- What you may notice
- Check engine light on
- EGR switched off, usually no noticeable change
- Higher NOx
- Likely causes
- LikelyLow-pressure EGR valve sooted, does not close fully
- PossiblePosition sensor of the low-pressure valve faulty or shifted
- PossibleValve replaced without teaching in
- RareHarness or connector of the low-pressure valve
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.