P049BEGR B Flow Insufficient Detected
- 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). P049B means too little flow in circuit B: with the low-pressure valve open the module expects a change in fresh air mass or manifold pressure, or a modelled EGR volume, and the actual flow stays below the threshold. FCA documents it on the 3.0-litre EcoDiesel third generation in the 2020 Ram 1500, partly as a false trigger fixed by a software update; thresholds are not published.
- What you may notice
- Check engine light on
- Sluggish acceleration (FCA bulletin)
- Higher NOx
- Likely causes
- LikelySoftware or calibration (false trigger)
- LikelyLow-pressure EGR valve sooted or stuck closed
- PossibleLow-pressure EGR cooler or line blocked
- RareImplausible sensors (air mass, pressure difference)
- 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: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.