P241FEGR Cooler B Efficiency Below Threshold
- 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
- Engines with two EGR loops can carry two coolers; P241F flags that the second one, cooler B, no longer removes enough heat from the recirculated gas. GM's 2020 diesel tables (20OBDG04) pin cooler B to the low-pressure EGR path: efficiency is derived from the gas temperatures before and after the cooler, corrected for flow, averaged and failed below 50 percent, a Type B fault (two trips) with coolant between 60 and 130 °C. The high-pressure cooler is checked there under P2457 against 72.61 percent. Ford monitors its single cooler only under P2457, via outlet temperature over coolant temperature. CARB demands detection of insufficient EGR cooling. Expect higher NOx and a fouled or bypassing cooler.
- What you may notice
- Check engine light after two trips
- Higher NOx, possibly more frequent DPF regenerations
- Likely causes
- LikelySoot or lacquer deposits on the cooler passages
- PossibleDrifting EGR temperature sensor before or after the cooler
- PossibleWeak coolant flow through the cooler (air pocket, thermostat, pump)
- RareCooler bypass flap not closing
- 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: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.