P241F: EGR Cooler B Efficiency Below Threshold
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P241F mean?
The temperature drop across EGR cooler B is below the calibrated threshold - cooler is fouled with soot, has internal scaling, or coolant flow is restricted. Recirculated gas reaches the intake hotter than designed, increasing NOx and combustion temperatures.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Common causes
- High Cooler fouled with soot or scaled
Likelihood is a general estimate across vehicles; your make and model may differ.
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