P248F: EGR Cooler Bypass Control Circuit Range or Performance Bank 2
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P248F mean?
Same as P245B on bank 2. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
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 Bypass valve sticking due to soot
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P248F on the same make and model first.
P248F in the community
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