Powertrain
Definition only
Lights the check engine lamp
P2391: Diesel Intake Air Flow B Control Performance
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P2391 mean?
Same as P2390 with the actuator electrically intact yet not delivering the commanded position - sticky valve, broken linkage, or position offset.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Valve stuck due to soot
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2391 on the same make and model first.
P2391 in the community
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