OBD-II code · Powertrain (generic, extended)
P2391 Diesel Intake Air Flow B Control Performance
Same as P2390 with the actuator electrically intact yet not delivering the commanded position - sticky valve, broken linkage, or position offset.
Is it safe to drive with P2391?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve stuck due to soot
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Diesel Intake Air Flow B
Related codes
- P02E1Diesel Intake Air Flow A Control Performance
- P238EWater in Fuel Sensor B Circuit Intermittent
- P238FWater in Fuel Condition Sensor B
- P2390Diesel Intake Air Flow B Control Circuit Open
- P2392Diesel Intake Air Flow B Control Circuit Low
- P2393Diesel Intake Air Flow B Control Circuit High
- P2394Diesel Intake Air Flow B Control Stuck Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.