OBD-II code · Powertrain (generic, extended)
P2394 Diesel Intake Air Flow B Control Stuck Open
Diesel intake air flow valve B is mechanically stuck open - the ECU cannot close it for anti-shudder shutdown or EGR mixing assistance.
Is it safe to drive with P2394?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve stuck open due to soot or broken linkage
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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
- P02E4Diesel Intake Air Flow A Control Stuck Open
- P2391Diesel Intake Air Flow B Control Performance
- P2392Diesel Intake Air Flow B Control Circuit Low
- P2393Diesel Intake Air Flow B Control Circuit High
- P2395Diesel Intake Air Flow B Control Stuck Closed
- P2396Diesel Intake Air Flow B Position Sensor Circuit
- P2397Diesel Intake Air Flow B Position Sensor Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.