P2395Diesel Intake Air Flow B Control Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2395 reports a B intake throttle that remains nearer to its closed stop than the module asks for. Of the two stuck faults this is the more serious one, because a flap jammed near its seat starves the engine of air. No manufacturer publishes thresholds for P2395. The GM 2017 diesel check for valve A (P02E5) mirrors the stuck-open test: a positive error above 16 % while the motor is driven at more than 34 % duty towards opening, 1,280 of 1,600 samples, MIL in the first trip. Deposits that lock the flap close to its stop, an iced shaft after cold and damp nights, or a broken return spring are the usual reasons. The engine may smoke, lose power markedly, drop into limp mode or even stall; low-air-flow codes such as P239D often follow.
- What you may notice
- Marked loss of power, limp mode
- Black smoke under load
- Rough running or stalling in severe cases
- Likely causes
- LikelyDeposits locking the flap near its closed stop
- PossibleBroken return spring, flap no longer opens when unpowered
- PossibleJammed gear train or seized shaft bearing
- RareIce on the shaft or flap after cold, damp conditions
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.