P2396Diesel Intake Air Flow B Position Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2396 is the general electrical fault of the sensor that reports the angle of the B intake throttle, a potentiometer or, on newer units, a contactless Hall sensor with analogue or SENT output. The code says only that the signal is electrically implausible, without telling whether the reading sits under or over its window; makers that separate the two would set P2398 or P2399 instead. No manufacturer was found that uses P2396. On the A side the LML 6.6 L Duramax tables from GM accept 0.40 to 4.72 V and Ford's 2023 diesels 0.08 to 4.92 V before they set their split codes. Without a valid position the module cannot run closed-loop control and usually de-energises the flap. Check the 5 V reference, ground and signal wire and the connector before replacing the throttle unit, which normally contains the sensor.
- What you may notice
- MIL on
- Flap switched off, EGR runs with limited control
- Regeneration postponed
- Likely causes
- LikelyCorroded or loose sensor connector
- PossibleDamaged reference, ground or signal wire
- PossibleFailed position sensor in the throttle unit
- 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: €30 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.