P2393Diesel Intake Air Flow B Control Circuit High
- 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
- P2393 is the counterpart of P2392: one of the B-throttle motor leads has contact with battery voltage, for example through a pinched harness or a bridged pin in the connector, so the output stage sees an overcurrent as soon as it switches. No manufacturer publishes P2393. For the A valve GM's 2017 diesels flag the analogous P02E3 when more than 9 A flows through the H-bridge in 160 of 200 checks and store it on the second trip. Ford's 2023 diesels need just 0.2 s to recognise the A-valve short. The ECM then disables the driver to protect itself. If P239B is stored as well, a shorted motor winding is a likelier culprit than the harness. Apart from the MIL the driver usually notices nothing; emissions and regeneration suffer.
- What you may notice
- MIL on
- Filter regeneration not carried out
- Possibly blown fuse or further circuit codes on the same supply
- Likely causes
- LikelyMotor lead pinched against a live wire or terminal
- PossibleBridged pins in the connector (moisture, corrosion)
- PossibleShorted turns in the throttle motor
- RareFaulty output stage in the engine control module
- 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: €40 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.