P2393 code meaning
Diesel Intake Air Flow B Control Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2393 means
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.
P2393 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2393
- MIL on
- Filter regeneration not carried out
- Possibly blown fuse or further circuit codes on the same supply
Common causes of P2393
- Most likelyMotor lead pinched against a live wire or terminal
- PossibleBridged pins in the connector (moisture, corrosion)
- PossibleShorted turns in the throttle motor
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Diesel intake throttle valveThrottle valve motorActuator wiring
What each part of P2393 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 93 | The exact fault in that area. |
What to do next
- Note P2393 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2393
What does P2393 mean?
P2393 means "Diesel Intake Air Flow B Control Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2393?
Drive gently and only to a workshop. With P2393 the car can go into limp mode (reduced power) to protect itself.
Will P2393 fail an emissions test?
Yes, it can. P2393 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2393 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2393 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.