P2374 code meaning
Turbocharger/Supercharger Inlet Pressure Sensor B Circuit
Powertrain system Generic code P23xx codes Check engine light
What P2374 means
P2374 covers any wiring or sensor-side failure of a second pressure sensor mounted upstream of a compressor. Where the letter B belongs is the manufacturer's choice; on parallel twin-turbo V engines, where each turbocharger serves one cylinder bank, a second inlet sensor for the other compressor is the obvious candidate. No manufacturer documents P2374 publicly – GM's supercharged V8 (P012B–P012D) and Ford's 2023 diesels (P012A) only use A codes. Ford's digital SENT sensor shows how such a general code can arise: it is set when the sensor itself signals an internal error or its data stay beyond a threshold for 5 s, while a lost data link counts separately as a U code. The ECM then substitutes a value, usually close to ambient pressure, and may limit boost on that side.
P2374 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2374
- Check engine light on
- Reduced boost or power
Common causes of P2374
- Most likelyConnector or wire of sensor B open, corroded or shorted
- PossibleSensor B reports an internal error
- Less likelySensor supply voltage missing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbocharger inlet pressure sensor bSensor wiringSensor reference voltage
What each part of P2374 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. |
| 74 | The exact fault in that area. |
What to do next
- Note P2374 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 P2374
What does P2374 mean?
P2374 means "Turbocharger/Supercharger Inlet Pressure Sensor B Circuit". P2374 covers any wiring or sensor-side failure of a second pressure sensor mounted upstream of a compressor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2374?
Drive gently and only to a workshop. With P2374 the car can go into limp mode (reduced power) to protect itself.
Will P2374 fail an emissions test?
Yes, it can. P2374 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 P2374 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2374 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.