P2D23 code meaning
Turbocharger Interstage Pressure Sensor A Circuit Low
Powertrain system Generic code P2Dxx codes Check engine light
What P2D23 means
P2D23 says the interstage pressure signal sits below the lowest voltage a working sensor can produce. Typical causes are a signal wire shorted to ground, a lost 5 V supply or an internal sensor short. No public table gives a threshold for this sensor; for comparison, Ford's 2023 diesels treat a DEF pressure sensor below 0.2 V as circuit low. The sensor itself sits between the two compressors of a series turbo system, as GM's two-stage control patent describes, where its value guides the low-pressure stage. California requires out-of-range checks on every such input. With the value missing, the controller usually falls back to a model and caps boost. A high reading is P2D24.
P2D23 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D23
- Check engine light
- Boost limited, noticeably less power
- Further codes if the shared sensor supply is affected
Common causes of P2D23
- Most likelySignal wire shorted to ground
- Possible5 V reference open or pulled down by another sensor
- PossibleSensor shorted internally
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbo interstage pressure sensor aWiring harnessECM
What each part of P2D23 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 23 | The exact fault in that area. |
What to do next
- Note P2D23 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 P2D23
What does P2D23 mean?
P2D23 means "Turbocharger Interstage Pressure Sensor A Circuit Low". P2D23 says the interstage pressure signal sits below the lowest voltage a working sensor can produce. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D23?
Drive gently and only to a workshop. With P2D23 the car can go into limp mode (reduced power) to protect itself.
Will P2D23 fail an emissions test?
Yes, it can. P2D23 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 P2D23 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2D23 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.