P023D code meaning
Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation
Powertrain system Generic code P02xx codes Check engine light
What P023D means
P023D compares the manifold pressure sensor (after the throttle) with boost sensor A (before the throttle): with the engine stopped both must read the same ambient pressure. Saab's 2.8 V6 checks this once per trip with the ignition on before starting and sets the code at a difference of more than 12 kPa, with the warning light and limp mode limited to 170 Nm. The code does not say which sensor is wrong – barometric pressure as a third value decides. Electrical faults of either sensor (P0107/P0108, P0237/P0238) block the test and must be fixed first. GM and Ford run the same comparison but report it as P0236, P0106 or P2227.
P023D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.5 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P023D
- Check engine light on
- Limp mode, limited power
- Otherwise often unremarkable
Common causes of P023D
- Most likelyManifold or boost sensor drifting or dirty
- PossibleContact resistance at connector or ground of one sensor
- PossiblePressure port or hose of one sensor blocked (oil sludge, ice)
- Less likelyEngine module or reference voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Manifold absolute pressure sensorBoost pressure sensor aSensor wiring
What each part of P023D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2 | Area: fuel and air metering (injector circuit). |
| 3D | The exact fault in that area. |
What to do next
- Note P023D 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 P023D
What does P023D mean?
P023D means "Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation". P023D compares the manifold pressure sensor (after the throttle) with boost sensor A (before the throttle): with the engine stopped both must read the same ambient pressure. It is a generic code, so it means the same on every make.
Is it safe to drive with P023D?
Drive gently and only to a workshop. With P023D the car can go into limp mode (reduced power) to protect itself.
Will P023D fail an emissions test?
Yes, it can. P023D 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 P023D to fix?
Difficulty: easy. A typical repair takes 0.5 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P023D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.