P2D21: Turbo pressure sensor A between the two stages has an electrical fault
Turbo pressure sensor A between the two stages has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P2D21 |
|---|---|
| System | Engine and transmission |
| Group | P2Dxx, Engine, emissions and electrification |
| Type | Generic: it means the same on every make |
How to read and clear P2D21 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2D21 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2D02 The engine electronics water pump A is turning slower than it should
- P2D07 The engine electronics water pump B is turning slower than it should
- P2D0C The engine electronics water pump C is turning slower than it should
- P2D22 The turbo pressure sensor A between the stages gives readings that do not match
- P2D3B The system that discharges the high voltage when switching off is not working
- P2D50 A module of the high-voltage battery is overheating
- P2D51 The drive line of the air-assisted injector has an electrical fault
What does code P2D21 mean?
Turbo pressure sensor A between the two stages has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P2D21?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2D21 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
