P2721 code meaning
Pressure Control Solenoid D Control Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P2721 means
P2721 is logged when the control line of solenoid D reads too high, typically because it touches battery positive. GM's 2016 six-speed tables describe it as circuit high covering an open or a short to power, set after 0.3 s in one trip, so on those units an open line can land here too. The 2023 Corvette dual-clutch TCM tests with the driver on and sets it when the sense voltage exceeds a limit that rises with supply, about 0.7 V below 11.5 V and 1.1 V above 15.5 V (Type A); Ford's TR9070 calls this shorted load. Subaru bulletin 16-149-25 lists P2721 on 2020-2023 Legacy, Outback and Crosstrek with the TR580 CVT: condensation reaches the control valve connector, and a new control valve and connector cover fix it.
P2721 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2721
- MIL on and fail-safe operation
- Shift shock or missing gears
- Fault may follow wet weather or washing
Common causes of P2721
- Most likelyMoisture in the control valve connector (Subaru TR580)
- PossibleControl wire shorted to a supply circuit
- PossibleOpen circuit on units that report it as high (GM six-speed)
- Less likelyFaulty solenoid D or TCM driver
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid dWiring harness
What each part of P2721 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 21 | The exact fault in that area. |
What to do next
- Note P2721 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 P2721
What does P2721 mean?
P2721 means "Pressure Control Solenoid D Control Circuit High". P2721 is logged when the control line of solenoid D reads too high, typically because it touches battery positive. It is a generic code, so it means the same on every make.
Is it safe to drive with P2721?
Drive gently and only to a workshop. With P2721 the car can go into limp mode (reduced power) to protect itself.
Will P2721 fail an emissions test?
Yes, it can. P2721 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 P2721 to fix?
Difficulty: medium. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P2721 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.