Powertrain, generic (extended)

P2721 Pressure Control Solenoid D Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Moisture in the control valve connector (Subaru TR580)
Control wire shorted to a supply circuit
Open circuit on units that report it as high (GM six-speed)
Faulty solenoid D or TCM driver

Symptoms

  • MIL on and fail-safe operation
  • Shift shock or missing gears
  • Fault may follow wet weather or washing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pressure control solenoid dwiring harness

Related codes

P2716P2718P2719P2720P2730P0963P2763

References: static.nhtsa.gov, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.