Powertrain, generic (extended)

P27D0 Pressure Control Solenoid R Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27D0 is the high-side counterpart of P27CF for solenoid R: the control line reads too high, most often because it touches battery voltage or another output. GM applies the same driver diagnostics to synchronizer actuation valve 4 of the Corvette dual-clutch box as to the other valves (23OBDG07, 24OBDG07): a sense voltage stuck above 0.7-1.1 V while switched on, a large gap between target and estimated current, or a cross-short to a neighbouring line found during the switch-off routine and reported on the next start, each Type A. Ford's TR9070 overview lists shorted load of SPV4 under this code. A coil with too few ohms can also cause it, so measure resistance before replacing the harness.

Likely causes

Control line touching battery voltage
Cross-short to a neighbouring solenoid line
Solenoid R coil resistance too low
Defective TCM driver

Symptoms

  • MIL on, sometimes only after restart
  • Gears on rods 3/4 not available
  • Limp mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time1–4 h

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

Parts involved

pressure control solenoid rwiring harness

Related codes

P27CFP27CDP27CEP27CBP27C8P27C0

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.