Powertrain, generic (extended)

P27CD Pressure Control Solenoid R Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27CD is set when the control circuit of solenoid R appears open, so the module cannot energize the valve. On GM's Corvette with dual-clutch transmission (23OBDG07, again in 24OBDG07) the part is synchronizer actuation valve 4. The test runs with the output switched off: without a coil in the circuit, nothing pulls the sense voltage up to battery level, and it remains between roughly 1.7 and 3.0 V; held for 150 ms, this stores the code as Type A. Ford's TR9070 overview uses P27CD for open load of SPV4. Since valve 4 moves rods 3 and 4 in the B-to-A direction, those shifts become impossible. Causes are mainly a pushed-out terminal, a cut lead or a burnt winding.

Likely causes

Terminal pushed out of the connector housing
Burnt-out winding of solenoid R
Cut or broken control lead

Symptoms

  • MIL on
  • Shifts on rods 3 and 4 in B-to-A direction not possible
  • 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

P27CBP27CEP27CFP27D0P27C5P27BD

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