Powertrain, generic (extended)

P27CB Pressure Control Solenoid R Electrical

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

An electrical fault of unspecified kind on solenoid R is what P27CB stands for. There is no public manufacturer description of this exact code. GM (shift solenoid 4 in the Corvette DCT table 23OBDG07) and Ford (SPV4 of the TR9070, 2024 overview) both use solenoid R, yet they break its wiring faults down into P27CD, P27CF and P27D0 rather than one lumped code. CARB 13 CCR 1968.2 obliges the module to detect circuit faults on such actuators. In practice the same checks apply as for the detailed codes: winding resistance against specification, pin fit inside the gearbox connector, insulation of the harness and, last of all, the output stage of the TCM.

Likely causes

Solenoid R winding resistance out of specification
Poor pin fit in the gearbox connector
Damaged harness insulation
TCM output stage fault

Symptoms

  • MIL on
  • Gear selection limited
  • Emergency mode possible

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 rtcmwiring harness

Related codes

P27CCP27CDP27CFP27D0P27C3

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