Powertrain, generic (extended)

P27C4 Pressure Control Solenoid P Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27C4 indicates that solenoid P works most of the time but its circuit or response briefly drops out. No manufacturer documents the code publicly; GM's Corvette DCT table 23OBDG07 and Ford's TR9070 list, which both use this solenoid as synchronizer valve 3, only publish hard faults such as P27C5, P27C7, P27C8 and the hydraulic codes P27C1/P27C2. CARB 13 CCR 1968.2 counts transmission solenoids among monitored outputs. Intermittent dropouts usually come from fretting corrosion at terminals, a conductor broken inside its insulation, or a solenoid whose winding opens when it reaches operating temperature. Logging data while flexing the harness and warming the unit helps catch it.

Likely causes

Fretting corrosion on connector terminals
Wire strand broken inside intact-looking insulation
Solenoid winding that opens at operating temperature

Symptoms

  • MIL that comes and goes
  • Occasional harsh or missed shift

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time1–4 h

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

Parts involved

pressure control solenoid pwiring harness

Related codes

P27C3P27C5P27C7P27C8P27CC

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