Powertrain, generic (extended)

P27C6 Pressure Control Solenoid P Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27C6 describes a control circuit for solenoid P that is neither open nor shorted but behaves outside its expected range, for example current that does not track the command. No manufacturer documents this code publicly. GM does run such a plausibility test on synchronizer actuation valve 3 of the Corvette dual-clutch unit (23OBDG07), comparing the estimated current with the target, yet assigns a failure to P27C8, not to P27C6; Ford's TR9070 table has no range code for SPV3 either. CARB 13 CCR 1968.2 expects functional or at least circuit monitoring of automatic transmission solenoids. Suspects are a winding whose resistance changes with temperature, corroded contacts adding resistance, or unstable supply voltage.

Likely causes

Coil resistance drifting with temperature
Corroded contacts adding series resistance
Unstable TCM supply voltage

Symptoms

  • MIL on
  • Inconsistent shift quality on the affected rods

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 pwiring harness

Related codes

P27C5P27C7P27C8P27C3P27CE

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