Powertrain, generic (extended)

P27D8 Pressure Control Solenoid S Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27D8 says the control line of solenoid S sits too high. GM bundles three checks for valve 5 of the Corvette dual-clutch box under it (23OBDG07, 24OBDG07), all Type A. First, with the output on, a sense voltage above 700, 900 or 1,100 mV, depending on whether supply is below 11.5 V, between 12 and 15 V or above 15.5 V, means a short to battery. Second, coil current that misses its target by more than 70 % for 60 ms or by 400 mA for 300 ms. Third, a short to a neighbouring output found while every output is cycled at shutdown; it is stored in memory and set on the next start. Ford's TR9070 has no valve S. An energized valve 5 then fails to move rod 5, so its gears stay out of reach.

Likely causes

Control wire touching a supply line
Short to the wire of another valve output
Solenoid S coil with shorted turns

Symptoms

  • MIL on, possibly only after the next start
  • Rod 5 gears out of reach
  • 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 swiring harness

Related codes

P27D7P27D5P27D6P27D1P27D0

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