Powertrain, generic (extended)

P27BE Pressure Control Solenoid N Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27BE means the control circuit of solenoid N is electrically intact but behaves implausibly, for example a measured current that does not follow the command. No manufacturer documents P27BE publicly. GM's Corvette dual-clutch table 23OBDG07 does monitor exactly this for synchronizer valve 2, comparing target current with the current estimated from duty cycle and battery voltage, but files a deviation above 70 % for 60 ms or above 400 mA for 300 ms under P27C0 rather than here. Ford's TR9070 list also has no entry for it. CARB 13 CCR 1968.2 asks for a functional check of automatic transmission solenoids and, where none is feasible, at least circuit fault detection. Likely causes are a coil with drifting resistance, high connection resistance or a weak driver stage.

Likely causes

Solenoid N coil resistance out of specification
High resistance at connector or crimp
Unstable supply voltage to the TCM

Symptoms

  • MIL on
  • Slow or incomplete gear engagement on one shift rod

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 nwiring harness

Related codes

P27BDP27BFP27C0P27BBP27C6

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