Powertrain, generic (extended)

P27F5 Gear Shift Lock Solenoid/Actuator A Stuck Off

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With P27F5 the control unit concludes that shift lock actuator A remains in its passive state although it was told to act. Depending on the design, that can leave the lever free to leave Park without the brake, which defeats the brake interlock, or permanently blocked. No maker publishes this code. FCA recall 16V-249 describes a badly crimped harness terminal on the interlock solenoid of 2016 Jeep Grand Cherokee that cut solenoid function. Ford reports a shift lock actuator that misses its target position as P0929 and fixes it with a new module or software (SSM 51057). Typical culprits are a loose terminal, a weak coil or a broken return spring. P27F4 covers the actuator stuck in its active state; wiring faults are P0928 to P0931.

Likely causes

Loose or badly crimped terminal at the lock solenoid
Weak solenoid coil that no longer moves the lock pin
Broken return spring or worn lock pin
Shifter module software misjudging the actuator position

Symptoms

  • Selector leaves Park without the brake pedal being pressed
  • Lever stays blocked in Park or Neutral
  • Shift system warning message

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–2.5 h

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

Parts involved

shift lock solenoid ashift lock actuator atcm

Related codes

P27F4P0929P0928P0931

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.