Powertrain, generic (extended)

P27F4 Gear Shift Lock Solenoid/Actuator A Performance/Stuck On

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P27F4 concerns the mechanical result of the shift lock, not its wiring: actuator A was commanded but stays in its active state or does not reach the requested position. Whether active means locked or released depends on the design. No manufacturer documents P27F4 publicly. Ford reports the same kind of fault as P0929 from its shifter module: bulletin 25-2045 for 2021-2024 F-150 lists a shifter that will not leave Park or will not stow, with the wrench lamp rather than the MIL. FCA recall 16V-249 explains the risk of a failed interlock solenoid on 2016 Grand Cherokee: the lever could stay trapped in Park or Neutral. Check for binding in the shifter, then supply and ground of the actuator. P27F5 is the opposite stuck state.

Likely causes

Lock pin or actuator binding in the shifter mechanism
Faulty gear shift module or its software
Implausible brake pedal signal keeping the lock commanded

Symptoms

  • Selector cannot be moved out of Park despite pressing the brake
  • Shift system warning or wrench lamp in the cluster
  • Clicking from the shifter with no release

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

P27F5P0929P0928P0930P0931

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