ASE A6 Electrical Electronics Practice Test

A shift interlock solenoid circuit.

61. The shifter on the automatic transmission above will not shift out of PARK unless the shift interlock solenoid is commanded ON with a scan tool. Technician A says a faulty shift interlock solenoid has caused this condition. Technician B says a faulty brake switch could be the cause. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


A shift interlock solenoid diagram.

Answer A is wrong. If the solenoid only works when commanded ON with the scan tool, inspect and test the system's inputs, like the brake switch/circuit. Check brake light operation to rule out the stoplight fuse and the brake switch as the cause.

Answer B is correct. The shift interlock solenoid/actuator is a member of the shifter assembly in the center console or the steering column. It locks the shifter in PARK until the ignition is ON and the brake pedal has been depressed.

Answer C is correct. Technician B is correct, check the brake switch/circuit.

Answer D is wrong. Technician B is correct.