Powertrain, generic · Transmission

P0909 Gate Select Control Error

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Set when the control module of an automated manual gearbox commands the select actuator to a new gate, but the measured select position does not reach the target within the allowed time and tolerance. Sensor and actuator circuits may be electrically fine; the fault lies in the closed loop as a whole. Typical reasons are a jammed or stiff select shaft or shift head, a worn or weak select motor, or a sensor offset. No manufacturer documents this code publicly. An Aisin AI patent describes select control with target and actual gates, and a Hyundai/Kia patent detects jammed or stuck shift actuators from motor current. CARB requires functional checks on such outputs. P0910 to P0913 are the actuator circuit faults, P0919 the same error in the shift direction. The gearbox may refuse gears or stay in neutral.

Likely causes

Stiff or jammed select shaft, shift head or internal selector mechanism
Worn select motor (brushes, gears) with too little force
Select sensor offset or gate positions not relearned
Weak battery or voltage drop on the actuator supply

Symptoms

  • Check engine or transmission warning light on
  • Certain gears cannot be engaged or gearbox stays in neutral
  • Clicking or whirring from the actuator without a gear change

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,000
Time1–6 h

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

Parts involved

gate select actuatorgate select position sensortcm

Related codes

P0905P0910P0911P0919

References: law.cornell.edu, patents.google.com, patents.google.com.