Powertrain, generic · Transmission

P0912 Gate Select Actuator Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Set when the drive circuit of the gate select actuator of an automated manual gearbox shows a voltage that is too low for the current switching state, which usually means a short to ground on a motor or control line, or an internal short in the actuator. Many controllers then switch the affected output off to protect the driver stage. No manufacturer documents this code publicly. Isuzu and Hyundai/Kia describe in their patents select and shift actuators built as electric motors and driven by the transmission controller, which is the hardware this circuit check covers; CARB requires circuit monitoring of such outputs. P0913 is the matching high fault, P0910 an open circuit and P0911 a plausibility fault. With the select actuator disabled, the gearbox can no longer change gates.

Likely causes

Actuator wire chafed through and shorted to ground
Internal short in the select motor, e.g. from brush debris
Faulty driver stage in the transmission control module

Symptoms

  • Check engine or transmission warning light on
  • No gate change possible, gearbox stays in current gear or neutral
  • Vehicle may not pull away

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time0.5–4 h

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

Parts involved

gate select actuatorwiring harnesstcm

Related codes

P0909P0910P0911P0913

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