Powertrain, generic · Transmission

P0907 Gate Select Position Circuit A High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Set when the gate select position signal on circuit A of an automated manual gearbox stays above its highest valid value for longer than a calibrated time. Typical causes are a short of the signal line to the sensor supply or to battery voltage, a broken sensor ground, or an internal sensor fault. No manufacturer documents this code publicly. The patents of Aisin AI and Isuzu on select control show that the module derives the active gate directly from this sensor voltage, so a reading above the valid band leaves it blind in the select direction; CARB requires out-of-range checks on such inputs. P0906 is the opposite low fault, P09A5 and P09A9 are the high faults of circuits B and C. For the driver this usually means a warning lamp and a gearbox that no longer changes gear or stays in a fallback gear.

Likely causes

Signal wire shorted to sensor supply or battery voltage
Open sensor ground or corroded ground pin
Internal fault of the gate select sensor
Faulty input stage in the transmission control module

Symptoms

  • Check engine or transmission warning light on
  • Gearbox stays in one gear or in neutral
  • Engine may not start because neutral cannot be confirmed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

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

Parts involved

gate select position sensor awiring harnesstcm

Related codes

P0904P0905P0906P0908P09A5P09A9

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