Powertrain, generic (extended)

P2790 Gate Select Direction Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2790 is the basic circuit fault for the signal that tells the controller in which direction the selector mechanism is moving across the gate, that is sideways between the shift lanes of the H pattern. In automated manual gearboxes the select actuator or its sensor provides this information; on some shift-by-wire levers it comes from the lever itself, so the exact part depends on the manufacturer. A circuit code means the signal is missing or of the wrong type, for example an open wire or a dead sensor, rather than a value that is merely too low or too high (those are P2791 and P2792). No manufacturer documents P2790 publicly; CARB 13 CCR 1968.2 requires circuit checks for such gearbox inputs. Results range from refused gear changes to a vehicle that stays in one gear or will not pull away.

Likely causes

Open wire or loose, corroded connector at the select sensor
Failed select direction sensor or select actuator electronics
Fault in the shift lever module where it supplies the signal
Defective input stage in the transmission controller

Symptoms

  • Gear changes refused or gearbox stuck in one gear
  • Vehicle may not move off from standstill
  • Warning lamp with transmission message

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

gate select sensorshifter assemblywiring harness

Related codes

P2791P2792P0904P0910

References: law.cornell.edu, en.wikipedia.org.