P0912 Gate Select Actuator Circuit Low

P0912 indicates the gate select actuator circuit is low. The actuator control path is grounded, missing voltage, or drawing less current than expected.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Transmission
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the gear mechanism until the low actuator circuit is tested under load.

Useful checks before replacing parts

Measure actuator command voltage, feed, ground, resistance, and current while checking for short-to-ground and voltage-drop faults.
Inspect connector pins, relay or fuse supply, module driver output, harness routing, and actuator winding condition.
Compare the low circuit event with gate position feedback, failed shift attempts, and freeze-frame temperature or voltage data.

Related OBD-II codes

These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.