P0906 Gate Select Position Circuit Low

P0906 indicates the gate select position circuit is low. The position signal is below expected range or pulled toward ground.

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 perform adaptation relearns until the low position circuit is electrically stable.

Useful checks before replacing parts

Measure gate position signal voltage, reference voltage, ground, and continuity while moving the selector or actuator through travel.
Inspect connector terminal tension, short-to-ground faults, sensor mounting, harness rub points, and shared reference circuit issues.
Compare gate position data with actuator command and gear selection state to confirm when the low signal appears.

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.