P0918 Gear Shift Position Circuit Intermittent

P0918 indicates an intermittent gear shift position circuit fault. The gear position signal drops out or becomes invalid only sometimes.

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 clear intermittent position codes without reproducing the signal loss under realistic conditions.

Useful checks before replacing parts

Graph gear position data during gear selection, road vibration, hot operation, and harness movement around the actuator or shifter.
Inspect terminal tension, connector locking, wire flex points, sensor mounting, shared reference stability, and fluid or water intrusion.
Check whether the intermittent fault coincides with missed shifts, wrong gear indication, shift aborts, or adaptation failures.

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.