P0929 Gear Shift Lock Solenoid Control Circuit Range/Performance

P0929 points to gear shift lock solenoid control range/performance. The solenoid circuit may operate, but release behavior or feedback is not as 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 shifter assembly until solenoid command, brake input, and mechanical release movement are compared.

Useful checks before replacing parts

Compare shift-lock command with actual solenoid movement, brake switch status, park position data, battery voltage, and shifter release timing.
Inspect solenoid binding, shifter mechanism drag, spilled-liquid residue, connector voltage drop, and brake switch correlation.
Check whether the issue occurs only cold, after parking, with low voltage, or after console or shifter service.

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.