P0999: Confirm the F-channel high-circuit identifier before applying a test

P0999 is listed as shift solenoid F's short-to-power result in Ford's general table, paired with P2706_12. The architecture table instead puts P2710 in that cell, while other pages use a different suffix for P2710. This is a real mapping limitation, not a reason to guess a universal alias.

Separate the electrical category from the code display

For the general P0999 branch, the documented evidence is a power-short electrical classification. Ford describes continuous smart-driver monitoring and a typical 1.5-second persistence criterion. That differs from F's functionally failed-on result P2708/_7E, which uses response-event monitoring.

A circuit-high result is not itself a universal connector-voltage specification. Command state and the applicable circuit design remain necessary to interpret an external measurement.

Resolve the reporting scheme first

Preserve the full controller code, failure suffix and transmission identity. If a scanner translates the result, retain the original representation where available so the service definition can determine which electrical branch actually applies.

A current normal F response cannot locate an earlier power-path event, and a functional problem does not independently identify the electrical cause. The source does not supply a universal F-solenoid location or replacement. The documented code-mapping difference remains flagged until matched service information resolves it for the vehicle.

Source and applicability

Ford 2024–2025 gasoline OBD operation summary, July 16 2024 revision; only the cited monitor and transmission architectures. No individual vehicle fitment or universal calibration is inferred. Ford PDF, page 151. Ford PDF, page 152. Ford PDF, page 155. Ford PDF, page 160.