P0780 Shift Malfunction

P0780 indicates a general shift malfunction. The transmission controller detected shift behavior that does not match the expected timing or ratio change.

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 treat P0780 as a complete diagnosis; it is a broad shift fault that requires enhanced transmission data and companion codes.

Useful checks before replacing parts

Review commanded gear, actual gear, input speed, output speed, shift timing, pressure data, and all companion transmission codes.
Check fluid level and condition where serviceable, plus range sensor, speed sensors, solenoid commands, and pressure-control behavior.
Identify whether the malfunction happens on one shift, multiple shifts, cold, hot, or under specific throttle load.

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.