P0797 Pressure Control Solenoid C Stuck On

P0797 indicates pressure control solenoid C is stuck on. The transmission pressure response remains active or too high when it should change.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

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 controller before proving whether the solenoid is mechanically stuck or electrically held on.

Symptoms of P0797

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0797

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare solenoid C command with pressure data, shift feel, slip, input speed, output speed, and freeze-frame conditions.
Check for a stuck valve, contaminated fluid, solenoid mechanical sticking, shorted driver circuit, or wiring that keeps the solenoid energized.
Review whether harsh shifts, bind-up, or pressure-control codes appear only hot, cold, or under heavy load.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.