P0751 Shift Solenoid A Performance or Stuck Off

P0751 indicates shift solenoid A performance or stuck-off behavior. The solenoid command did not produce the expected hydraulic or ratio 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 assume the solenoid is electrically failed; performance or stuck-off faults can come from fluid, valve-body, or hydraulic issues.

Symptoms of P0751

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 P0751

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 commanded shift solenoid A state with actual gear ratio, input speed, output speed, and shift timing.
Check fluid level, fluid contamination, valve-body sticking, solenoid operation, wiring, and pressure-control data.
Review whether the condition happens cold, hot, under load, or only during one shift event.

Related OBD-II codes

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