P0749 Pressure Control Solenoid A Intermittent

P0749 indicates an intermittent pressure control solenoid A fault. The pressure-control circuit or response drops out only under some conditions.

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 clear intermittent pressure-control codes without a heat and vibration check.

Symptoms of P0749

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 P0749

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

Monitor solenoid A command, pressure data, shift timing, slip, and circuit behavior while repeating freeze-frame conditions.
Inspect connector tension, internal harness movement, fluid intrusion, heat sensitivity, and case connector condition.
Check whether the intermittent fault appears with vibration, hot fluid, heavy load, or after long cruise.

Related OBD-II codes

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