The P0750 code in your 2020 Subaru Forester indicates a malfunction with shift solenoid A. Your Forester uses a Lineartronic CVT, which employs solenoids differently than conventional automatic transmissions. Shift solenoid A controls specific hydraulic functions that affect CVT operation and ratio changes.
Shift Solenoid Function in CVT
While CVTs don't have traditional gears, they use solenoids to control pulley positions and hydraulic pressure routing. Shift solenoid A typically controls specific aspects of this operation. A malfunction affects the CVT's ability to change ratios smoothly or maintain proper belt clamping.
Common Causes
The shift solenoid may have failed electrically (open or shorted coil) or mechanically (stuck). Wiring issues between the TCM and solenoid affect control. Contaminated CVT fluid causes the solenoid to stick. Valve body problems affecting solenoid operation. Connector corrosion at the transmission.
Symptoms in Your Forester
Delayed or harsh ratio changes in the CVT. The transmission may feel like it's hunting or won't hold a ratio. Possible shudder during ratio changes. Reduced fuel economy if the CVT can't optimize ratios. Check engine light with P0750 stored. The CVT may enter a failsafe mode.
Subaru CVT Diagnosis
Using Subaru SSM, check shift solenoid A operation and status. Monitor CVT ratio and pressure data during driving. Test solenoid resistance against specifications. Check CVT fluid level and condition—Subaru CVTs are very sensitive to fluid condition. Verify wiring to the solenoid.