How do you test shift solenoid a in a 4l80e?

To test the shift solenoid A in a 4L80E transmission, first, ensure the vehicle is safely secured and the Transmission Fluid is at the proper level. Disconnect the electrical connector from the solenoid and use a multimeter to check the resistance; it should typically read between 11-14 ohms. If the resistance is outside this range, the solenoid may be faulty and should be replaced. Additionally, you can apply battery voltage directly to the solenoid to see if it activates and clicks, confirming its operational status.