Here is a real common issue on the Focus! So I finally had one of these come in to the shop and decided to make a video on just how simple it is to change this solenoid. The Focus 4f27e is a very easy to work on trans. More times than no the pcm will throw the p0750 code for a failure in the SSA circuit. After checking the internal wiring harness, ohm out the solenoid terminal to case of solenoid it should be between 10.9 and 26.2 ohms if it fails replace it. Even if it doesn't fail it is likely an intermittent concern as I have seen quite a few of them pass still on the bench. Hope this helps!