fwiw, I chased this issue for a long time. Although it kept throwing the code, it drove fine and I never experienced any real drive- or shift-time symptoms.
Originally, I started with the throttle position sensor. I cleaned the connector and used some silicone dielectric. That actually solved the problem for a long time. When it started popping up again, I eventually replaced the solenoid. Somewhere along the way I had to replace the TPS sensor as well but not because of this code.
Long story short, if the solenoid is new, consider working backwards and check the other inputs like the TPS sensor.