Pricing a problem

My 2000 Hyundai Sonata GLS has a Solenoid Valve (“D” I believe) error; I am trapped in 3rd gear. I changed the input speed sensor and a bad coil pack prior to getting down to this last error. As I understand it, the error can mean that the valve is either faulty or not plugged in all the way. Can someone give me a ball park estimate on what this type of job should take, being that AAMCO and my friendly Hyundai dealer don’t want to call me back with a rough estimate? I had a good mechanic take care of the other problems before but the solenoid valve was outside of his expertise for hyundai’s.

What is the CEL code that you are getting? Please post it and someone might be able to help you.