make a loud thump noise, stay in second gear, and the check engine light come on

Good morning c4344, Intermittent vehicle problems can be tricky to deal with and will require the vehicle to exhibit whatever the reported symptoms are, so that we can trace down the source of the issue. With that said, we have been in business for nearly 20 years and specialize in these very situations. I would suggest considering possibly leaving the vehicle with us for a few days, if necessary, should the vehicle need to be driven in order to duplicate your complaint. Please feel free to reach out to us at Interstate Auto Care- (248)307-1200