Have you had the codes retrieved from the power-train control module? This would be the first step after verifying that there is nothing obvious on a visual inspection. Here are a couple of guides that might help. Let us know if you get any codes and we can further assist you.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.