Check Engine and traction control light staying on with hard shifting.

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I had the starter replaced in August 2016. Shortly after that I noticed a serious antifreeze leak that was caused by a bad radiator cap spring which was also replaced. Shortly after that, different instrument panel lights were coming on. Firs it was the check oil light, next was the service airbag light, then it was the battery light, and now the only lights that come on and stay on is the check engine and traction control light. When they are both on, the car shifts extremely hard. Sometimes I can start the car and it doesn't come on and drives normally. Other times, it decides to come on and stay on. The check oil light comes on and stays on for a little while and the goes off and does this multiple times while driving. What would cause the check engine and traction control light to stay on and cause hard shifting?