D4 light Gives code 14

My car is stuck in I don't know what gear but it won't shift up. The D4 light is off and running fine; then after driving for about 20 minutes the D4 light comes on. I check the connection on the passenger side kick panel and the D4 light gives a code 14. What is a code 14? My brother is going to school at UTI and got some diagrams to check the code but we got nowhwere. Does anybody know what it could be? Thanks.