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Code 12 is not really a code
27 is fault injector driver interfacecircuit
24 is TPS
Comunication problems can be cause by a few things The ones I can think of of the top of my head are
1. The wrong ECM in the car
2. The service tech enter the wrong information in his machine
3. power problems or other wireing problems.
4. A bad ECM in your car
5. bad diagnostic plug in the shops machine or your car.
6. even incompetence of the tech is possible
I'm not in a position to make a call on this one it is impossible to do so without me being there.