Anyone know what these codes are ?

 

Code 51-Injector1[img]i/expressions/face-icon-small-blush.gif[/img]pen load,short curcuit to ground,or short curcuit to battery.Code 52 is same possibilities but for injector 2.Code 56 is pump relay open load,pump relay short curcuit to ground,or pump relay short curcuit to battery.Sounds like you are losing the ground or the power wire is broken or grounding itself out.

 

The codes sometimes mean different things on different models. You need to check the book for your specific model to be sure.