Fault 57 is a common result of a blown traction fuse. I teach all my tech's, if you must test a fuse in a truck, pay attention to the hundredths digit on your DVM. That will be the tell-tale sign. A good fuse will test the same on both sides, a blown fuse will have several hundredths difference. But it's always a good idea to remove any fuse to test it.
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