Ok so one of my stock pickers had to be towed back to my shop the other day. The operator indicated that he and another operator were trying to see whos truck had more power by butting up to each other and going full throttle. Well I had a wrench and it indicated a code 57. my book states "this status code is displayed when the voltage input to control card plug PCZ positions 13 and 12 are wrong polarity." Symptom: Forward or reverse contactors open momentarily, close and open again (PMT TRIP). it says possible cause "sensor wires reversed in plug PCZ. I checked all of that and everything was ok. Another cause is stated at "check green and yellow wires in postions 12 and 13 of plug. they are in the right positions. What readings should I have at these locations with my meter?? it states that power wires may be reversed. that's not the case here. so all connections are were they should be.

I even swapped traction cards because I thought that it just wasn't reading the current sensor. but I have the same issue. code 57. Im stumped on this

any advise would be greatly appreciated.