2020 2500hd 6.6 originally had the melted harness and melted heater so I replaced the tank which comes with a harness. Had service DEF system and derate again. Dropped tank and found DEF tank harness had pin 12 incorrectly switched with wire. Ordered correct harness for new tank and now have new codes P208A for reductant pump control and P20B9 for heater control 1 back again. Ordered reductant pump module thinking I fried it from getting the wrong harness with the tank previously. Programmed module. Still have P20B9 and P208A and DEF system warning. Has anyone gone through this. Pretty lost at this point. I am going to have to go through the diagnostics all over again. Is there a certain reductant pump or heater fuse? Appreciate any help ahead of time. Thank you-Tony.
PowerstrokeTony
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