there is a service bulletin out on this code
has something to do with a voltage drop at the line contactor

they recommend installing a PTC (current limiter) across the contactor power terminals. If it already has one installed then it may need to be replaced or there is some issue with the contactor itself.

i remember when these trucks first came out and started throwing those codes we had issues with bad contactors, installing new tips did not work, the contactor had to be replaced as a complete unit. We also replaced the PTC at the same time.