If you get a reading of all 255s or “cannot read CV” from a loco it is either because the decoder is not functioning or you have a communication issue between the system and the loco. If it is a sound loco, and you have a 5amp ph-pro system you might need a booster for the programming track.
Read this: https://ncedcc.zendesk.com/hc/en-us/articles/202353705-Cannot-Read-CV
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