SyncUP Drive not reading diagnostic codes

I've talked to TMobile several times.  One rep said she found out it's something wrong in their program and TMobile is trying to fix it.  I don't really believe so.  Other reps don't seem to know there's a problem….if there's a problem why wouldn't they let customers know.  
I've done everything to include deleting App and starting over.  It's just the engine health.  I can read battery and gas info, I get notice when my car starts and stops.  Just no engine health.  If you get yours fixed please share .  Thx