I know this may not seem urgent to most but I need this truck up and running to get my girls a swing set this weekend we have scheduled to pick up. Got the dreaded service DEF light so ordered MM3 tuner from DRD. It will not turn on when I switch the key to on. Checked all the cables and the obd2 port works bc my Bluetooth scanner lights up. Tried disconnecting and reconnecting cord to obd 2 port. Tried it hooked to a charger and not. Any other suggestions? I highly doubt this is DRDs fault I’m sure it something simple like a bad cable or person installing but someone who has worked in the technology and auto field for years I’m out of ideas to try. TIA
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