Thank you Bruce, Your Traffic Monitor show this decoder is not responding with any milAmps max=0mA and is not talking back at any length of time at all. ACK Acknowledge time Pulse = 0uS Please make sure you turned on the Power Button and it is Green and All four LEDs are on. which I'm sure you all ready did. Then check the AC voltage on the Prog track and let me know what it is. IF possible use a 14-18vdc, 2+amp laptop power supply connected to the Motor Shield Try Your Other good Loco decoder on the Programming Track and repeat the commands you used Above again First then see what a Good Traffic Monitor Conversation looks Like What does this bad response from your decoder mean; The First request <R 8 1 1> You asked to Read the Decoders Manufacturer number in CV8 Prog Read Cmd: CV: 8, Callback Num: 1, Callback Sub: 1 JMRI received the request Unrecognized reply: '* ACK baseline=0/0mA Threshold=20/59mA Duration between 2000us and 8500us *' DCC++ setup is set to listen Between 2000 or .2sec and 8500 or .85 sec and wait for a decoder to respond. Unrecognized reply: '* V0 cv=8 bit=7 *' We tried to verify what was in CV1 bit 7 and we received 0 response Unrecognized reply: '* NO-ACK after 143mS max=0/0mA pulse=0uS *' Your Decoder is either dead or there wasn't enough Voltage or Current Amps to have the decoder power up and respond The Decoder never even coughed Unrecognized reply: '* V1 cv=8 bit=7 *' Unrecognized reply: '* NO-ACK after 145mS max=0/0mA pulse=0uS *' Unrecognized reply: '* Callback(-1) *' A positive response would have shown callback valid# 1 to 225 for a Mfr. number The Second Request above was to <R> Read the Address of the Engine and reply to me and the decoder responded the same. It should have recalled your Loco's Number or Address. A Couple of solutions. Try a higher vdc power supply to the Motor shield if you have one, but either way try this; First we're going to give this decoder much more time to respond by spreading the ACK Acknowledgement wait time in DCC++EX to 1000us to 1400us , or from .1 sec to 1.4 sec Use the JMRI Send DCC++ Command panel to send these commands <D ACK MIN 1000> <D ACK MAX 1400> and to lower the milamp to a lower current <D ACK LIMIT 10> Then send <R 8 1 1> request again for the Mfr ID again Your learning the New Powerful DCC++EX Diagnostics commands for Difficult decoders whether their Z, N HO or G Scale rated. We'll be here to help you out.