Hey Mark,

Thanks for the response. All of the above testing was done disconnected from the vehicle. Also the red light on the AVT flashes.

After your message, I went and tried to connect to my 2002 GMC Duramax and my 2000 Camaro and I get the same thing. It alternates between da connect and data error! and the number of errors just keeps counting up. I tried to capture a log of this, but it appears that the log file is blank.

Additionally, I can connect to the Duramax with the cable and LS1 Flash (from pcmhacking), but for some reason it won't download the bin. I can see data flowing with the terminal that AVT includes with the cable. A small cap of the LS1 Flash log is attached below (if it helps at all).

Init:
TX: F1 A5
RX: 91 27
AVT device reset ok
Model: 852
Firmware: 1.6
Identify:
TX: F1 A5
RX: 91 27
AVT device reset ok
AVT VPW mode ok
Set AVT filter
Received OSID: 15094441
Received Calibration ID: 15094440
Received PCM Serial No: 1247MC112H
Received VIN: 1GTHK29192E125xxx
Received BCC: DPJK
Received MEC: 0
Beginning read process
Disable message transmission denied
RX: bad packet status: 60
Failed to get seed, instead:
Beginning read process
Disable message transmission denied
RX: bad packet status: 60
Failed to get seed, instead:
Beginning read process
Disable message transmission denied
Received Seed: 7BE5
Calculated Key: 389E
PCM Unlocked Successfully
Requesting upload
Didnt get VPW OPERATIONS, abort.
Request denied (06 00 )
Beginning read process
Disable message transmission denied
Received Seed: 7BE5
Calculated Key: 389E
PCM Unlocked Successfully
Requesting upload
Didnt get VPW OPERATIONS, abort.
Request denied (06 00 )

Thanks for any thoughts