I have a MS906TS and I keep getting a "Device limits exceeded" when I try to run a DEF fluid quality test on my 2012 Silverado 3500HD. I have a Service emissions system speed limited message but no DTC's. All sensors are within nml range and all the prerequisites for running the test are met. I was able to start the test yesterday but for some reason it was interrupted. So I tried agin to day and keep getting  "Device Limits exceeded". I've rebooted the table several times and cycled the ignition several times. All modules tests pass with no faults. I have plenty of free storage on the device. I also emailed Autel Tech support and am waiting for a response. Thanks