I have a 2005 Chevrolet Impala (Base trim, 3.4L) and I recently purchased a cheap OBD2 Bluetooth reader. Unfortunately, Torque (Android app) isn't able to read data from this transmitter when connected to my Impala. I tried it on my 2006 Ford Freestlye and it works very well.
The transmitter lights up and looks like it is functioning properly, but I'm not able to read with the Torque app. I tried another app and it gave a message saying "Cannot query engine rpm."
I'd really appreciate anyone who can tell me some troubleshooting steps. Perhaps GM has a different sub-protocol or something that I don't know about. I'm happy to add information if I left something out. Thanks!