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Unfortunately, GM can NOT seem to follow rules, because, per SAE, the OBD-II CAN connection is supposed to be a 'fault-free' connection, meaning whatever someone hangs onto it is NOT supposed to affect the rest of the vehicle.

When you take shortcuts, you get unintended consequences...as GM is finding out. This is *why* the ScanGauge-II has problems on the 2011 Cruzes, ie: it's a non-stand OBD-II CAN operation, and why GM made changes with the 2012 and 2013 vehicles...and did new programming!
 
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