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You mention three codes coming up, but you only list two of those (of which only U1016 is valid - there is no U1060 listed for your Rendevouz; closest ones would be U1040 or U1064); what's the third code number?
Thank you for that information.
I don't have anything on b 20th or P1689, but the rest of the codes seem to indicate the Electronic Brake Control Module (EBCM) has dropped off the serial data communications network and that is causing issues with the brakes, traction control and transmission systems. A Tech-II or equivalent scan tool would be needed to pinpoint the fault and reprogram the module if replacement of same is necessary - which basically means the vehicle would have to be taken to a qualified repair shop.