Hey all, I'm new to the group though I've read posts for some time. My problem is the tranny in my '03 CTS. The last two times I drove it every shift (up & down) was extremely hard, jerking the car. Check engine light came on and the codes are P0700 (transmission control system), P1779 (engine torque delivered to tcm signal) & P1795 (can bus throttle body position). Any insight would be appreciated before I take it to the dealer. Thanks.