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followed manual for code 1518 came up with replace tac, brand new out of gm box tac module still have code coming up. Now i have code p0200 coming up too. Both seem to be related to short to B+ hot, but tac is not hot when ign is off . Also new throttle body, throttle pedel.?????????????????
Here's the complete GM designation for your code problem:
DTC P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit
DTC P0200 Injector Control Circuit
....something isn't exactly right with your new throttle body ( & pedal?) install....recheck install instructions or contact throttle body/pedal manufacturer's Tech Service Dept. for help...