What P0768 usually means
P0768 is the explicit electrical version of the D-side shift-solenoid fault. It fits the cases where a scanner already says electrical and the transmission suddenly drops into a harsh or limited shift strategy. The diagnosis order should slow down here: prove the circuit, connector, internal harness, and solenoid coil before blaming the valve body or the whole transmission. In practice it completes the same failure pattern seen across the other shift-solenoid families: once the controller cannot trust the circuit, it protects the transmission with backup behavior.