At stop sign will quit for no reason put it in park tostart. trany kicks in/out2

Hello, This is a failure of the engine control module (ECM), ECM circuit, or grounding for the ECM. P2105 is limp mode and forced shut-down. The ECM should be tested to ensure proper operation, as well the circuit for the ECM. A professional technician with computerized scanning equipment will be needed for an accurate and proven diagnosis.