DTC codes / P27xx · Transmission / P2743
P2743 indicates that the transmission control module has detected an abnormally high voltage on the signal circuit of transmission fluid temperature sensor 'B', which usually means the circuit is open or shorted to voltage. The sensor itself may be faulty, but wiring and connector problems are equally common causes of this code.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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