DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0516
P0516 means the powertrain control module (PCM) has detected a voltage signal from the battery temperature sensor that is lower than the expected range for the current conditions. The sensor is a thermistor that changes resistance with temperature, and a low signal typically indicates a short to ground or an open circuit in the sensor or its wiring.
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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