DTC codes / P2Dxx · Hybrid propulsion / P2D56
P2D56 indicates that the hybrid or electric vehicle battery pack coolant temperature sensor C circuit is reporting an intermittent or erratic signal to the vehicle's control module. The computer has detected that the sensor's voltage or resistance readings are jumping unpredictably or dropping out, rather than producing a stable temperature value.
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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