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DTC codes / P0Cxx · Hybrid propulsion / P0C34
P0C34 indicates that the hybrid or electric vehicle battery pack's temperature sensor circuit, specifically the one designated as sensor F, is reporting a voltage or signal that falls outside the expected range for the current operating conditions. The battery energy control module monitors this sensor to protect the high-voltage battery from overheating or overcooling, and it sets this code when the signal is erratic, stuck, or out of specification for a calibrated period.
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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