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DTC codes / P2Dxx · Hybrid propulsion / P2D2A
P2D2A indicates that the hybrid or electric vehicle's control module has detected a mismatch between the two coolant temperature sensor signals (Sensor A and Sensor B) that monitor the electronics cooling circuit. The computer compares these readings and sets the code when the difference exceeds a calibrated threshold for a set time, signaling a correlation fault rather than a simple out-of-range condition.
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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