DTC codes / P2Bxx · Hybrid propulsion / P2B68
P2B68 means the engine control module has detected an abnormally high voltage on the control circuit for coolant pump D, which is one of several electrically driven pumps used for engine or hybrid system cooling. The circuit is commanded on or off by the module, and a high-voltage reading tells the module that the wire is likely shorted to power, open, or the pump's internal control electronics have failed.
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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