DTC codes / P2Bxx · Hybrid propulsion / P2B66
P2B66 indicates that the powertrain control module has detected an open circuit or loss of continuity on the control circuit for coolant pump D, which is an auxiliary electric pump used for charge air cooling or battery thermal management. The computer monitors the commanded state of the pump and the expected feedback on the control wire, and it sets this code when the circuit does not respond as expected.
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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