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DTC codes / P2Bxx · Hybrid propulsion / P2B66

P2B66Coolant Pump D Control Circuit/Open

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.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage