What does code P0B3A mean?

Q: What does code P0B3A mean?

Motor Electronics Coolant Pump B Control Circuit High. P0B3A indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the motor electronics coolant pump B. This pump is typically an electric auxiliary pump used to circulate coolant through the motor electronics, turbocharger, or battery pack, and the high voltage suggests an open circuit, a short to voltage, or a failed pump driver inside the module.

DTC codes / P0Bxx · Hybrid propulsion / P0B3A

P0B3AMotor Electronics Coolant Pump B Control Circuit High

P0B3A indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the motor electronics coolant pump B. This pump is typically an electric auxiliary pump used to circulate coolant through the motor electronics, turbocharger, or battery pack, and the high voltage suggests an open circuit, a short to voltage, or a failed pump driver inside the module.

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.