What does code P2B72 mean?

Q: What does code P2B72 mean?

Coolant Heater A Control Circuit/Open. P2B72 indicates that the powertrain control module (PCM) has detected an open circuit or loss of continuity in the control circuit for Coolant Heater A, which is typically an electric heater element used to warm engine coolant for faster cabin heat and reduced cold-start emissions. The PCM commands the heater on under specific conditions and monitors the circuit for expected voltage or current feedback; when the feedback is missing, the code is stored.

DTC codes / P2Bxx · Hybrid propulsion / P2B72

P2B72Coolant Heater A Control Circuit/Open

P2B72 indicates that the powertrain control module (PCM) has detected an open circuit or loss of continuity in the control circuit for Coolant Heater A, which is typically an electric heater element used to warm engine coolant for faster cabin heat and reduced cold-start emissions. The PCM commands the heater on under specific conditions and monitors the circuit for expected voltage or current feedback; when the feedback is missing, the code is stored.

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.