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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (PHEV) - Diagnostic Codes (4 Of 4) & Circuit Tests >> HYBRID BATTERY SYSTEM (for PHEV Model) >> DTC P1B4B-73: Hybrid/EV Battery Heater Relay Actuator Stuck Closed [03/2023 - ] >> Monitor Strategy

Monitor Strategy

Related DTCs P1B4E (INF P1B4B-73): Hybrid/EV Battery Heater Relay Control Circuit Stuck On
Required sensors/components HV battery heater temperature sensor relay
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None