DTC P1B4B-73: Hybrid/EV Battery Heater Relay Actuator Stuck Closed [03/2023 - ]: Description
The battery ECU assembly controls the driving relay for the HV battery heater.
If the HV battery heater relay does not turn off when the battery ECU assembly stops outputting current, the battery ECU assembly will detect a malfunction and store a DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| P1B4B-73 | Hybrid/EV Battery Heater Relay Actuator Stuck Closed | The temperature of the HV battery increases even though the battery ECU assembly is not outputting current to turn the traction battery heater relay on. (1 trip detection logic) |
|
Comes on | Master Warning: Comes on |
HV Battery | A | SAE Code: P1B4E |