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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 P31B4-00: Extreme Hybrid/EV Battery Charging Current [03/2023 - ] >> Description

DTC P31B4-00: Extreme Hybrid/EV Battery Charging Current [03/2023 - ]: Description

The battery ECU assembly monitors its internal operation. If it detects the following malfunction, it will store this DTC and perform fail-safe control.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P31B4-00 Extreme Hybrid/EV Battery Charging Current An abnormal signal is detected by the battery ECU assembly (excessive charging current).
(1 trip detection logic)
Hybrid vehicle control ECU Does not come on Master Warning:
Comes on
HV Battery A SAE Code:
P31B4