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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System - Diagnostic Codes (2 Of 2) & Circuit Tests >> Hybrid Battery System >> DTC P31B4-00: Extreme Hybrid/EV Battery Charging Current [11/2021 - ] >> Description

DTC P31B4-00: Extreme Hybrid/EV Battery Charging Current [11/2021 - ]: Description

The battery ECU assembly monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunction.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
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