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Home >> Toyota >> 2025 >> Prius LE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (HEV) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests >> HYBRID BATTERY SYSTEM (for M20A-FXS) >> DTC P3000-4B: Hybrid/EV Battery Control System Over Temperature [12/2022 - ] >> Description

DTC P3000-4B: Hybrid/EV Battery Control System Over Temperature [12/2022 - ]: Description

The battery ECU assembly monitors the temperature of the HV battery to detect if it becomes excessively high.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P3000-4B Hybrid/EV Battery Control System Over Temperature The battery ECU assembly detects a HV battery cooling system error signal.
(1 trip detection logic)
  • Hybrid vehicle control ECU
  • HV battery
Does not come on Master Warning:
Comes on
HV Battery A SAE Code: P3000

HINT: 

The normal HV battery temperature is 60°C (140°F) or less.