P3202high severityPowertrain
Hybrid/EV Battery Pack State of Charge Calculation Error
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The BMS is unable to accurately determine the state of charge of the HV battery. The SOC calculation has drifted beyond acceptable accuracy.
Symptoms
- Battery gauge inaccurate
- Unexpected power loss
- Vehicle may stop unexpectedly
- Range estimation wildly incorrect
- Regenerative braking inconsistent
- Frequent recalibration requests
Common causes
- BMS current sensor failure
- Cell voltage sensor drift
- Software calibration lost
- Battery not fully cycled recently
- Temperature sensor error affecting calculation
Diagnostic steps
- Read raw cell voltages and compare to reported SOC
- Check current sensor calibration
- Perform BMS-commanded full charge/discharge cycle
- Test temperature sensors in battery pack
- Review BMS software version and updates
Repair notes
Recalibrate BMS through full charge/discharge cycle. Replace current sensor if faulty. BMS software update may be available.
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