P3203critical severityPowertrain
Hybrid/EV Battery Pack Internal Resistance High
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The internal resistance of the HV battery pack has exceeded acceptable limits. High resistance reduces power capability and increases heat generation.
Symptoms
- Reduced acceleration
- Lower electric driving range
- Battery overheating
- Reduced charging speed
- Power limit warning
- Increased energy consumption
Common causes
- Battery age-related degradation
- Frequent fast charging cycles
- Exposure to extreme temperatures
- Cell connection corrosion
- Individual cell resistance increase
Diagnostic steps
- Measure pack internal resistance via BMS data
- Compare to factory specification
- Check individual module resistance values
- Inspect HV bus connections for corrosion
- Review battery usage and charging history
Repair notes
Battery pack or module replacement based on which modules show elevated resistance. No repair for cell-level degradation.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1