P3204high severityPowertrain
HV Battery Cooling System Flow Rate Low
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The HV battery cooling system is not providing adequate coolant flow to maintain optimal battery temperature.
Symptoms
- Battery temperature warning
- Reduced charge/discharge rate
- Power output limited
- Fan running at maximum speed
- Reduced electric range in hot weather
- Charging speed reduced
Common causes
- Coolant pump failure
- Clogged cooling lines
- Low coolant level in battery circuit
- Air in cooling system
- Thermostat stuck closed
Diagnostic steps
- Check battery coolant level
- Monitor battery temperatures across modules
- Test coolant pump operation
- Inspect cooling lines for kinks or blockage
- Bleed air from battery cooling circuit
Repair notes
Replace coolant pump if failed. Flush and refill battery cooling circuit with specified coolant. Repair any leaks.
Other Powertrain codes on this vehicle
P0001
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P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
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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