P3474moderate severityPowertrain
EV/Hybrid Chiller Circuit Performance Low
on 2012 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The refrigerant-to-coolant chiller that provides supplemental cooling for the battery has reduced performance.
Symptoms
- Battery temperature higher than expected in warm weather
- Fast charge speed reduced in heat
- Active cooling insufficient
- Compressor running but battery stays warm
- Range reduced in hot weather
Common causes
- Low refrigerant charge
- Chiller heat exchanger fouled
- Expansion valve malfunction
- Compressor performance degraded
- Coolant flow rate to chiller insufficient
Diagnostic steps
- Check refrigerant charge level
- Monitor chiller inlet and outlet temperatures
- Test expansion valve operation
- Measure coolant flow through chiller
- Check compressor performance
Repair notes
Recharge refrigerant system. Replace chiller, expansion valve, or compressor as needed.
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