P3805moderate severityPowertrain
48V Battery Temperature Sensor Circuit Malfunction
on 2020 Subaru Legacy 2.5L H4 · AWD
What this code means
The 48V lithium-ion battery temperature sensor is reporting values outside the expected range.
Symptoms
- 48V system may be limited
- Charging/discharging restricted as precaution
- Inaccurate temperature reading
- Mild hybrid functions intermittent
- 48V battery warning
Common causes
- Temperature sensor failure
- Sensor wiring open or shorted
- Connector corrosion
- Sensor out of calibration
- Thermal paste degradation on sensor
Diagnostic steps
- Read 48V battery temperature PID
- Compare to infrared temperature measurement
- Test sensor resistance vs specification
- Inspect sensor connector
- Check wiring for damage
Repair notes
Replace 48V battery temperature sensor. Ensure proper thermal contact with battery cells.
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