P3400critical severityPowertrain
Onboard Charger (OBC) Internal Fault
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The onboard charger has detected an internal fault that prevents AC charging. The OBC converts AC power from the charging inlet to DC for the battery.
Symptoms
- Vehicle will not charge from AC source
- Charging indicator shows fault
- Reduced charging speed
- Charge session terminates unexpectedly
- Error message on dashboard
- Charging light flashing red
Common causes
- OBC power electronics failure
- Internal relay failure
- PFC circuit malfunction
- Output rectifier failure
- Control board fault
Diagnostic steps
- Attempt charge session and read OBC fault codes
- Monitor OBC input and output voltage during charge
- Check OBC coolant temperature
- Inspect OBC connectors
- Test charging with different EVSE equipment
Repair notes
Replace onboard charger assembly. Verify charging operation with Level 1 and Level 2 EVSE after replacement.
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
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