P3403high severityPowertrain
Onboard Charger Communication Error with BMS
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The onboard charger has lost communication with the battery management system. The BMS provides charge voltage and current limits to the OBC.
Symptoms
- Charging stops unexpectedly
- No charge session initiated
- Communication fault displayed
- BMS and OBC codes present simultaneously
- Intermittent charging
Common causes
- CAN bus wiring fault between OBC and BMS
- OBC communication module failure
- BMS communication module failure
- CAN bus termination issue
- Software incompatibility after update
Diagnostic steps
- Check CAN bus communication between OBC and BMS
- Inspect CAN wiring for damage
- Test CAN bus termination resistance
- Check for BMS communication codes
- Verify software versions of OBC and BMS
Repair notes
Repair CAN bus wiring. Replace OBC or BMS communication module if faulty.
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P0010
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P0013
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P0014
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P0015
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