Checked: 2026-07-13
BYD “Please check the OBC system” message
This message points to the on-board charging system. It is mainly a charging issue, but unsafe charging symptoms require immediate stop.
Quick answer
BYD manuals describe this as an on-board charging system fault. Check the charging connection and reconnect normal equipment only if conditions are safe. If the fault persists, or if there is heat, smoke, smell, arcing, water or damage, stop charging and contact BYD service.
Dashboard phrases covered
What the state means
Message appears during AC charging
The vehicle has detected an on-board charging fault or connection problem.
Disconnect normally, check for visible damage and reconnect only if safe.
Message repeats with known-good equipment
The issue is unlikely to be a one-time loose connection.
Stop repeated attempts and book BYD diagnosis.
Heat, smoke, smell, arcing or liquid
Charging may be unsafe.
Stop charging if safe to do so, move away and call emergency or site support as appropriate.
Vehicle drives normally after a failed charge
OBC is primarily related to charging, not automatically a driving prohibition.
Do not start another unattended charge session until the issue is understood.
Owner-safe steps
- 1Stop the charging session through the normal control or charger interface when safe.
- 2Inspect the cable, plug and charge port visually without opening or measuring components.
- 3Try a known-good compatible cable or charger only if there is no damage, heat, smell or liquid.
- 4Record AC/DC charging type, station, cable, weather, state of charge and the exact dashboard text.
- 5Contact BYD service if the message repeats or charging does not resume normally.
Do not do this
- !Do not open the charge port assembly, OBC, orange cables or high-voltage connectors.
- !Do not charge with a wet, damaged, overheated or visibly melted connector.
- !Do not disconnect the 12V battery as a reset procedure.
- !Do not clear charging-system codes without diagnosis.
Model and market notes
- The message appears in official BYD manuals as a charging-system fault prompt.
- The owner response is connection check and service escalation, not DIY electrical diagnosis.
- Driving status depends on other warnings and vehicle behaviour; charging safety remains the priority.
Related BYD warning pages
FAQ
What does Please check the OBC system mean?
It means the vehicle detected a fault related to the on-board charging system. The official response is to check the charging connection, reconnect the charging equipment and contact BYD service if the fault remains.
Is this a high-voltage repair instruction?
No. This is owner-facing charging safety guidance only. Do not open, measure or repair high-voltage charging components.
Can I drive after the OBC message appears?
The message is primarily charging-related. If the vehicle drives normally and no red safety warning is present, it is not automatically a do-not-drive message, but charging should be checked before the next session.
When should I stop charging immediately?
Stop charging if you notice heat, smoke, burning smell, arcing, liquid intrusion, damaged cable, damaged plug, damaged charge port or repeated tripping of protection equipment.
Should I try another charger?
If it is safe, you can try a known-good compatible charger and cable after disconnecting normally. If the message repeats, do not keep cycling chargers; arrange BYD service.
Can a damaged cable cause this message?
Yes. Damaged, wet, overheated or incompatible charging equipment can cause charging faults and should not be used.
Can the message appear with AC charging only?
OBC faults usually relate to AC on-board charging, but dashboard wording and charge-control logic vary by model. Record whether it happened on AC, DC, home charging or public charging.
Should I disconnect the 12V battery?
No. This page does not recommend disconnecting batteries or resetting high-voltage systems. Follow the vehicle manual and use authorised service.
What should I record before service?
Record the exact message, charging method, charger brand or station, cable type, state of charge, weather, whether the connector was wet, and whether the warning cleared after a normal reconnect.
Can software cause charging faults?
Charging faults can be caused by vehicle software, charger communication, grid supply, cable condition or hardware. Do not assume the cause without diagnosis.
Is it safe to touch the connector?
Only touch the connector for normal unplugging when there is no heat, smoke, smell, liquid or visible damage. In unsafe conditions, move away and call emergency or site support.
Will OBC faults affect DC fast charging?
The on-board charger is primarily used for AC charging. DC fast charging may behave differently, but repeated charging faults still need BYD diagnosis.
Can I clear the fault code myself?
No public owner procedure should be used to clear charging-system faults. Clearing a code without fixing the cause can hide a safety issue.
When is emergency help needed?
Use emergency help if there is smoke, fire, electrical smell, arcing, shock risk, visible melting, crash damage near the charge port or water intrusion during charging.