What this usually means
A BYD Dolphin that will not wake up is commonly a 12V auxiliary battery or low-voltage system issue, not main battery failure. Load-test the 12V battery and scan low-voltage faults first.
What to ask the workshop before approving repair
- • Show the diagnostic fault codes.
- • Show photo/video proof of the failed part.
- • Give an itemised quote for parts and labour.
- • Explain why cheaper common fixes were ruled out.
- • Use/confirm: EV diagnostic scanner
- • Use/confirm: 12V battery load tester
This is not a final diagnosis. It is a money-saving checklist before you go workshop.