P0562 — System Voltage Low (BYD Context)
Written and edited by Ethan Cole, Editor-in-Chief · ✓ Technically reviewed by Daniel Wei Chen — Senior Chinese Automotive Diagnostics & Repair Specialist, Sydney · 22 August 2026.
Standard meaning: system voltage below threshold. On a BYD this code has more documentation behind it than any other: the 12V bricking pattern we’ve traced across the Seal, Sealion 6, Shark 6 and Atto 3 — cars unresponsive after parked days, with a full Blade battery watching helplessly.
What it means on your BYD
| If you drive… | The documented mechanism | First move |
|---|---|---|
| Seal (2023–24) | DC-DC converter charging the 12V at ~13.8 V — under the 14.4 V+ lead-acid needs; early sulfation. | BMS/Gateway software update + 12V health test together; owners converge on AGM replacement. |
| Sealion 6 / Shark 6 | Always-on 4G/5G and cloud features outrunning the top-up logic during parked spells. | BMS patch at the dealer; AGM if it’s recurred. |
| Atto 3 / Dolphin | Atto 3: same family pattern documented. Dolphin: not prominent in reports — we say so. | Software currency, then battery health. |
Safe owner checks
- Jump terminals live in the frunk on the Seal family — for rescue, not for diagnosis.
- Pattern timing: after parked days = top-up logic; the $30 Bluetooth 12V monitor turns anecdote into data.
- Software/BMS version current? It’s half of every documented fix.
When it’s a workshop job
Recurring episodes after a healthy battery test — ask for the BMS top-up strategy check by name. And the standing rule: the 12V and its terminals are owner territory; anything orange is not.
Code definition per SAE J2012. Pattern evidence: our BYD problems research — the mechanism detail (13.8 V DC-DC) is owner-measured, cross-referenced, and labelled in the extraction records.
Disclaimer: Information on this page is general guidance only and does not replace the manufacturer’s official documentation or the judgement of a qualified technician. Never open, touch or work on any orange high-voltage component. Fault-code behaviour varies between markets, model years and software versions. Last verified: 22 August 2026.