MG4 MY23: Flashing high-voltage battery warning light and overheating response

MG4 MY23: Flashing high-voltage battery warning light and overheating response

Symptoms

• The high-voltage battery malfunction warning light flashes. ^[1]

Possible causes

• The official manual associates a flashing light with excessive high-voltage battery temperature; a steady light instead indicates a battery fault. Do not treat them as the same root cause. ^[1]

Checks

• Distinguish a flashing light from a steady light; if it flashes, stop as soon as it is safe to do so, switch off the vehicle power and leave the vehicle immediately. ^[1]

What to do

• Contact an MG service provider as soon as possible; the manual does not identify a component-level root cause. Do not directly recommend replacing the battery, pump or sensor based on this light. ^[1]

Applicability and limits

• Source limits: MG MG4, model year 2023, European MY23 English-language manual; only applies to configurations covered by the MY23 manual; this does not reinstate the original 6 mechanical diagnostic entries. For inspection guidance only; related parts do not constitute a recommendation to replace them. No vehicle model is linked; do not assume applicability to other models of the same brand. Scope: unknown ^[1]
• Only applies to configurations covered by the MY23 manual; this does not reinstate the original 6 mechanical diagnostic entries

Related part categories

• Traction battery ^[1]

Sources

[Source 1] MG4 MY23 English-language owner manual from the official European website — PDF/printed p.48, High Voltage Battery Pack Malfunction Indicator (accessed 2026-11-01)
https://cdn.mgmotor.eu/manuals/EU-MG4-MY23_Owner-Manual-20230907_compressed.pdf