MG HS stop-start unavailable after battery disconnection: Battery status recalibration incomplete

MG HS stop-start unavailable after battery disconnection: Battery status recalibration incomplete

Symptoms

• The stop-start function is inhibited after the battery negative terminal is reconnected. ^[1]

Possible causes

• After reconnection of the negative terminal, the vehicle was not locked and left undisturbed for 4 hours as required by the manual, leaving battery status recalibration incomplete. ^[1]

Checks

• Check whether the battery negative terminal has recently been disconnected and reconnected, and whether the requirement to lock the vehicle and leave it undisturbed for 4 hours was met afterwards. ^[1]

What to do

• Complete the manual's required recalibration process by locking the vehicle and leaving it undisturbed for 4 hours; do not directly replace the battery or stop-start components based on this. ^[1]

Applicability and limits

• MG HS English-language owner's manual from the official European website, file version identifier 01-2023; only applies to combustion-engine configurations equipped with stop-start whose battery negative terminal has recently been reconnected. A production model-year range has not been established. Scope: unknown ^[1]

Sources

[Source 1] MG HS English-language Owner's Manual from the Official European Website (file identifier 01-2023) — printed pp.275 (PDF pp.291): Battery Maintenance (accessed 2026-10-30)
https://cdn.mgmotor.eu/manuals/MG-HS-owner-manual-01-2023.pdf