MG4 Common Problems & Software Campaigns (2022–present)
The MG4’s problems are overwhelmingly electrical and software, not mechanical. There is one UK recall (the superlock fault), one important software service campaign from February 2025 fixing dangerous lane-assist behaviour, and a cluster of owner-reported patterns led by 12V battery trouble and home-charging quirks. In the 2024 What Car? reliability survey the MG4 scored 63.8% — last of 18 cars in the electric class — with bodywork and non-motor electrics the main culprits. Here is what is documented and what to do about each item.
Official recall — check your VIN
| Market | Reference | Issue | Fix |
|---|---|---|---|
| United Kingdom | R/2022/355 | The “superlock” double-lock can engage while the car is in ready mode — risking occupants being locked inside a running car. | Free dealer software fix (January 2023 campaign). |
Source: DVSA recall archive. Check your car: gov.uk/check-vehicle-recall.
The lane-assist software campaign — February 2025
Consumer-magazine Which? lab-tested the MG4 and found its lane-keep assistance could steer toward oncoming traffic on narrow roads. MG developed a software update with the UK’s Vehicle Certification Agency and confirmed on 6 February 2025 that it had been issued — as a service campaign, not a recall: it is installed during any scheduled maintenance visit. If your MG4 predates 2025 and hasn’t been serviced since February 2025, ask your dealer explicitly for the latest ADAS/lane-assist software rather than waiting for the next scheduled service.
Source: which.co.uk (February 2025), quoting MG Motor UK’s statement. Because it is not a recall, it will not appear in the recall checkers above — dealer service records are the only way to confirm it is installed.
Owner-reported patterns — not recalls, but consistent
1. 12V battery: drain and charging-system faults
The most repeated MG4 complaint across owner communities: a flat 12V auxiliary battery after the car stands unused, and a “12V Battery Charging System Fault” warning in some cases where the car stops topping up the small battery from the traction pack. It is the same family-wide pattern we document on the ZS EV problems page. If it recurs, ask for a software check and a 12V battery health test together — replacing the battery alone often doesn’t end it.
2. Home-charging quirks
Reported repeatedly: smart home chargers conflicting with the car (charging disconnects immediately — switching the charger to “dumb” mode resolves it), the car occasionally refusing to release the charging cable (a reboot or second unlock press frees it), and inconsistent rapid-charging curves. Mostly workarounds rather than dealer visits — but know them before you assume a hardware fault.
3. Infotainment and camera delays
Screen freezes (notably on cold mornings), delayed reversing-camera activation and late CarPlay hand-off are reported across model years. The What Car? survey’s finding that 37.5% of MG4 faults were bodywork and non-motor electrics matches this cluster — as do the cabin rattles and, for some owners, mild condensation inside headlight units after rain.
4. Climate system dropping out (less documented)
A smaller number of reports describe the air-conditioning or heat-pump compressor going offline intermittently with a voltage or software fault, then returning. We list it with that caveat — it is the least corroborated pattern on this page.
Pattern sources: mgevs.com MG4 owner forum (multiple independent threads, 2022–2026); whatcar.com used MG4 reliability review (2024 survey data); which.co.uk; forum.whichmobilitycar.co.uk. Patterns are compiled from recurring independent reports — we do not republish individual posts. We deliberately exclude battery-degradation percentage claims circulating on blogs: no methodologically sound public dataset supports them.
What the MG4 does not have
No traction-battery recall, no drive-motor failure pattern, and no brake or airbag recall in either market as of the date below. The powertrain itself has a strong reliability record in owner communities; the weak points are the 12V system, software and trim.
Buying used — 5-minute checklist
- Confirm superlock recall R/2022/355 was completed (UK cars).
- Ask for proof the February 2025 lane-assist update is installed — it’s not in recall checkers.
- Check 12V battery age and any charging-fault history.
- Test the full charge-unlock cycle on an AC charger if you can.
- Work every screen function on a cold start.