Is U0100 serious on a MG4?

U0100 is a moderate severity fault. Schedule a service appointment soon.

Can I drive with U0100 on my MG4?

In most cases yes, but monitor closely. If you notice loss of power or unusual noises, stop and contact your dealer.

U0100Warning

Lost Communication With ECM/PCM "A" — MG4

CAN Bus

Lost Communication With ECM/PCM "A"

Can I still drive?

In most cases, yes — but schedule a service appointment soon. Monitor the warning closely. If additional symptoms appear (loss of power, unusual noises), pull over safely and contact your dealer.

Common problems reported for MG4 →MG4 overview →

Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.