Investigate soonred light
Battery / Charging Warning
The battery isn’t being charged — you’re running on borrowed time.
What it means
A red battery icon with + and − terminals. The charging system (alternator, drive belt or battery) isn’t delivering the voltage the car needs. The engine keeps running on the battery alone — but only for around 20–60 minutes before everything dies.
What to do
- 1Turn off non-essential electrics (heated seats, demister, radio) to save power.
- 2Drive directly to a garage or home — don’t turn the engine off if you can avoid it; it may not restart.
- 3Get the alternator and battery tested. Don’t leave it more than a day or two.
Likely causes
- •Failing alternator
- •Snapped or slipping serpentine/auxiliary belt
- •Loose or corroded battery terminals
- •Battery at end of life
Rough UK cost
Battery: £80–£200 fitted. Alternator: £250–£600 fitted. Belt: £80–£200.
Prices are a guide only — always get a written quote before any work.
Heads up: Carautonomy is for general guidance only. If your car is behaving oddly or any red light is on, get it inspected by a qualified mechanic.