Low-voltage power system
Atto 3
- Color
- Red
- Urgency
- Immediate
Most lamps light for a few seconds when you power the car on. That check is not a fault by itself. This page does not replace the owner’s manual for your model year and market.
What it means
This is the 12-volt side of the car, not the large traction-battery gauge. It reports the converter that feeds the low-voltage system and the small auxiliary battery. While driving, a steady lamp means that supply is not healthy. During charging, the same lamp can mean the charge equipment or the on-board charger has a fault.
What to do
Turn off the air conditioning and the fans to reduce the load, stop in a safe place, and arrange a check. If you keep driving, steering assist, lights, and the ability to shut down cleanly can fade as the auxiliary battery drops. Plugging in the high-voltage charge port does not, by itself, repair a failed low-voltage supply.
Related lamps
Common questions
- Is this the high-voltage battery running out?
- No. State of charge for the traction battery is the percent or range display. This lamp is the small auxiliary system that runs the computers, lights, and control units.
- Why turn off the air conditioning?
- The climate system is a large extra load on a supply that is already failing. Switching it off, and the fans, gives you more chance to pull over before the low-voltage battery is flat.