Audi battery warning light may come on while driving or when the vehicle is stared. In this guide, you will find instructions on how to check Audi battery, alternator and charging system yourself. These instructions are meant to help Audi owners of various models including A1 A3 A4 A5 A6 A7 Q3 Q5 Q7 TT.
Audi battery and alternator problems
- Audi battery light stays on
- Alternator won't charge the battery
- Audi keeps dying or won't start
- Audi keeps shutting off after a few minutes
- Engine slow to turn over
- Electrical issues and warning on dashboard
- Lights dim or flickering
- Audi stalls or is hard to start
- Battery keeps on dying
Audi battery warning light may be red or yellow. First, let's take a look at the color meaning of the battery symbol.
Audi YELLOW Battery Light
If you notice a yellow battery symbol on the instrument cluster of your Audi, it means the battery voltage has dropped below the recommended range. This can happen if you forget the lights on or listen to the radio with the engine off. To protect the battery, some electronics may be disabled.
A message may display on the instrument cluster stating LOW battery: Battery will be charged while driving. Start your Audi and drive it for at least 30 minutes to charge the battery. Keep electronic consumers to a minimum while the light is on. The yellow battery light should go off on its own when driving once the battery is charged.
If the battery capacity drops too much, you may need to jump start your Audi. If you keep getting the yellow battery light, it is often an indication that the battery is not holding a charge. In most cases, this is due to the age of the battery. Follow instructions in the next section to check the operation of the battery.
Audi RED Battery Light
If red Audi battery light comes on and stays on in your Audi instrument cluster, it indicates that there is a problem with the alternator, battery or charging system. If the alternator is not charging the battery, your Audi may only run for a brief time off the battery then shut off. The battery warning light may go away randomly if there is a loose connection.
When your Audi battery light is on, the first preventative step is to turn off any unnecessary electronic consumers. Turn off lights if driving during the day. Turn off the radio, blower fan, heated seat and unplug any chargers from the cigarette outlet. By turning off systems that use the battery, you may be able to keep your Audi running longer.
In some cases, Audi battery light and temperature warning light will turn on. The temperature warning comes on because the coolant pump stops working. This is extremely dangerous and can lead to engine overheating. Do not continue to drive your Audi or you will blow the head gasket and damage the engine. Turn your Audi off immediately and have the car towed.
Test Audi Battery / Alternator / Charging System
Audi electrical issues can be tricky and challenging to figure out. The first step in troubleshooting Audi battery problems is to check the charging system including the battery and alternator. Your dealer or auto mechanic can perform this test. In this guide, you will also find instructions on how to test Audi battery and charging system yourself.
What you will need
To perform Audi charging system test yourself you will need a Charging System Analyzer.
Park your Audi in a safe area. Set the parking brakes and turn off the ignition.
Pull the hood release under the dashboard and open the hood.
Locate the battery. Newer Audi have a plastic cover on top of the battery. If necessary remove the cover to access the positive and negative terminals of the battery.
Connect the red clamp on the positive battery terminal.
Connect the negative clamp on the negative terminal.
Perform battery and alternator test procedure. Hopefully, the problem is an easy fix such as a bad battery. Follow this guide to learn how to change Audi battery. If Audi battery light remains on, carry out the charging system test again. If the battery light remains on, the issue could be a bad alternator, poor ground connection, blown fuse, bad relay or a parasitic draw.