Under normal conditions, the ABS light will only come on for a couple of seconds when you turn on the ignition then turn off.
It is normal for the Audi ABS light to flash a few times, for example, when the vehicle starts to slip during hard braking.
You may also see ESP, ESC (Electronic Stability Control), EDL (Electronic Differential Lock), and Brake light, along with the ABS light.
What Causes Audi ABS Light to Come On?
Common problems that cause Audi ABS light to come on include:
- defective or dirty wheel speed sensor,
- control module failure,
- bad clock spring,
- low brake fluid level,
- blown a fuse,
- bad ABS Pump or Module,
- Electronic Differential Lock (EDL) problem,
- the brake light switches are defective.
Audi ABS light may come ON if there is a problem with the Electronic Differential Lock (EDL).
What Does it Mean When Audi ABS and Brake Light Stay On?
If both the ABS and BRAKE light stay on, the problem could be life-threatening. The brakes may not function properly.
Immediate attention is required if ABS and BRAKE lights are both staying on. If your BRAKE warning light flashes on your instrument cluster, do not operate the vehicle. Audi brakes may not work, or functionality can be lost while driving.
What to do when the Audi ABS light stays on?
If your Audi ABS stays on, the first thing you need to do is check the brake fluid level.
If the brake fluid level is normal, check the sensor on the brake fluid reservoir. The level sensor on the brake fluid reservoir may have failed.
The next step is to read codes from the ABS module.
How to Diagnose and Reset Audi ABS Light
To find out why your Audi ABS light is on, you need to read the ABS module's codes.
To do this, you will need an OBD2 scanner that can read ABS fault codes.
What you will need
Park the Audi in a safe area.
- Locate the OBD-2 port under the dashboard.
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- Plug the OBD-2 scanner into the OBD2 port of your Audi.
Turn on the ignition. All Audi dashboard lights should turn on but do not start the engine. If your Audi has START/STOP button, press it twice without pressing on the brake pedal.
Turn on the scanner. Allow your Audi ABS Scan Tool to connect to the Engine Control Unit (ECU). This may take a few seconds.
- Select Audi from the menu. Next, select the Anti-lock Brake System menu.
- Read codes from the ABS module.
- Clear codes. After you fix the problem discovered in the previous step, come back to the ABS menu and clear Audi ABS codes.
Can Audi ABS Module Fail?
ABS Control Module Failure is a common issue on Audi vehicles. It triggers ABS light to come on and can affect many models, including A4 and A6.
To fix this problem, replace the Control Module or rebuilt your existing module. Another possible solution is to remove the ABS module from the vehicle and use an Audi Control Module Rebuilt Service on eBay company.