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ABS and ESC Warning Lights on my 2017 Audi A6

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Tom H. · rep 0 · May 22, 4:26 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A6 Prestige

Hello forum,

I'm having an issue with my 2017 Audi A6 Prestige. Recently, both the ABS and ESC (Electronic Stability Control) warning lights have illuminated on my dashboard. They came on simultaneously while I was driving normally, and they haven't gone off since. The brake pedal also feels a bit different, maybe a little softer, but the car still stops.

I've checked the brake fluid level, and it seems fine. I'm worried this could be a major problem. Has anyone experienced this with their A6 or other Audi models? What could be the cause, and is it safe to drive like this?

Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:26 AM

0

ClearTheCode admin answer:

Simultaneous illumination of the ABS and ESC warning lights on your 2017 Audi A6 Prestige is a clear indication of a fault within the vehicle's braking and stability control systems. While the car may still stop, the critical safety features of ABS and ESC are likely disabled, making it unsafe to drive for extended periods or in adverse conditions.

Here are the most common causes and diagnostic steps:

  1. Wheel Speed Sensor Failure: This is the most frequent cause. Each wheel has a sensor that monitors its rotational speed. If one fails, the ABS/ESC module loses crucial data, triggering the lights. Common OBD codes include C0031-C0035 (for specific wheel speed sensor faults).
  2. ABS Module Failure: The Anti-lock Braking System (ABS) control module is a complex electronic unit. If it malfunctions, it can disable both ABS and ESC. This is a more expensive repair but not uncommon on older vehicles. OBD codes like C1028 (ABS Control Module Malfunction) might appear.
  3. Brake Fluid Level/Pressure Sensor: Although you checked the fluid, a faulty brake fluid level sensor or a brake pressure sensor within the master cylinder could also trigger these lights. Low fluid can also cause this, but you've ruled that out.
  4. Steering Angle Sensor: The ESC system relies on the steering angle sensor to determine the driver's intended direction. A fault here can disable ESC and sometimes ABS. OBD codes like C1210 (Steering Angle Sensor Fault) are possible.
  5. Wiring Issues: Damaged wiring or connectors to any of these sensors or the ABS module can also cause intermittent or permanent faults.

When to See a Shop:

  • Immediately. Driving with disabled ABS and ESC significantly compromises your vehicle's safety features. While normal braking might still function, emergency braking and stability control will not.
  • Have a professional shop perform a diagnostic scan using an Audi-specific tool (like VCDS or ODIS). Generic OBD-II scanners might not read all the specific ABS/ESC codes. The codes will pinpoint the exact sensor or module that has failed. Based on the diagnostic codes, the technician can accurately determine if it's a sensor replacement, wiring repair, or a more involved ABS module repair.
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