2020 Audi S8 Cruise Control Isn't Working

Diagnosing Common Issues with Cruise Control in Your 2020 Audi S8 and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2020 Audi S8 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Audi S8 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

What steps should I take to diagnose the non-functioning cruise control in my 2020 Audi S8?

To effectively diagnose the non-functioning cruise control in your 2020 Audi S8, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, examine the cruise control buttons on your steering wheel to ensure they are operational, as malfunctioning buttons can hinder functionality. Following this, verify the speed sensors, as faulty sensors can disrupt the cruise control system. It’s also essential to check the brake pedal switch, since a defective switch can disable cruise control entirely. If these initial checks do not resolve the issue, utilize an OBD-II scanner to identify any error codes that may provide insight into the problem. Should you still be unable to diagnose the issue, seeking assistance from a professional mechanic or an Audi dealership is recommended for a comprehensive evaluation and repair. This methodical approach not only helps in identifying the problem efficiently but also saves time and resources in the troubleshooting process.

What are the common problems that could cause the cruise control to stop working in a 2020 Audi S8?

When troubleshooting the cruise control system in a 2020 Audi S8, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can hinder the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can disrupt cruise control functionality, as the system is designed to disengage when the brake pedal is pressed. Another potential culprit is a malfunction in the throttle control system, which may involve a faulty throttle position sensor or actuator, affecting the cruise control's performance. Electrical issues, such as blown fuses or wiring problems, can also impede the system's operation, as can software glitches within the vehicle's onboard computer. By identifying and addressing these common issues, DIY enthusiasts can effectively diagnose and potentially resolve cruise control problems, ensuring a smoother and more enjoyable driving experience.

How urgent is it to address the non-functioning cruise control in a 2020 Audi S8?

When it comes to the non-functioning cruise control in a 2020 Audi S8, understanding the urgency of the situation is crucial for any DIY enthusiast. While the immediate safety risks may not be apparent, neglecting this issue can lead to a range of inconveniences and potential complications. A malfunctioning cruise control system can detract from the overall driving experience, especially during long trips where maintaining a consistent speed is essential for comfort and fuel efficiency. Furthermore, ignoring the problem could result in additional wear on the vehicle's components, potentially leading to more significant and costly repairs down the line. By addressing the cruise control issue promptly, you not only enhance your driving experience but also help preserve the performance and value of your Audi S8. Therefore, while it may not seem like an emergency, taking action sooner rather than later is advisable to avoid further complications.

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