2020 Audi RS Q8 Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2020 Audi RS Q8 and How to Fix Them

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Reviewed by
Andrew Hajjar
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 RS Q8 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 RS Q8 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 RS Q8?

To effectively diagnose the non-functioning cruise control in your 2020 Audi RS Q8, 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 rectifiable issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can hinder functionality. Following this, verify the speed sensors, as faulty sensors can prevent the cruise control system from engaging properly. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into any underlying issues affecting the system. Additionally, assess the brake and clutch switches, as these components are crucial for the safe operation of cruise control and can disable the system if they are not functioning correctly. Finally, inspect the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as compromised wiring can disrupt signal transmission. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control malfunction in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Audi RS Q8?

When the cruise control in a 2020 Audi RS Q8 ceases to function, several common problems may be at play. A faulty speed sensor is often the culprit, as it can hinder the system's ability to accurately gauge the vehicle's speed, preventing engagement or consistent speed maintenance. Additionally, issues with the brake light switch can disrupt the cruise control, since this switch is designed to deactivate the system when the brake pedal is pressed; a malfunction here can lead to improper operation. Another potential issue lies within the throttle control system, where a defective throttle position sensor or electronic throttle control unit can impede the cruise control's performance. It's also essential to check for blown fuses related to the cruise control system, as replacing any damaged fuses can restore functionality. Lastly, software glitches within the vehicle's onboard computer may cause disruptions; updating or resetting the software can often resolve these issues. By systematically addressing these common problems, DIYers can effectively troubleshoot and restore the cruise control system in their Audi RS Q8.

How urgent is it to address the malfunctioning cruise control in a 2020 Audi RS Q8?

Addressing the malfunctioning cruise control in a 2020 Audi RS Q8 is of utmost importance due to the significant safety risks it poses. A malfunctioning system can lead to unexpected acceleration or deceleration, which can create dangerous driving conditions and increase the likelihood of accidents. Moreover, delaying repairs can exacerbate the issue, potentially leading to more extensive damage to the vehicle's components, resulting in costly repairs down the line. The convenience and enjoyment of driving are also compromised when cruise control is not functioning properly, detracting from the overall driving experience. Therefore, it is crucial to prioritize the diagnosis and repair of the cruise control system by a qualified professional to ensure both safety and optimal vehicle performance.

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