2018 Audi A8 Quattro Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2018 Audi A8 Quattro

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Reviewed by
Bo Fader
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 2018 Audi A8 Quattro 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 2018 Audi A8 Quattro 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 are the steps to diagnose the non-functioning cruise control in a 2018 Audi A8 Quattro?

To effectively diagnose the non-functioning cruise control in your 2018 Audi A8 Quattro, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box; a blown fuse is a straightforward fix that can often resolve the issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can disrupt functionality. Following this, verify the speed sensors, as they are critical for cruise control operation; any malfunction here can lead to system failure. Additionally, check the brake pedal switch, which is essential for the cruise control system to engage properly. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes that may indicate specific issues within the cruise control system. Finally, inspect the wiring and connections for any signs of damage or looseness, as faulty wiring can also contribute to the malfunction. By following this structured diagnostic approach, you can efficiently identify and address the underlying issues affecting your vehicle's cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2018 Audi A8 Quattro?

When troubleshooting the cruise control system in a 2018 Audi A8 Quattro, it's essential to understand the common problems that may lead to its malfunction. One of the primary culprits is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, issues with the brake light switch can pose significant challenges, as this switch is designed to deactivate the cruise control when the brake pedal is pressed; a malfunction here can lead to erratic behavior or complete failure of the system. Another potential issue lies within the throttle control system, where a defective throttle position sensor or actuator can hinder the cruise control's performance. Electrical problems, such as blown fuses or wiring faults, can also interrupt the cruise control's operation, as can software glitches within the vehicle's onboard computer, which may require a reset or update. By identifying and addressing these common issues, you can effectively troubleshoot and restore functionality to the cruise control system in your Audi A8 Quattro.

How urgent is it to address the malfunctioning cruise control in my 2018 Audi A8 Quattro?

Addressing the malfunctioning cruise control in your 2018 Audi A8 Quattro is of utmost importance due to the immediate safety risks it poses. A faulty cruise control system can lead to unexpected acceleration or deceleration, increasing the likelihood of accidents on the road. Moreover, neglecting this issue can exacerbate the problem, potentially causing damage to other vehicle components, which may result in more extensive and costly repairs down the line. Additionally, a properly functioning cruise control system enhances your driving experience by providing comfort and efficiency during long journeys. Therefore, it is crucial to prioritize the repair of your cruise control system not only for your safety but also to maintain the overall performance and convenience of your vehicle.

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2018 Audi A8 Quattro Cruise Control Issues & Solutions