2018 Audi A5 Quattro Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2018 Audi A5 Quattro

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Reviewed by
Devin Cabugcal
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 A5 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 A5 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 initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2018 Audi A5 Quattro?

When troubleshooting the non-functioning cruise control in a 2018 Audi A5 Quattro, it's crucial to follow a structured diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common culprit that can easily be replaced. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can prevent the system from engaging properly. After that, verify the functionality of the speed sensors, since any faults here can disrupt the system's ability to maintain speed. Utilizing a diagnostic scanner to check for error codes can also provide critical insights into specific problems affecting the cruise control system. Additionally, ensure that the brake and clutch switches are functioning correctly, as any malfunction in these components can inhibit the activation of cruise control. Lastly, inspect the wiring and connections related to the cruise control system for any signs of damage or corrosion, as poor connections can lead to communication failures. By systematically addressing these areas, you can effectively identify and resolve the underlying issues with your cruise control system, ensuring a smoother driving experience.

What are the common problems that could cause the cruise control to stop working in a 2018 Audi A5 Quattro?

When the cruise control in a 2018 Audi A5 Quattro ceases to function, several common problems may be at play. One of the primary culprits is a faulty speed sensor, which is crucial for the system to accurately gauge the vehicle's speed. If this sensor malfunctions, the cruise control may fail to engage or maintain the desired speed. Another frequent issue arises from the brake light switch; if this switch is defective, it can disrupt the cruise control's operation since the system is designed to disengage when the brake pedal is pressed. Additionally, problems with the throttle control system, such as a malfunctioning throttle position sensor, can hinder the cruise control's ability to sustain a constant speed. Electrical issues, including blown fuses or wiring problems, can also prevent the cruise control from functioning properly. Lastly, software glitches within the vehicle's onboard computer may lead to unexpected cruise control malfunctions. By understanding these potential issues, DIYers can better diagnose and address the problems affecting their vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2018 Audi A5 Quattro?

Addressing the malfunctioning cruise control in your 2018 Audi A5 Quattro is of utmost importance due to the immediate safety risks it poses. A malfunction can lead to unexpected changes in speed, increasing the likelihood of accidents and creating hazardous driving conditions. Beyond safety, neglecting this issue can adversely affect your vehicle's performance; a malfunctioning system may strain the engine or other components, leading to more extensive and costly repairs down the line. Additionally, maintaining the functionality of all systems, including cruise control, is crucial for preserving the resale value of your Audi. Prospective buyers are likely to be deterred by known issues, which can significantly impact your vehicle's marketability. Therefore, it is essential to prioritize the repair of your cruise control system to ensure safe driving, optimal performance, and the long-term value of your vehicle.

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