2018 Audi S5 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 Audi S5 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 2018 Audi S5 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 S5 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 cruise control issue in my 2018 Audi S5?

When diagnosing a cruise control issue in your 2018 Audi S5, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel for any signs of damage or wear that could hinder their operation. Utilizing an OBD-II scanner to scan for error codes is a crucial step, as these codes can pinpoint specific problems within the cruise control system. Additionally, verify the functionality of the speed sensors, since they are integral to the system's operation; faulty sensors can lead to cruise control failure. It's also important to check all wiring connections related to the cruise control system, ensuring they are secure and free from corrosion, as poor connections can cause malfunctions. If these preliminary checks do not resolve the issue, testing the cruise control module is the next step, as a malfunctioning module can prevent the system from engaging. Should you find yourself unable to diagnose the problem after these steps, consulting a professional mechanic or an authorized Audi service center is advisable for further assistance. By following this structured diagnostic approach, you can effectively identify and address the cruise control issue in your Audi S5.

What are the common problems that could cause the cruise control to stop working in a 2018 Audi S5?

When troubleshooting the cruise control system in a 2018 Audi S5, it's essential to understand the common problems that may lead to its failure. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to detect the vehicle's speed accurately, preventing it from engaging or maintaining speed. Additionally, the brake light switch plays a crucial role; if it malfunctions, the cruise control may not activate or could disengage unexpectedly when the brakes are applied. Another potential culprit is 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 issues, can also interfere with 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 troubleshoot and restore functionality to the cruise control system in their Audi S5.

How urgent is it to address the malfunctioning cruise control in a 2018 Audi S5?

Addressing a malfunctioning cruise control in a 2018 Audi S5 is of utmost importance due to the potential safety risks and performance issues it can cause. When cruise control fails, it may lead to unexpected acceleration or deceleration, which can create hazardous driving conditions. Additionally, such malfunctions may signal deeper electronic system problems that could affect other critical vehicle functions, further compromising safety. Ignoring these symptoms not only risks immediate safety but can also lead to decreased fuel efficiency and long-term damage to the vehicle, resulting in costly repairs. Therefore, it is crucial for Audi S5 owners to prioritize the diagnosis and repair of cruise control issues to ensure their vehicle operates safely and efficiently.

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2018 Audi S5 Cruise Control Issues: Diagnosis & Solutions