2015 Audi S4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Audi S4 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 2015 Audi S4 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 2015 Audi S4 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 cruise control issue in a 2015 Audi S4?

To effectively diagnose a cruise control issue in your 2015 Audi S4, begin with the simplest solutions. 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 to ensure they are operational, since faulty buttons can lead to engagement problems. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide insights into specific malfunctions. Following this, verify the speed sensors, as they are essential for the cruise control system's operation; faulty sensors can prevent the system from working correctly. Additionally, examine the wiring connections associated with the cruise control for any signs of damage or corrosion, as poor connections can hinder performance. Finally, if all else fails, test the cruise control module itself to confirm it is functioning properly. By following this structured approach, you can systematically identify and address the root cause of the cruise control issue in your Audi S4.

What are the common problems that could cause the cruise control to stop working in a 2015 Audi S4?

When diagnosing why the cruise control in your 2015 Audi S4 has stopped working, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty cruise control switch, which can hinder the system's ability to engage or disengage as intended. Additionally, a malfunctioning speed sensor may prevent the cruise control from maintaining the desired speed, leading to erratic performance. Another critical component is the brake light switch; if this switch is defective, it can cause the cruise control to disengage unexpectedly whenever the brakes are applied. Furthermore, issues with the throttle actuator can disrupt the system's ability to adjust the throttle position accurately, impacting overall functionality. Lastly, don't overlook potential electrical problems, such as blown fuses or wiring issues, which can significantly affect the cruise control system. By systematically checking these components, you can effectively troubleshoot and potentially resolve the cruise control issues in your Audi S4.

How urgent is it to address the non-functioning cruise control in a 2015 Audi S4?

When it comes to a non-functioning cruise control in a 2015 Audi S4, the urgency of addressing the issue cannot be overstated. While it may seem like a minor inconvenience, neglecting this problem can lead to more significant safety risks and potential damage to the vehicle's electronic systems. Cruise control is designed to enhance driving comfort and efficiency, particularly on long trips, and its malfunction could indicate deeper issues within the vehicle's electronics or sensors. For DIY enthusiasts, it’s crucial to recognize that ignoring the symptoms may not only compromise your driving experience but could also escalate into costly repairs down the line. Therefore, it is advisable to conduct a thorough inspection of the cruise control system and related components as soon as possible. This proactive approach not only ensures your safety on the road but also helps maintain the overall performance of your Audi S4, allowing you to enjoy its features without worry.

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