2001 Audi S4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2001 Audi S4 and How to Fix Them

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Reviewed by
Aisha
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 2001 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 2001 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2001 Audi S4?

When troubleshooting the non-functional cruise control in a 2001 Audi S4, 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 frequent culprit that can be easily replaced. Next, assess the functionality of the cruise control buttons on the steering wheel, since any malfunction here can disrupt the system's operation. After that, verify the condition of the speed sensors, as faulty sensors can prevent the cruise control from engaging properly. It's also important to examine the vacuum lines for any leaks or blockages, as these can significantly affect the system's performance. Utilizing a diagnostic scanner to check for error codes can provide insights into specific problems that may be impacting the cruise control system. Finally, ensure that the brake and clutch switches are functioning correctly, as these components are essential for the activation of cruise control. By systematically following these diagnostic steps, you can effectively identify and potentially resolve the issues affecting the cruise control in your Audi S4.

What are the common problems that could cause the cruise control to stop working in a 2001 Audi S4?

When troubleshooting the cruise control system in a 2001 Audi S4, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the system from engaging if it fails to detect when the brake pedal is pressed. Additionally, vacuum leaks can disrupt the system's ability to maintain a consistent speed, leading to erratic performance. Another potential issue is a defective speed sensor, which can provide inaccurate readings and cause the cruise control to malfunction. Problems with the throttle, such as a sticky throttle or issues with the throttle position sensor, can also interfere with the system's operation. Lastly, electrical problems, including blown fuses or wiring issues, can prevent the cruise control from functioning altogether. By identifying and addressing these common issues, DIY enthusiasts can effectively diagnose and resolve cruise control problems in their Audi S4.

How urgent is it to address the non-functioning cruise control in a 2001 Audi S4?

When it comes to the non-functioning cruise control in a 2001 Audi S4, understanding the urgency of the repair is crucial for both safety and vehicle performance. While the absence of cruise control may not present an immediate safety hazard, it can lead to driver fatigue during long trips, which is a significant concern. Moreover, neglecting this issue could result in more complex problems down the line, potentially affecting other systems in the vehicle. It is advisable to have the cruise control inspected by a qualified mechanic promptly to avoid any further complications that could arise from delayed repairs. Additionally, addressing this issue not only enhances the driving experience but also helps maintain the vehicle's resale value and overall reliability. Therefore, while it may not be the most critical repair, taking action sooner rather than later is beneficial for both safety and convenience.

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