2004 Audi S4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2004 Audi S4 and How to Fix Them

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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 2004 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 2004 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2004 Audi S4?

When faced with a non-functional cruise control in your 2004 Audi S4, it's crucial to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown fuse is a common and easily fixable issue that can disrupt the system. Next, inspect the cruise control buttons on the steering wheel; ensure they are responsive and not stuck, as malfunctioning buttons can prevent engagement. Following this, verify the speed sensors, which play a vital role in maintaining speed; faulty sensors can lead to cruise control failure. Utilizing a diagnostic scanner to check for error codes can provide insights into specific problems within the cruise control system. Additionally, examine the vacuum lines for any leaks or damage, as these can significantly impact the system's performance. Finally, test the cruise control module itself, as a malfunction here can be the root cause of the issue. By methodically working through these steps, you can effectively diagnose and potentially resolve the cruise control problem in your Audi S4.

What are the common problems that could cause the cruise control to stop working in a 2004 Audi S4?

When the cruise control in a 2004 Audi S4 ceases to function, it can be frustrating, but understanding the common problems can guide you in diagnosing the issue. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to signal that the brake pedal is pressed. Additionally, a defective cruise control module may hinder the system's ability to operate correctly, leading to complete disengagement. Another area to inspect is for vacuum leaks, as these can disrupt the necessary vacuum pressure for the cruise control to function effectively. Furthermore, a malfunctioning speed sensor can result in inaccurate speed readings, causing the cruise control to misbehave. Lastly, don’t overlook potential electrical issues, such as damaged wiring or blown fuses, which can also impede the system's operation. By systematically checking these components, you can identify and address the root cause of your cruise control problems, restoring functionality to your Audi S4.

How urgent is it to address the non-functioning cruise control in a 2004 Audi S4?

When it comes to a non-functioning cruise control in a 2004 Audi S4, the urgency to address the issue cannot be overstated. Ignoring this malfunction can lead to significant safety risks, as the cruise control system is designed to maintain a steady speed, which is especially important during long drives or highway travel. A sudden loss of control over speed can result in dangerous driving conditions, increasing the likelihood of accidents. Additionally, a malfunctioning cruise control can detract from the overall comfort and convenience of your driving experience, making long trips more tiring and less enjoyable. Moreover, this issue may be indicative of deeper problems within the vehicle's electrical system or engine, which could escalate into more severe and costly repairs if left unaddressed. Therefore, for DIY enthusiasts, it is crucial to prioritize the repair of the cruise control system not only for immediate safety and comfort but also to prevent potential long-term damage to the vehicle. Taking action promptly can save time, money, and ensure a safer driving experience.

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