2008 Audi RS4 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2008 Audi RS4

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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 2008 Audi RS4 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 2008 Audi RS4 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 2008 Audi RS4?

When troubleshooting the non-functioning cruise control in a 2008 Audi RS4, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse in the fuse box, as a blown fuse can often be the simplest explanation for the malfunction. Next, verify that the cruise control settings are correctly configured on the control stalk or steering wheel buttons, ensuring that the system is activated properly. If these initial checks do not resolve the issue, use a diagnostic scanner to look for any error codes that may indicate specific problems within the cruise control system. Additionally, inspect the cruise control switch on the steering wheel for any signs of damage or malfunction, as this component is crucial for operation. Finally, do not overlook the brake pedal switch; if it is stuck or malfunctioning, it can prevent the cruise control from engaging. By following these steps, you can effectively narrow down the potential causes of the cruise control issue and take appropriate action to restore functionality.

What are the common problems that could cause the cruise control to stop working in a 2008 Audi RS4?

When the cruise control in a 2008 Audi RS4 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty cruise control switch, which may fail to engage or disengage the system properly. Additionally, issues with the speed sensor can lead to incorrect speed readings, preventing the cruise control from operating as intended. Another common problem is a malfunctioning brake light switch; since this component is designed to disengage the cruise control when the brakes are applied, any faults here can disrupt the entire system. Furthermore, vacuum leaks can significantly impact the cruise control's ability to maintain a steady speed, while a faulty throttle actuator may hinder the system's capacity to adjust the throttle position correctly. By systematically checking these components, you can identify the root cause of the cruise control malfunction and take the necessary steps to restore its functionality.

How urgent is it to address the malfunctioning cruise control in my 2008 Audi RS4?

When it comes to the malfunctioning cruise control in your 2008 Audi RS4, the urgency of addressing this issue cannot be overstated. A malfunctioning system can lead to unpredictable acceleration or deceleration, posing significant safety risks, especially during highway driving where maintaining a consistent speed is crucial. Additionally, the inconvenience of having to manually control your speed can detract from the overall driving experience, making long trips more stressful. Ignoring these symptoms may also result in increased fuel consumption, as inconsistent speed can lead to higher operational costs over time. Furthermore, delaying repairs could exacerbate the problem, potentially leading to more extensive damage to your vehicle's systems, which could be costly to fix. Therefore, it is essential to prioritize the diagnosis and repair of your cruise control system to ensure not only your safety but also the longevity and efficiency of your Audi RS4.

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