2009 Audi S4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2009 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 2009 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 2009 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 2009 Audi S4?

When diagnosing a cruise control issue in a 2009 Audi S4, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse is a common and easily rectifiable problem that can disrupt the system's functionality. Next, assess the cruise control buttons on the steering wheel to ensure they are working correctly, since malfunctioning buttons can lead to operational issues. Utilizing a diagnostic scanner to retrieve error codes from the vehicle's onboard computer can provide critical insights into any faults within the cruise control system. Additionally, checking the speed sensors is vital, as they play a key role in the system's performance. It's also important to examine the wiring connections for any signs of wear, damage, or corrosion, as these can significantly impact the cruise control's operation. Finally, testing the cruise control module will help determine if it is functioning properly and effectively communicating with other components. By systematically following these steps, you can effectively diagnose and address cruise control issues in your Audi S4, ensuring a smoother driving experience.

What are the common problems that could cause the cruise control to stop working in a 2009 Audi S4?

When troubleshooting cruise control issues in a 2009 Audi S4, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty cruise control switch, which can hinder the system's ability to engage or disengage as intended. Additionally, speed sensor issues can lead to incorrect speed readings, causing the cruise control to malfunction. Another critical component is the brake light switch; if this switch is malfunctioning, it may disrupt the cruise control system since it is designed to deactivate the cruise control when the brakes are applied. Vacuum leaks can also pose a problem, as they can prevent the system from maintaining a consistent speed. Furthermore, a faulty throttle actuator may impede the cruise control's ability to adjust the throttle position correctly. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the functionality of the cruise control system. By identifying and addressing these common issues, you can effectively troubleshoot and potentially resolve the cruise control problems in your Audi S4.

How urgent is it to address the malfunctioning cruise control in a 2009 Audi S4, considering potential safety risks and further damage?

Addressing a malfunctioning cruise control system in a 2009 Audi S4 is of utmost urgency due to the significant safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, which may result in loss of control, particularly in high-speed situations such as highway driving. This unpredictability not only endangers the driver and passengers but also other road users. Furthermore, neglecting the issue can exacerbate the problem, potentially leading to more severe damage to critical components like the engine or transmission. Therefore, it is crucial to diagnose and repair any cruise control malfunctions promptly to ensure safe driving conditions and to protect the integrity of the vehicle. Taking immediate action can prevent minor issues from escalating into costly repairs, making it essential for any Audi S4 owner to prioritize this concern.

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