2009 Audi TTS Quattro Cruise Control Isn't Working

Fixing Cruise Control Issues in 2009 Audi TTS Quattro

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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 2009 Audi TTS Quattro 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 TTS Quattro 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.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2009 Audi TTS Quattro?

When faced with a non-functioning cruise control in a 2009 Audi TTS Quattro, it's crucial to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can hinder engagement. It's also important to verify the functionality of the speed sensors, as any faults here can disrupt the entire cruise control system. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into specific problems affecting the cruise control. Additionally, examine the brake and clutch switches, as these components are vital for the cruise control's operation; faulty switches can prevent activation. Lastly, inspect the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as compromised wiring can lead to malfunctions. By following these steps, you can effectively troubleshoot the cruise control issue and determine whether further professional assistance is needed.

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

When the cruise control in a 2009 Audi TTS Quattro ceases to function, several common problems may 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, issues with the speed sensor can result in inaccurate speed readings, further complicating the cruise control's operation. Another frequent issue is a malfunctioning brake light switch; since this component is designed to disengage cruise control when the brakes are applied, any faults here can disrupt the entire system. Vacuum leaks can also pose a problem, as they may prevent the cruise control from maintaining a consistent speed. Furthermore, a faulty throttle actuator can affect the system's ability to adjust throttle position accurately, leading to erratic behavior. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the functionality of the cruise control system. By understanding these common issues, DIYers can effectively troubleshoot and resolve cruise control problems in their Audi TTS Quattro.

How urgent is it to address the non-functioning cruise control in a 2009 Audi TTS Quattro?

When it comes to the non-functioning cruise control in a 2009 Audi TTS Quattro, addressing the issue should not be overlooked, even if it may not seem as urgent as other mechanical failures. While the immediate safety risks may not be as pronounced as those associated with brake or engine problems, the implications of a malfunctioning cruise control can still significantly affect your driving experience. Relying solely on manual speed control can lead to increased driver fatigue, especially during long trips, and may result in inconsistent speed management that could inadvertently affect fuel efficiency. Moreover, neglecting this issue could lead to further complications down the line, potentially escalating repair costs. Therefore, it is advisable to have the cruise control system diagnosed and repaired promptly by a qualified mechanic to restore its functionality, ensuring a safer, more comfortable, and efficient driving experience.

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