2003 Audi RS6 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Audi RS6 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 2003 Audi RS6 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 2003 Audi RS6 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 steps to diagnose the cruise control issue in a 2003 Audi RS6?

To effectively diagnose a cruise control issue in a 2003 Audi RS6, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to malfunctions. Utilizing a diagnostic scanner to check for error codes in the vehicle's onboard computer can provide valuable insights into specific issues affecting the cruise control system. Additionally, verify the functionality of the speed sensors, as they are critical for the cruise control to operate correctly. It's also important to examine the wiring connections associated with the cruise control system for any signs of damage or corrosion, as poor connections can hinder performance. Finally, test the cruise control module to confirm it is sending and receiving signals properly, as a malfunctioning module can be the root cause of the problem. By following this structured diagnostic approach, you can effectively identify and address the cruise control issues in your Audi RS6.

What are the common problems that could cause the cruise control to stop working in a 2003 Audi RS6?

When troubleshooting the cruise control system in a 2003 Audi RS6, it's essential to consider several common problems that could be at play. One of the first components to check is the cruise control switch, as a malfunction here can prevent the system from engaging or disengaging properly. Additionally, the brake pedal switch is crucial; if it's defective, it may not signal the cruise control system correctly, leading to unexpected disengagement. Another critical area to inspect is the speed sensor, as any inaccuracies in speed readings can hinder the cruise control's ability to maintain a set speed. Furthermore, vacuum leaks can disrupt the system's operation, affecting the engine's ability to sustain a steady speed. Lastly, the throttle actuator should be examined, as issues with this component can result in erratic throttle adjustments, impacting the cruise control's performance. By systematically checking these components, DIYers can often identify the root cause of cruise control issues and take appropriate steps to resolve them.

How urgent is it to address the non-functioning cruise control in a 2003 Audi RS6?

When it comes to the non-functioning cruise control in a 2003 Audi RS6, understanding the urgency of the situation is crucial for any DIY enthusiast. While it may not seem like an immediate emergency, neglecting this issue can lead to more significant problems down the line. The cruise control system is not just a luxury; it plays a vital role in maintaining a consistent speed, which is essential for long drives and highway travel. If the cruise control is malfunctioning, it could indicate deeper electronic issues that might affect other critical systems in your vehicle. By addressing the problem promptly, you not only enhance your driving experience but also prevent potential safety risks and costly repairs in the future. Therefore, taking the time to diagnose and fix the cruise control issue can save you from the inconvenience of manual speed control and ensure that your Audi RS6 remains in optimal condition.

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2003 Audi RS6 Cruise Control Issues: Causes & Repairs