2003 Audi A4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Audi A4 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 A4 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 A4 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 2003 Audi A4?

When troubleshooting the non-functioning cruise control in a 2003 Audi A4, it's essential to adopt a methodical 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 that can halt the system's operation. Next, inspect the cruise control buttons on the steering wheel to ensure they are functioning correctly, as faulty buttons can prevent engagement. Following this, verify the speed sensors, which are critical for the cruise control's performance; any malfunction here can disrupt the system. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into specific problems affecting the cruise control. Additionally, inspect the vacuum lines for leaks, as these can significantly impact the system's functionality. Finally, ensure that all wiring connections related to the cruise control are secure and free from corrosion, as loose or damaged wiring can lead to malfunctions. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issue in your Audi A4.

What are the common problems that could cause the cruise control to stop working in a 2003 Audi A4?

When dealing with a malfunctioning cruise control system in a 2003 Audi A4, it's essential to understand the common problems that could be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal when the brake pedal is pressed. Additionally, vacuum leaks within the system can disrupt its ability to maintain speed, leading to inconsistent performance. Another critical component to check is the speed sensor; if it's defective, it may provide inaccurate speed readings, causing the cruise control to malfunction. Throttle-related issues, such as a sticky throttle or problems with the throttle position sensor, can also hinder the system's operation. Lastly, don't overlook potential electrical problems, including blown fuses or wiring issues, which can significantly impact the cruise control's functionality. By systematically addressing these areas, DIYers can effectively troubleshoot and resolve cruise control issues in their Audi A4.

How urgent is it to repair the non-functioning cruise control in a 2003 Audi A4?

When it comes to the urgency of repairing the non-functioning cruise control in a 2003 Audi A4, several critical factors come into play. First and foremost, safety is paramount; a malfunctioning cruise control system can lead to erratic vehicle behavior, such as unexpected acceleration or deceleration, which poses significant risks on the road. Additionally, the comfort and convenience that cruise control offers during long drives cannot be overlooked. Without it, drivers may experience increased fatigue and discomfort, detracting from the overall driving experience. Furthermore, addressing this issue promptly can help maintain the vehicle's resale value. Prospective buyers are often wary of unresolved mechanical problems, and a non-functioning cruise control system could be a red flag. Therefore, while the urgency may vary based on individual circumstances, it is generally advisable to prioritize the repair of cruise control to ensure safety, enhance driving comfort, and protect the vehicle's value.

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2003 Audi A4 Cruise Control Issues & Repairs | RepairPal