2018 Audi A4 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 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 2018 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 2018 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.

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 steps should I take to diagnose the cruise control issue in my 2018 Audi A4?

When diagnosing a cruise control issue in your 2018 Audi A4, it's crucial to follow a methodical diagnostic approach that prioritizes simpler checks before moving on to more complex solutions. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, check the functionality of the cruise control buttons on the steering wheel, since malfunctioning buttons can prevent proper engagement. Utilizing an OBD-II scanner to retrieve any error codes is essential, as these codes can provide insights into specific problems within the cruise control system. Additionally, ensure that the speed sensors are functioning correctly, as they are integral to the cruise control's performance. It's also wise to examine the wiring and connections for any signs of wear or corrosion, as these issues can impede the system's effectiveness. Testing the cruise control module is another important step, as a faulty module can prevent the system from engaging. If these initial checks do not resolve the issue, seeking assistance from a professional mechanic or an authorized Audi service center is recommended for a thorough diagnosis and repair. By adhering to this structured approach, you can effectively troubleshoot 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 2018 Audi A4?

When troubleshooting cruise control issues in a 2018 Audi A4, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake pedal switch, which is crucial for disengaging the cruise control when the brake is applied; if this switch malfunctions, it can prevent the system from engaging properly. Additionally, the speed sensor plays a vital role in the cruise control's functionality, as it provides the necessary speed readings; any issues here can lead to failure. Another potential issue is a blown fuse within the cruise control system, which can halt its operation entirely and is often a straightforward fix. Furthermore, the cruise control module itself may be defective, necessitating repair or replacement to restore functionality. Lastly, a malfunctioning throttle actuator can disrupt the system's ability to maintain speed, requiring further investigation. If you're experiencing cruise control problems, identifying these common issues can help you determine whether a DIY fix is feasible or if professional assistance is needed.

How urgent is it to address the malfunctioning cruise control in my 2018 Audi A4?

When it comes to the malfunctioning cruise control in your 2018 Audi A4, the urgency of addressing the issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating hazardous driving conditions that could result in accidents. Moreover, such issues may signal deeper problems within your vehicle's electronic systems or sensors, which can compromise overall performance and safety. Ignoring these symptoms not only risks your safety but can also lead to increased fuel consumption and potential damage to other vehicle components, ultimately resulting in higher repair costs. Therefore, it is crucial to diagnose and repair cruise control malfunctions promptly to ensure your safety, maintain your vehicle's performance, and avoid more significant issues down the line.

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