2018 Audi TT RS Quattro Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 Audi TT RS Quattro 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 2018 Audi TT RS 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 2018 Audi TT RS 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.

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 2018 Audi TT RS Quattro?

When diagnosing a cruise control issue in a 2018 Audi TT RS Quattro, 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 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 the system from engaging. Utilizing an OBD-II scanner to retrieve any error codes is an essential step, as it can highlight specific problems affecting the cruise control system. Additionally, assess the vehicle's speed sensors, which are vital for the cruise control's performance; any faults in these sensors can lead to significant issues. It's also important to examine the wiring connections related to the cruise control system for signs of damage or loose connections, as these can hinder proper communication within the system. Finally, testing the cruise control module itself will help determine if it is functioning correctly, as a faulty module can be the underlying cause of the issue. By adhering to this structured diagnostic process, you can effectively identify and resolve the cruise control problem in your Audi TT RS Quattro.

What are the common problems that could cause the cruise control to stop working in a 2018 Audi TT RS Quattro?

When troubleshooting the cruise control system in a 2018 Audi TT RS Quattro, it's essential to recognize the common problems that may lead to its malfunction. A faulty speed sensor is a frequent issue, as it can disrupt the system's ability to accurately gauge the vehicle's speed, preventing the cruise control from engaging or maintaining speed. Additionally, problems with the brake light switch can cause the cruise control to disengage unexpectedly when the brake pedal is pressed, creating an inconsistent driving experience. Another potential culprit is a malfunction in the throttle control system, particularly a faulty throttle position sensor, which can hinder the cruise control's ability to maintain a steady speed. Electrical problems, such as blown fuses or wiring issues, can also impede the cruise control's functionality, as can vacuum leaks within the system itself. Identifying and addressing these issues is crucial for restoring the cruise control's proper operation, and while some DIY enthusiasts may attempt repairs, consulting a qualified mechanic is often recommended for accurate diagnosis and effective solutions.

How urgent is it to address the non-functioning cruise control in my 2018 Audi TT RS Quattro?

When your 2018 Audi TT RS Quattro's cruise control fails, it’s crucial to recognize the urgency of the situation. While it may seem like a minor inconvenience, a malfunctioning cruise control can lead to significant safety risks, especially during long drives where driver fatigue is a concern. This feature not only enhances comfort by maintaining a steady speed but also contributes to better fuel efficiency. Ignoring the problem could indicate deeper issues within the vehicle's electronic systems or sensors, which may escalate if left unaddressed. Moreover, delaying repairs can result in further damage, leading to more costly fixes down the line. Therefore, it is advisable to investigate and resolve any cruise control issues promptly to ensure your safety and the optimal performance of your Audi.

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