Audi Cabriolet Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Audi Cabriolet 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Audi Cabriolet 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 Audi Cabriolet 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 throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

Troubleshooting Cruise Control Issues in an Audi Cabriolet

When troubleshooting cruise control issues in your Audi Cabriolet, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse and brake pedal switch, as these are common culprits for cruise control failures. A blown fuse or a malfunctioning brake pedal switch can easily disrupt the system, so ensure these components are in good working order. Next, inspect the throttle control system for any irregularities, as issues here can also hinder cruise control functionality. Additionally, examine the ABS system, since problems within this system can impact cruise control operations. Don't overlook the brake lights; if any are faulty, they can interfere with the cruise control unit's performance. Finally, assess the control module for any signs of damage or malfunction. By following this methodical approach, you can effectively identify and resolve the underlying issues affecting your Audi Cabriolet's cruise control system.

What Are the Common Problems Causing Cruise Control Issues in an Audi Cabriolet?

When dealing with cruise control issues in your Audi Cabriolet, it's important to understand the common problems that may be at play. One of the simplest culprits could be a blown fuse, which can easily be checked and replaced if necessary. If the fuse is intact, you might want to inspect the switches and sensors, as defects in these components can disrupt the cruise control's functionality. Additionally, electrical problems such as faulty connections or a malfunctioning control module can complicate matters, requiring a more in-depth investigation. Mechanical issues should also be considered; for instance, split rubber actuator diaphragms, broken vacuum hoses, or malfunctioning clutch or brake switches can all lead to cruise control failures. By systematically checking these areas, you can identify and address the root cause of the malfunction, ensuring your cruise control system operates safely and effectively.

Why is the Cruise Control Not Working in an Audi Cabriolet?

When the cruise control in your Audi Cabriolet is not functioning, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and potentially more significant mechanical problems. Common culprits include a blown fuse, which can easily be checked and replaced, or a defective brake pedal switch that may prevent the system from engaging. Additionally, issues with the throttle control system or the ABS can disrupt cruise control functionality, making it essential to inspect these components. In older models, a broken vacuum line might be the culprit, while newer systems could suffer from electrical connection issues or a faulty control module. Symptoms like a malfunctioning clutch switch or corroded contacts in the stalk switch should not be overlooked, as they can also contribute to the problem. By addressing these issues quickly, you not only enhance your driving experience but also ensure your safety on the road.

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