1997 Audi Cabriolet Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 1997 Audi Cabriolet 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 1997 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 1997 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 1997 Audi Cabriolet?

When troubleshooting the non-functional cruise control in a 1997 Audi Cabriolet, it's essential to adopt a systematic diagnostic approach. Start by checking the fuse box for any blown fuses related to the cruise control system, as this is a simple fix that can often resolve the issue. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a malfunctioning switch can prevent the system from engaging. Following this, examine the cruise control module for any signs of damage or malfunction, as this component is crucial for the system's functionality. Additionally, inspect the vacuum lines connected to the cruise control system for leaks or damage, as these can significantly impact performance. Finally, test the brake pedal switch to ensure it is functioning correctly, as a faulty switch can interfere with the cruise control operation. By methodically working through these steps, you can effectively diagnose and potentially resolve the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1997 Audi Cabriolet?

When troubleshooting the cruise control system in a 1997 Audi Cabriolet, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty cruise control switch, which can hinder the system's ability to engage or disengage properly. Additionally, a defective cruise control module can disrupt communication between the switch and the engine, further complicating the issue. Vacuum leaks are another significant factor, as they can prevent the cruise control from maintaining speed effectively. Moreover, a malfunctioning speed sensor may fail to provide accurate speed readings, causing the system to malfunction. Lastly, electrical issues, such as blown fuses or wiring problems, can interrupt the operation of the cruise control system. By identifying and addressing these potential issues, DIY enthusiasts can effectively troubleshoot and restore functionality to the cruise control in their Audi Cabriolet.

How urgent is it to repair the non-functioning cruise control in a 1997 Audi Cabriolet?

When evaluating the urgency of repairing the non-functioning cruise control in your 1997 Audi Cabriolet, it's essential to recognize the potential safety risks associated with its malfunction. A properly functioning cruise control system is crucial for maintaining a steady speed, particularly during long drives, which can help prevent sudden acceleration or deceleration that may lead to accidents. Additionally, the absence of cruise control can significantly detract from driving comfort, making long trips more tiring as the driver must constantly monitor and adjust their speed manually. Furthermore, neglecting this repair could impact the vehicle's resale value; prospective buyers often look for well-maintained features, and a malfunctioning cruise control system may raise concerns about the overall condition of the car. Therefore, while it may not be an immediate emergency, addressing the cruise control issue promptly is advisable to ensure safety, enhance driving comfort, and preserve the vehicle's value.

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