2005 Mercedes-Benz SL65 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Mercedes-Benz SL65 AMG 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 2005 Mercedes-Benz SL65 AMG 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 2005 Mercedes-Benz SL65 AMG 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2005 Mercedes-Benz SL65 AMG?

When troubleshooting the non-functional cruise control in a 2005 Mercedes-Benz SL65 AMG, start with the simplest checks to avoid unnecessary complexity. Begin by inspecting the fuses related to the cruise control system, as a blown fuse can often be the culprit. Next, assess the brake pedal and throttle body, since issues with these components can directly impact cruise control functionality. It's also essential to check the brake pedal switch, as a malfunctioning switch is a common reason for cruise control failure. If these initial checks do not resolve the issue, look for any defective sensors that may be affecting the system. Lastly, be aware that any problems with the brake system itself can inadvertently cause the cruise control to disengage, so ensure everything is functioning correctly. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz SL65 AMG?

When the cruise control in your 2005 Mercedes-Benz SL65 AMG ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty brake light switch, which may fail to signal that the brakes are not engaged, thus preventing the cruise control from activating. Additionally, issues with the speed sensor can lead to incorrect speed readings, causing the system to disengage unexpectedly. Another potential problem is vacuum leaks within the cruise control system, which can disrupt its ability to maintain a steady speed. Furthermore, a defective cruise control module may hinder the system's responsiveness to your commands, while electrical problems, such as blown fuses or wiring issues, can also contribute to the malfunction. By identifying these common issues, you can take the first steps toward troubleshooting and restoring the functionality of your cruise control system.

How urgent is it to repair the non-functioning cruise control in a 2005 Mercedes-Benz SL65 AMG?

Repairing the non-functioning cruise control in a 2005 Mercedes-Benz SL65 AMG is not just a matter of convenience; it is a critical safety concern that should be addressed without delay. A malfunctioning cruise control system can lead to erratic speed control, increasing the risk of accidents, especially during long highway drives where maintaining a steady speed is essential. Additionally, neglecting this issue may indicate deeper mechanical problems that could compromise the vehicle's overall performance and reliability. By prioritizing the repair of your cruise control, you not only enhance your driving comfort but also ensure that your vehicle operates safely and efficiently, preventing potential hazards on the road. Therefore, it is advisable to take action as soon as you notice any signs of malfunction to safeguard both your driving experience and your vehicle's integrity.

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2005 Mercedes-Benz SL65 AMG Cruise Control Issues Explained