2009 Mercedes-Benz S65 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2009 Mercedes-Benz S65 AMG

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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 2009 Mercedes-Benz S65 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 2009 Mercedes-Benz S65 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2009 Mercedes-Benz S65 AMG?

When troubleshooting the non-functioning cruise control in a 2009 Mercedes-Benz S65 AMG, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's functionality. 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. It's also crucial to verify that the brake lights are functioning correctly, as a faulty brake light switch can inadvertently disable the cruise control. Additionally, examine the vehicle's speed sensors, which are vital for providing accurate data to the cruise control system; any issues here can lead to erratic behavior. Finally, consider scanning the vehicle's onboard computer for error codes related to the cruise control system, as this can help identify more complex issues that may require further investigation. By following these steps, you can effectively diagnose and potentially resolve the cruise control problem in your Mercedes-Benz S65 AMG.

What are the common problems that could cause the cruise control to stop working in a 2009 Mercedes-Benz S65 AMG?

When the cruise control in your 2009 Mercedes-Benz S65 AMG ceases to function, several common problems may be at play. One of the first areas to investigate is the cruise control system's components and sensors, as any defect here can disrupt its operation. Additionally, a blown fuse could be the culprit, so checking the vehicle's fuse box for any damaged fuses is a crucial step. Another frequent issue is a faulty brake pedal switch, which can inadvertently signal the cruise control to disengage. It's also important to examine the brake lights; if they are malfunctioning, it may indicate a problem with the brake pedal switch or wiring. Lastly, consider the possibility of other electrical issues within the cruise control system itself, as these can lead to intermittent or complete failure. By systematically checking these areas, you can effectively diagnose and potentially resolve the cruise control issue on your own.

How urgent is it to address the non-functioning cruise control in a 2009 Mercedes-Benz S65 AMG?

Addressing a non-functioning cruise control system in a 2009 Mercedes-Benz S65 AMG is crucial for both safety and vehicle performance. When cruise control fails, it not only diminishes driving comfort but may also signal deeper electronic or sensor issues that could compromise other critical systems. Ignoring this malfunction can lead to more severe problems, including costly repairs and potential safety hazards on the road. For instance, a malfunctioning cruise control could interfere with the vehicle's ability to maintain speed, increasing the risk of accidents, especially during long drives. Therefore, it is essential to diagnose and resolve the issue promptly to ensure the vehicle operates safely and efficiently, protecting both the driver and passengers from unnecessary risks. Taking immediate action can prevent further complications and enhance the overall driving experience.

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2009 Mercedes-Benz S65 AMG Cruise Control Fix Guide