2009 Mercedes-Benz ML63 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2009 Mercedes-Benz ML63 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 2009 Mercedes-Benz ML63 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 ML63 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-functional cruise control in a 2009 Mercedes-Benz ML63 AMG?

When troubleshooting the non-functional cruise control in a 2009 Mercedes-Benz ML63 AMG, it's crucial to follow a structured diagnostic approach to identify the issue effectively. Begin by inspecting the cruise control fuse in the fuse box, as a blown fuse is often a straightforward fix that can resolve the problem. Next, verify that the cruise control settings are correctly configured and activated, since incorrect settings can hinder the system's operation. Utilizing a diagnostic scanner to check for error codes can reveal any underlying issues within the vehicle's onboard computer, providing further direction for your troubleshooting efforts. Additionally, examine the cruise control buttons on the steering wheel for any visible damage or wear, as these components are essential for the system's functionality. Finally, while driving, attempt to engage the cruise control to assess its responsiveness and identify any operational issues. By systematically following these steps, you can effectively diagnose the cause of the cruise control malfunction and take the necessary actions to restore its functionality.

What are the common problems that could cause the cruise control to stop working in a 2009 Mercedes-Benz ML63 AMG?

When troubleshooting cruise control issues in a 2009 Mercedes-Benz ML63 AMG, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to signal when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain speed, as it relies on accurate readings to function correctly. Another potential issue is vacuum leaks, which can cause the cruise control to disengage unexpectedly, making it difficult to maintain a constant speed. Furthermore, a defective cruise control module may lead to a complete failure of the system to respond to commands. Lastly, electrical problems, such as blown fuses or wiring issues, can also hinder the operation of the cruise control system. By systematically addressing these common issues, DIY enthusiasts can effectively troubleshoot and resolve cruise control problems in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2009 Mercedes-Benz ML63 AMG?

When it comes to the non-functioning cruise control in a 2009 Mercedes-Benz ML63 AMG, addressing the issue should not be overlooked, even if it may not seem as urgent as other mechanical failures. While the absence of cruise control does not pose an immediate safety risk, it can significantly detract from the driving experience, especially during long journeys where maintaining a consistent speed is crucial for comfort and fuel efficiency. Ignoring this problem could lead to increased driver fatigue and frustration, particularly on highways where cruise control is most beneficial. Moreover, a malfunctioning cruise control system could indicate underlying electrical issues that, if left unaddressed, might escalate into more significant problems, potentially leading to costly repairs. Therefore, it is advisable to prioritize the repair of the cruise control system to ensure a smooth, enjoyable driving experience and to prevent any further complications that could arise from neglecting the issue.

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