2002 Mercedes-Benz ML55 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2002 Mercedes-Benz ML55 AMG

Find Repair Location
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 2002 Mercedes-Benz ML55 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 2002 Mercedes-Benz ML55 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 2002 Mercedes-Benz ML55 AMG?

When troubleshooting the non-functional cruise control in a 2002 Mercedes-Benz ML55 AMG, it's important to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can often be the simplest fix. Next, inspect the cruise control switch located on the steering wheel for any signs of damage or malfunction, as this component is crucial for activating the system. Ensure that your brake lights are functioning properly, since a faulty brake light switch can inadvertently disable the cruise control. Additionally, examine the vehicle's speed sensors, which are vital for the cruise control's operation; any malfunction here can lead to issues. It’s also wise to scan the onboard computer system for error codes that may provide insight into the problem. Finally, inspect the vacuum lines connected to the cruise control actuator for any leaks or damage, as these can significantly impact performance. By following these steps, you can effectively diagnose and address the issues affecting your cruise control system, making your DIY repair efforts more successful.

What are the common problems that could cause the cruise control to stop working in a 2002 Mercedes-Benz ML55 AMG?

When troubleshooting the cruise control system in a 2002 Mercedes-Benz ML55 AMG, it's essential to consider several common problems that could be causing the malfunction. One of the primary issues is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to detect when the brake pedal is pressed. Additionally, problems with the speed sensor can disrupt the system's ability to maintain speed, as it relies on accurate readings to function correctly. Another potential culprit is vacuum leaks within the cruise control system, which can interfere with its operation. A defective cruise control module may also be responsible for the failure, as it is a critical component of the system. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the functionality of the cruise control. By systematically checking these areas, DIY enthusiasts can effectively diagnose and resolve issues with the cruise control in their vehicle.

How urgent is it to repair the non-functioning cruise control on a 2002 Mercedes-Benz ML55 AMG?

Repairing the non-functioning cruise control on a 2002 Mercedes-Benz ML55 AMG should be prioritized due to its significant impact on safety and driving comfort. A malfunctioning cruise control system can lead to increased driver fatigue, as maintaining a consistent speed becomes a manual task, particularly on long trips. This added strain can distract the driver, heightening the risk of accidents. Furthermore, the cruise control system is not just a convenience; it can also serve as an indicator of broader vehicle health. Ignoring this issue may mask underlying problems that could escalate into more severe mechanical failures, ultimately affecting the vehicle's performance and reliability. Therefore, while it may not seem like an immediate emergency, addressing the cruise control malfunction promptly is essential for ensuring a safe and enjoyable driving experience.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.