2010 Mercedes-Benz ML550 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2010 Mercedes-Benz ML550

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Reviewed by
Aisha
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 2010 Mercedes-Benz ML550 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 2010 Mercedes-Benz ML550 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 steps to diagnose the cruise control issue in a 2010 Mercedes-Benz ML550?

When diagnosing a cruise control issue in a 2010 Mercedes-Benz ML550, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, assess the functionality of the cruise control buttons on the steering wheel, since malfunctioning buttons can lead to operational issues. Utilizing a diagnostic scanner to retrieve error codes from the vehicle's onboard computer can provide critical insights into any specific problems affecting the cruise control system. Additionally, ensure that the speed sensors are working correctly, as they are vital for the cruise control's performance. It's also advisable to examine the wiring and connections related to the cruise control system for any signs of damage or corrosion, which can hinder functionality. Finally, testing the cruise control module will help determine if it is operating as intended. By adhering to this structured diagnostic process, you can effectively pinpoint and resolve the underlying issues with the cruise control system in your ML550.

What are the common problems that could cause the cruise control to stop working in a 2010 Mercedes-Benz ML550?

When the cruise control in your 2010 Mercedes-Benz ML550 ceases to function, it can be frustrating, but understanding the common problems can guide you in diagnosing the issue. One frequent culprit is a faulty brake light switch, which may fail to signal that the brake pedal is engaged, thereby preventing the cruise control from activating. Additionally, issues with the speed sensor can disrupt the system, as it relies on accurate speed data to maintain control. Another potential problem is vacuum leaks within the cruise control system, which can interfere with its operation. If these components are functioning correctly, consider the cruise control module itself, as a defect here can lead to complete system failure. Lastly, don’t overlook electrical problems, such as blown fuses or damaged wiring, which can also impede the cruise control's performance. By systematically checking these areas, you can identify and resolve the issue, restoring your vehicle's cruise control functionality.

How urgent is it to address the non-functioning cruise control in a 2010 Mercedes-Benz ML550?

When it comes to a non-functioning cruise control in a 2010 Mercedes-Benz ML550, the urgency of addressing the issue cannot be overstated. While it may seem like a minor inconvenience, a malfunctioning cruise control system can indicate deeper problems within the vehicle's electronics or engine control systems. Ignoring this symptom could lead to more significant issues down the line, potentially affecting the vehicle's overall performance and safety. For DIY enthusiasts, it's crucial to recognize that timely intervention not only enhances driving comfort by reducing fatigue on long trips but also helps maintain fuel efficiency. Therefore, if you notice any irregularities with your cruise control, it is advisable to conduct a thorough inspection or consult a qualified mechanic. This proactive approach can prevent further complications and ensure that your vehicle remains safe and reliable on the road.

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