Mercedes-Benz ML55 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz ML55 AMG and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz ML55 AMG

When troubleshooting cruise control issues in your Mercedes-Benz ML55 AMG, it's crucial to follow a structured diagnostic approach to efficiently identify the root cause. Begin by examining the cruise control switch, which is easily accessible at the end of the stalk under the steering column cover. If this switch is functioning properly, the next step is to inspect the brake light switch, as failures in this component are frequently responsible for cruise control malfunctions. After confirming these simpler fixes, turn your attention to the throttle system and associated sensors, as any irregularities here can significantly affect cruise control performance. If the problem persists, the control module may be at fault, and you might need professional diagnostics to assess its condition. Pay close attention to any warning messages on the instrument cluster, as they can offer critical clues about the underlying issues. Additionally, if the ETS and ABS lights are illuminated, this could indicate a more complex problem that warrants further investigation. By methodically checking these components, you can effectively troubleshoot and resolve cruise control issues in your ML55 AMG.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz ML55 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz ML55 AMG, it's essential to understand the common problems that may arise. One of the primary culprits is defective cruise control components, which can include the cruise control switch and module. A thorough visual inspection and functionality test of these components can help identify any faults that may require replacement. Additionally, the brake pedal switch is a frequent source of issues; if it is malfunctioning, it can prevent the cruise control from engaging properly. Another factor to consider is the vehicle's battery; a dead or weak battery can disrupt the cruise control system's operation. Furthermore, a faulty ABS wheel speed sensor can trigger warning lights and lead to cruise control problems, as it plays a crucial role in the system's functionality. Intermittent issues may also arise from underlying electrical or mechanical problems, necessitating a detailed troubleshooting approach. Lastly, checking the fuses and relays associated with the cruise control system is vital, as any faults here can lead to malfunctions. By systematically addressing these common problems, you can effectively troubleshoot and resolve cruise control issues, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz ML55 AMG?

When the cruise control in your Mercedes-Benz ML55 AMG fails to operate, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. Common culprits include a malfunctioning cruise control module, which may require replacement, or issues with the brake pedal switch that can prevent the system from engaging. Additionally, problems with the throttle actuation system or a defective ABS wheel speed sensor can disrupt cruise control functionality, potentially triggering warning lights on your dashboard. If you notice that the cruise control does not engage and displays dashes instead of the set speed, this indicates a specific malfunction that should not be ignored. Furthermore, a blown fuse or a faulty brake light can also contribute to the problem. Given the potential for these issues to affect your driving experience and safety, it is advisable to conduct a thorough inspection or consult a professional service team to diagnose and resolve the underlying causes effectively. Taking action now can help prevent more significant damage and ensure your vehicle operates safely and efficiently.

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