2011 Mercedes-Benz ML450 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2011 Mercedes-Benz ML450 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 2011 Mercedes-Benz ML450 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 2011 Mercedes-Benz ML450 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 non-functioning cruise control in a 2011 Mercedes-Benz ML450?

To effectively diagnose the non-functioning cruise control in your 2011 Mercedes-Benz ML450, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the vehicle's fuse box, as a blown fuse can often be the simplest explanation for the issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational and not stuck or damaged, as this can directly affect functionality. Following this, check the speed sensors, which are crucial for the cruise control system to function correctly; any malfunction here can lead to a failure in cruise control engagement. Utilizing a diagnostic scanner to scan for error codes can provide insights into any underlying issues reported by the vehicle's onboard computer. Additionally, verify that the brake and clutch switches are functioning properly, as these components are designed to disengage cruise control when either pedal is pressed. Inspecting the wiring and connections for any signs of damage or corrosion is also essential, as these can disrupt the system's operation. Finally, test the cruise control module to ensure it is sending and receiving signals correctly, as a faulty module can be the root cause of the malfunction. By following this structured diagnostic approach, you can efficiently identify and address the issue with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2011 Mercedes-Benz ML450?

When the cruise control in a 2011 Mercedes-Benz ML450 ceases to function, several common issues may be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since the system is designed to disengage when the brake pedal is pressed. Additionally, problems with the speed sensor can hinder the vehicle's ability to maintain a constant speed, leading to cruise control failure. Another potential issue is a malfunctioning throttle actuator, which is responsible for controlling engine speed based on cruise control inputs; if it fails, the system cannot operate correctly. Electrical problems, such as blown fuses or wiring issues, can also disrupt cruise control functionality, making it essential to check all electrical connections. Furthermore, a faulty control module can impede the cruise control system's performance, as it relies on this component to function properly. Lastly, vacuum leaks within the engine system can affect cruise control operation, so inspecting for and repairing any leaks is crucial. By understanding these common problems, DIYers can effectively troubleshoot and potentially resolve cruise control issues in their ML450, restoring this convenient feature.

How urgent is it to address the non-functioning cruise control in a 2011 Mercedes-Benz ML450?

When it comes to the non-functioning cruise control in a 2011 Mercedes-Benz ML450, understanding the urgency of the situation is crucial for any DIY enthusiast. While the immediate safety risks may not be as severe as those associated with malfunctioning brakes or steering, neglecting the cruise control issue can lead to a range of inconveniences and potential complications. For instance, the absence of cruise control can significantly increase driver fatigue during long trips, making it harder to maintain focus on the road. Moreover, unresolved cruise control problems might signal deeper issues within the vehicle's electronic systems, which could escalate into more serious and costly repairs if left unchecked. Therefore, it is advisable to address the non-functioning cruise control promptly, not only to restore the convenience and efficiency it offers but also to ensure the overall performance and reliability of your vehicle. Taking action sooner rather than later can save you from future headaches and enhance your driving experience.

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2011 Mercedes-Benz ML450 Cruise Control Issues & Repairs