2014 Mercedes-Benz ML350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2014 Mercedes-Benz ML350 and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2014 Mercedes-Benz ML350 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 2014 Mercedes-Benz ML350 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 2014 Mercedes-Benz ML350?

To diagnose the non-functioning cruise control in a 2014 Mercedes-Benz ML350, start with the simplest checks to avoid unnecessary complexity. Begin by inspecting the cruise control fuse in the fuse box, as a blown fuse can easily disrupt the system. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, which could prevent proper operation. Following this, inspect the speed sensors on the wheels, as dirt or damage can interfere with the cruise control's functionality. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying issues within the vehicle's onboard computer. Additionally, ensure that the brake and clutch switches are functioning correctly, as faulty switches can inhibit cruise control engagement. It’s also important to inspect the wiring and connections related to the cruise control system for any loose or damaged components. Finally, test the cruise control module to confirm it is sending signals properly. If these steps do not resolve the issue, consulting a professional mechanic or an authorized Mercedes-Benz service center is recommended for further diagnosis and repair. By following this structured approach, you can effectively troubleshoot the cruise control system in your ML350.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz ML350?

When troubleshooting cruise control issues in a 2014 Mercedes-Benz ML350, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the system from engaging if it fails to detect when the brake pedal is pressed. Additionally, a malfunctioning speed sensor can disrupt the cruise control's ability to maintain a steady speed, causing it to disengage unexpectedly. Another potential issue is a blown fuse within the cruise control system, which can halt its operation entirely and is often a straightforward fix. Furthermore, problems with the throttle actuator, whether due to wear or electrical faults, can hinder the system's capacity to regulate speed effectively. Lastly, a defective cruise control module may also be responsible for the malfunction, necessitating either repair or replacement. By identifying and addressing these common issues, you can effectively troubleshoot and restore the cruise control functionality in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2014 Mercedes-Benz ML350?

When it comes to a non-functioning cruise control in a 2014 Mercedes-Benz ML350, the urgency of addressing the problem cannot be overstated. While it may not seem like an immediate emergency, neglecting this issue can lead to significant safety risks, especially during long drives where cruise control is typically utilized to maintain speed and reduce driver fatigue. A malfunctioning system may also signal deeper electronic or sensor-related problems that could affect other critical vehicle functions. For DIY enthusiasts, it’s essential to recognize that timely intervention not only enhances the driving experience but also prevents potential complications that could arise from ignoring the symptoms. Therefore, if you notice any irregularities with your cruise control, it’s advisable to investigate the issue promptly, whether through self-diagnosis or by consulting a qualified mechanic, to ensure both your safety and the optimal performance of your vehicle.

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