2012 Mercedes-Benz GL350 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2012 Mercedes-Benz GL350

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 2012 Mercedes-Benz GL350 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 2012 Mercedes-Benz GL350 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 2012 Mercedes-Benz GL350?

When troubleshooting the non-functional cruise control in a 2012 Mercedes-Benz GL350, start with the simplest checks to avoid unnecessary complexity. Begin by inspecting the cruise control fuse; a blown fuse can easily disrupt the system's operation. Next, test the cruise control switch to ensure it is functioning correctly, as a faulty switch may require replacement. Following this, examine the speed sensors, as they play a crucial role in the cruise control's performance; any malfunction here can lead to issues. Additionally, inspect the wiring and connections for any signs of damage or corrosion, as these can impede the system's functionality. Utilizing a diagnostic scanner to check for error codes can provide insights into specific problems affecting the cruise control. Lastly, verify that the brake and clutch switches are operational, as these components are essential for the cruise control to engage properly. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2012 Mercedes-Benz GL350?

When the cruise control in your 2012 Mercedes-Benz GL350 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty brake light switch, which is crucial for the cruise control system as it disengages the system when the brake pedal is pressed. If this switch is malfunctioning, it may prevent the cruise control from engaging at all. Another potential issue is related to the speed sensor; if this component is not providing accurate speed readings, the cruise control will not operate correctly. Additionally, vacuum leaks within the cruise control system can disrupt its functionality, leading to unexpected disengagements. A defective cruise control module can also be a significant factor, as it controls the overall operation of the system. Lastly, electrical problems, such as blown fuses or damaged wiring, can hinder the cruise control's performance. By systematically checking these areas, you can identify and resolve the issues affecting your cruise control system, allowing for a smoother driving experience.

How urgent is it to address the non-functioning cruise control in a 2012 Mercedes-Benz GL350?

When it comes to a non-functioning cruise control in a 2012 Mercedes-Benz GL350, the urgency of addressing the issue cannot be overstated. While it may seem like a minor inconvenience, neglecting this problem can lead to more significant safety risks and potential damage to the vehicle's electronic systems. Cruise control is designed to enhance driving comfort and efficiency, particularly on long journeys, and its failure may indicate underlying issues that could affect other critical functions of the car. For DIY enthusiasts, it’s essential to recognize that while troubleshooting the cruise control system can be a rewarding challenge, it is crucial to approach the task with caution. A thorough inspection of the vehicle’s sensors and electronic components is necessary to identify the root cause of the malfunction. Ignoring the symptoms could not only compromise your driving experience but also lead to costly repairs down the line. Therefore, addressing the non-functioning cruise control promptly is advisable to ensure both the safety and optimal performance of your vehicle.

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.