2014 Mercedes-Benz GL450 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2014 Mercedes-Benz GL450

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2014 Mercedes-Benz GL450 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 GL450 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 2014 Mercedes-Benz GL450?

When diagnosing a cruise control issue in a 2014 Mercedes-Benz GL450, it's crucial to follow a structured diagnostic approach that prioritizes simpler checks before moving on to more complex solutions. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, examine the cruise control buttons on the steering wheel to ensure they are functioning correctly, since faulty buttons can prevent the system from engaging. Utilizing a diagnostic scanner to check for error codes can provide insights into any electronic issues within the vehicle's onboard computer. Additionally, verify the functionality of the speed sensors, which are essential for the cruise control system's performance; any malfunction here can lead to significant problems. It's also wise to inspect the wiring connections for signs of damage or corrosion, as poor connections can impede the system's functionality. Finally, test the cruise control module to ensure it is operating as intended. If these initial steps do not resolve the issue, consulting a professional mechanic or an authorized Mercedes-Benz service center is advisable for a comprehensive diagnosis and repair. This methodical approach not only aids in efficiently identifying the problem but also ensures that all potential causes are systematically addressed.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz GL450?

When troubleshooting the cruise control system in a 2014 Mercedes-Benz GL450, it's essential to consider several common problems that could 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, issues with the speed sensor can disrupt the cruise control's functionality, as it relies on accurate speed readings to operate correctly. Another potential issue is vacuum leaks within the cruise control system, which can significantly affect its performance. A defective cruise control module may also be responsible for the malfunction, as it plays a crucial role in the system's operation. Lastly, electrical problems, such as blown fuses or wiring issues, can hinder the cruise control's functionality. By systematically checking these areas, DIYers can effectively diagnose and resolve the cruise control issues in their GL450.

How urgent is it to address the malfunctioning cruise control in a 2014 Mercedes-Benz GL450?

Addressing a malfunctioning cruise control in a 2014 Mercedes-Benz GL450 is of utmost importance due to the potential safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, which can create hazardous driving conditions for both the driver and others on the road. Additionally, a faulty cruise control system detracts from the overall driving experience, making long trips less convenient and enjoyable. Ignoring these symptoms can lead to more significant issues within the vehicle's systems, resulting in costly repairs down the line. Therefore, it is crucial to prioritize the diagnosis and repair of cruise control problems to ensure not only your safety but also the longevity and performance of your vehicle.

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2014 Mercedes-Benz GL450 Cruise Control Issues & Solutions