Mercedes-Benz GL350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz GL350 and How to Fix Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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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 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz GL350

When troubleshooting cruise control issues in your Mercedes-Benz GL350, start by checking the basics to identify the root cause of the problem. Begin with the cruise control fuse; a blown fuse can easily disrupt the system's functionality. Next, inspect the brake pedal switch, as a defective switch can prevent the cruise control from engaging. If these components are functioning correctly, examine the throttle actuation and ensure that the throttle is responding as it should. Additionally, verify that the ABS wheel speed sensor and speed sensor are operational, as these are crucial for the cruise control system to maintain speed. If your cruise control only works intermittently, it may indicate an electronic issue, so consider checking the control module and any related sensors. By following this diagnostic approach, you can systematically eliminate potential issues and determine whether a simple fix will restore your cruise control functionality or if professional assistance is needed for more complex repairs.

What Are the Common Causes of Cruise Control Malfunction in a Mercedes-Benz GL350?

When experiencing cruise control malfunctions in a Mercedes-Benz GL350, it's essential to understand the common problems that may be at play. One of the primary issues often stems from a failed control module, sensor, or switch, which can disrupt the entire cruise control system. Additionally, malfunctioning speed sensors, whether located on the wheels or within the transmission, can prevent the cruise control from engaging properly. Another frequent culprit is a defective brake pedal switch, which can inadvertently signal that the brakes are applied, thus disabling the cruise control. Furthermore, problems with the throttle control system can also lead to operational failures. It's important to consider the ABS wheel speed sensor, as issues here can similarly affect cruise control functionality. Lastly, a faulty spiral cable within the steering wheel may hinder communication between the cruise control switch and the system itself. Identifying these potential issues is crucial for anyone looking to diagnose and repair their vehicle's cruise control system effectively.

Why is the Cruise Control Not Working in a Mercedes-Benz GL350?

When the cruise control in your Mercedes-Benz GL350 is not functioning, it is crucial to address the issue without delay. Ignoring symptoms such as the cruise control disengaging unexpectedly or the presence of warning lights on the dashboard can lead to more significant problems, including potential safety hazards while driving. A faulty ABS sensor, for instance, not only disables the cruise control but can also affect the vehicle's stability and braking systems, increasing the risk of accidents. Additionally, issues like a blown fuse or a malfunctioning brake pedal switch can prevent the cruise control from engaging, which may lead to erratic vehicle behavior. It is advisable to conduct a thorough diagnostic check to identify any underlying faults, as this proactive approach can save you from costly repairs and ensure your vehicle remains safe and reliable on the road. By addressing these concerns promptly, you can maintain the functionality of your cruise control and enhance your overall driving experience.

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