2009 Mercedes-Benz GL450 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2009 Mercedes-Benz GL450 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2009 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 2009 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 non-functioning cruise control in a 2009 Mercedes-Benz GL450?

When diagnosing the non-functioning cruise control in a 2009 Mercedes-Benz GL450, it's crucial to follow a methodical approach that begins with the simplest checks before moving on to more complex diagnostics. Start by inspecting the fuse related to the cruise control system, as a blown fuse is often the most straightforward issue to resolve. Next, examine the cruise control switch located on the steering wheel to ensure it is functioning properly and not stuck, as this can directly impact the system's operation. After that, check the brake pedal switch, which is essential for disengaging the cruise control when the brakes are applied; a malfunctioning switch can prevent the system from engaging altogether. Additionally, assess the vehicle speed sensor to verify that it is sending accurate signals to the cruise control module, as incorrect readings can disrupt functionality. Using a diagnostic scanner to check for any error codes can also provide valuable insights into potential issues that may not be immediately apparent. Finally, inspect the cruise control module for any signs of damage or malfunction. If these steps do not lead to a resolution, seeking assistance from a qualified mechanic may be necessary to ensure a comprehensive diagnosis and repair. By adhering to this structured diagnostic approach, you can effectively troubleshoot and resolve issues with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2009 Mercedes-Benz GL450?

When troubleshooting the cruise control system in a 2009 Mercedes-Benz GL450, it's essential to understand the common problems that may lead to its malfunction. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since it is designed to deactivate when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to erratic behavior or complete failure. Another potential issue is vacuum leaks within the engine, which can hinder the cruise control's performance by affecting its speed consistency. Furthermore, a defective cruise control module may also be responsible for the system's inability to function correctly. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the operation of the cruise control system. By identifying and addressing these common problems, you can effectively troubleshoot and potentially restore the functionality of the cruise control in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2009 Mercedes-Benz GL450?

When it comes to the non-functioning cruise control in a 2009 Mercedes-Benz GL450, understanding the urgency of the situation is crucial for any DIY enthusiast. While it may not seem like an immediate emergency, neglecting this issue can lead to significant safety risks and potential damage to the vehicle's systems. Cruise control is designed to enhance driving comfort and efficiency, particularly on long journeys, and its malfunction could indicate deeper problems within the vehicle's electronic or mechanical systems. By addressing the issue promptly, you not only ensure a safer driving experience but also prevent further complications that could arise from ignoring the symptoms. For those inclined to tackle the repair themselves, it is essential to conduct a thorough inspection of the cruise control system, checking for common issues such as faulty switches, blown fuses, or issues with the throttle control. Taking these steps can help maintain the vehicle's performance and safety, making it a worthwhile endeavor for any DIY mechanic.

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