2009 Mercedes-Benz GL320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2009 Mercedes-Benz GL320 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2009 Mercedes-Benz GL320 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 GL320 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 GL320?

To effectively diagnose the non-functioning cruise control in your 2009 Mercedes-Benz GL320, begin with the simplest checks to save time and effort. Start by inspecting the cruise control fuse in the fuse box; a blown fuse is often the culprit behind electrical issues. Next, examine the cruise control buttons on the steering wheel to ensure they are not stuck or damaged, as this can prevent engagement. Following this, check the speed sensors, which are vital for the cruise control system's operation, to confirm they are functioning correctly. Utilizing a diagnostic scanner can help you identify any error codes that may indicate specific problems within the cruise control system. Additionally, inspect the brake and clutch switches, as faulty switches can inhibit cruise control activation. If these initial checks do not resolve the issue, proceed to test the cruise control module to ensure it is communicating properly. Lastly, examine the wiring and connections for any signs of damage or corrosion that could disrupt the system. If you still cannot pinpoint the problem, it may be wise to consult a professional mechanic or an authorized Mercedes-Benz service center for expert assistance. By following this structured approach, you can systematically diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2009 Mercedes-Benz GL320?

When dealing with cruise control issues in a 2009 Mercedes-Benz GL320, it's essential to understand the common problems that may 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, speed sensor issues can disrupt the cruise control's functionality, as accurate speed readings are crucial for the system's operation. Another potential problem is vacuum leaks within the cruise control system, which can significantly impair its performance. Furthermore, a defective cruise control module may also be responsible for the malfunction, as it plays a vital role in the system's overall operation. Lastly, electrical problems, including faulty wiring or blown fuses, can lead to the cruise control failing to work as intended. By identifying and addressing these common issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

How urgent is it to address the malfunctioning cruise control in a 2009 Mercedes-Benz GL320?

Addressing a malfunctioning cruise control in a 2009 Mercedes-Benz GL320 is of utmost importance due to the immediate safety risks it poses. A faulty system can lead to unexpected changes in speed, which can jeopardize the safety of the driver, passengers, and others on the road. Additionally, the comfort that cruise control provides is compromised, making long drives less enjoyable and more stressful. Ignoring these symptoms can also result in more severe issues, potentially damaging other vehicle components and leading to costly repairs down the line. Therefore, it is crucial to prioritize the repair of the cruise control system to ensure a safe and comfortable driving experience while preventing further complications.

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