2007 Mercedes-Benz GL320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2007 Mercedes-Benz GL320 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 2007 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 2007 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 2007 Mercedes-Benz GL320?

To effectively diagnose the non-functioning cruise control in your 2007 Mercedes-Benz GL320, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse is a common and easily fixable issue that can halt the system's operation. Next, examine the cruise control buttons on the steering wheel to ensure they are responsive; faulty buttons can prevent engagement. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide insights into specific malfunctions. Following this, assess the speed sensors, as they are integral to the cruise control's functionality; any faults here can lead to system failure. Additionally, verify that the brake and clutch switches are functioning correctly, since defective switches can inhibit cruise control activation. Finally, conduct a thorough inspection of the wiring and connections associated with the cruise control system, looking for signs of damage or corrosion that could disrupt its operation. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2007 Mercedes-Benz GL320?

When the cruise control in your 2007 Mercedes-Benz GL320 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 may fail to signal the cruise control system when the brake pedal is pressed, thereby preventing engagement. 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 problem is vacuum leaks within the engine, which can interfere with the cruise control's operation, causing it to disengage unexpectedly. Furthermore, a defective cruise control module can also be responsible for the malfunction, as it is the central component that controls the system. Lastly, electrical problems, such as blown fuses or damaged wiring, can hinder the cruise control's functionality. 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 2007 Mercedes-Benz GL320?

Addressing a non-functioning cruise control in your 2007 Mercedes-Benz GL320 is crucial for both safety and vehicle performance. While it may seem like a minor inconvenience, a malfunctioning cruise control system can signal deeper electronic or sensor issues that could affect other critical systems in your vehicle. Ignoring this problem not only compromises the convenience of maintaining a steady speed during long drives, which can lead to increased driver fatigue, but it may also result in higher fuel consumption as the vehicle struggles to maintain efficiency without this feature. Moreover, the absence of cruise control can pose safety risks, particularly on extended trips where consistent speed is essential. Therefore, it is advisable to have the cruise control system inspected and repaired promptly by a qualified mechanic to prevent further complications and ensure your vehicle remains safe and reliable on the road.

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