2009 Mercedes-Benz G550 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2009 Mercedes-Benz G550

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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 G550 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 G550 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 steps should I take to diagnose the non-functioning cruise control in my 2009 Mercedes-Benz G550?

To effectively diagnose the non-functioning cruise control in your 2009 Mercedes-Benz G550, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse in the fuse box, 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 and not malfunctioning, as faulty buttons can prevent engagement. Following this, verify the speed sensor's functionality, since a defective sensor can disrupt the cruise control's ability to maintain speed. It's also essential to check the brake pedal switch, as a stuck or faulty switch can disable the cruise control entirely. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes that may indicate specific problems within the system. Additionally, inspect the wiring and connections for any signs of damage or corrosion, as compromised wiring can lead to malfunctions. If you still cannot determine the cause of the issue, consulting a qualified mechanic or dealership is advisable, as they possess the expertise and tools necessary for diagnosing more complex problems. By following this structured diagnostic approach, you can efficiently identify and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2009 Mercedes-Benz G550?

When the cruise control in your 2009 Mercedes-Benz G550 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 that the brakes are not engaged, thus preventing the cruise control from activating. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to operational failures. It's also essential to check for vacuum leaks, as these can interfere with the cruise control's performance. A defective cruise control module may be another reason for the malfunction, as it is responsible for controlling the system's functions. Lastly, don't overlook potential electrical problems, such as blown fuses or wiring issues, which can significantly impact the cruise control's operation. By systematically addressing these areas, you can troubleshoot and resolve the cruise control issues in your G550, restoring its functionality and enhancing your driving experience.

How urgent is it to address the non-functioning cruise control in a 2009 Mercedes-Benz G550?

When it comes to the non-functioning cruise control in a 2009 Mercedes-Benz G550, understanding the urgency of the situation is crucial for any DIY enthusiast. While the immediate safety risks may not be as pronounced as those associated with critical systems like brakes or steering, neglecting this issue can lead to more significant problems down the line. A malfunctioning cruise control system may signal underlying electronic or sensor issues that could affect other vehicle functions, potentially leading to costly repairs. Moreover, the convenience of cruise control is particularly valuable during long drives, where its absence can lead to increased driver fatigue and discomfort. By addressing the problem promptly, you not only enhance your driving experience but also safeguard against further damage to your vehicle, ultimately saving on repair costs. Therefore, while it may not be the most urgent repair, it is wise to consult a qualified mechanic to ensure your G550 remains in optimal condition.

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2009 Mercedes-Benz G550 Cruise Control Issues & Solutions