2008 Mercedes-Benz G55 AMG Cruise Control Isn't Working

Diagnosing Cruise Control Issues in Your 2008 Mercedes-Benz G55 AMG and How to Restore Functionality

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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 2008 Mercedes-Benz G55 AMG 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 2008 Mercedes-Benz G55 AMG 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 cruise control issue in a 2008 Mercedes-Benz G55 AMG?

To effectively diagnose a cruise control issue in a 2008 Mercedes-Benz G55 AMG, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box; a blown fuse can often be the simplest explanation for malfunction. Next, examine the cruise control buttons on the steering wheel to ensure they are operational and not stuck, as this can directly impact functionality. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying electronic issues that may be affecting the system. Additionally, inspect the speed sensors, as they are critical for the cruise control to function correctly. It’s also important to test the brake pedal switch, which should send the appropriate signals to disengage the cruise control when the brakes are applied. Lastly, take a close look at the wiring connections associated with the cruise control system for any signs of damage or loose connections. If these steps do not resolve the issue, seeking assistance from a professional mechanic or an authorized Mercedes-Benz service center is recommended for a thorough diagnosis and repair. This methodical approach not only helps in identifying the problem efficiently but also ensures that you cover all potential causes systematically.

What are the common problems that could cause the cruise control to stop working in a 2008 Mercedes-Benz G55 AMG?

When dealing with cruise control issues in a 2008 Mercedes-Benz G55 AMG, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging as it is designed to disengage when the brakes are applied. Additionally, a malfunctioning speed sensor can disrupt the system's ability to maintain a constant speed, leading to cruise control failure. It's also wise to check for a blown fuse in the cruise control circuit, as this can easily interrupt functionality. Another potential issue lies with the throttle actuator; if it is not operating correctly, it can hinder the cruise control's performance. Lastly, if all other components appear to be functioning, the cruise control module itself may be faulty and require inspection or replacement. By systematically addressing these issues, DIYers can effectively troubleshoot and potentially restore the cruise control system in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz G55 AMG?

When it comes to the non-functioning cruise control in a 2008 Mercedes-Benz G55 AMG, the urgency of addressing this issue cannot be overstated. While it may seem like a minor inconvenience, neglecting the problem can lead to more significant safety risks and potential damage to the vehicle's electronic systems. Cruise control is designed to enhance driving comfort and efficiency, particularly during long trips, and its failure may indicate deeper issues within the car's electronic framework. This could affect not only the cruise control but also other critical systems, leading to a cascading effect on overall vehicle performance. For DIY enthusiasts, it’s essential to recognize that while troubleshooting and repairs can be attempted at home, consulting a qualified mechanic or dealership is advisable to ensure that any underlying problems are accurately diagnosed and resolved. By addressing the cruise control malfunction promptly, you can maintain the safety and reliability of your G55 AMG, ensuring a smoother and more enjoyable driving experience.

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