Mercedes-Benz G55 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz G55 AMG and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz G55 AMG

When troubleshooting cruise control issues in a Mercedes-Benz G55 AMG, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest potential problems, such as a blown fuse, which can often be the quickest fix. Next, inspect the control module, sensors, and switches, as these components frequently contribute to cruise control malfunctions. If these elements appear functional, move on to evaluating the throttle actuation system, as any irregularities here can disrupt cruise control performance. Additionally, examine the ABS wheel speed sensors, since a defect in any of these can lead to system failure. Don't overlook the spiral cable in the steering wheel, as a malfunction here can prevent the cruise control from engaging altogether. Finally, assess the vehicle's electrical connections for any signs of wear or damage, as these can also impede the cruise control system's operation. By following this structured approach, you can effectively identify and resolve the underlying issues affecting your cruise control system.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz G55 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz G55 AMG, it's essential to understand the common problems that may arise. One of the primary culprits is defective cruise control components, which can often be diagnosed using a diagnostic scanner to retrieve fault codes. Additionally, a faulty cruise control switch or module can hinder functionality, necessitating testing and potential replacement. Another frequent issue is a defective brake pedal switch, which can disrupt the cruise control system's operation. It's also important to consider the battery's health; a dead battery can lead to various electrical issues, including cruise control failure. Furthermore, a malfunctioning ABS wheel speed sensor can trigger cruise control problems, often accompanied by warning lights for the ESP and ABS systems. In some cases, intermittent cruise control functionality may indicate underlying electronic or mechanical issues. Lastly, engine or transmission problems can also affect cruise control performance, causing it to disengage unexpectedly. By conducting thorough diagnostics and inspections, DIY enthusiasts can effectively identify and resolve these issues, ensuring a smooth driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz G55 AMG?

When the cruise control in your Mercedes-Benz G55 AMG is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and potentially more significant mechanical problems. Common culprits include a defective brake pedal switch, which can prevent the system from engaging, or issues with the ABS wheel speed sensor and battery. Additionally, a blown fuse or problems within the throttle control system may also contribute to the malfunction. In older models, a broken vacuum line could be the source of the issue. Ignoring these symptoms not only compromises your driving experience but could also lead to more extensive repairs down the line. Therefore, it is advisable to conduct a thorough check of these components or consult a professional service team to diagnose and resolve the problem effectively, ensuring your vehicle remains safe and reliable on the road.

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