Mercedes-Benz G65 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz G65 AMG and How to Fix Them

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Reviewed by
Andrew Hajjar
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 Mercedes-Benz G65 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 G65 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz G65 AMG

When faced with cruise control issues in your Mercedes-Benz G65 AMG, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components, such as the brake light switch, since a malfunction here can directly affect cruise control functionality. Ensure that your brake lights are operational, as any failure can signal to the system that the brakes are engaged, preventing cruise control from activating. Next, inspect the instrument cluster for any warning messages that may indicate underlying electrical issues. If the cruise control is still unresponsive, examine the spiral cable in the steering wheel, as damage here can disrupt communication with the cruise control system. Additionally, verify the condition of fuses and connectors related to the cruise control system, as faulty components can lead to intermittent operation or complete failure. If these steps do not resolve the issue, consider consulting a professional for a more thorough diagnosis, especially if the check engine light is illuminated, as this may point to more complex engine-related problems affecting the cruise control system. By following this structured approach, you can effectively identify and address the root causes of cruise control malfunctions in your vehicle.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz G65 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz G65 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 identified through a visual inspection and functionality tests of the cruise control switch and module. If these components are found to be faulty, replacing them is necessary to restore proper operation. Another frequent issue is a defective brake pedal switch; if this switch is malfunctioning, it can prevent the cruise control from engaging correctly. Additionally, a faulty ABS wheel speed sensor can trigger warning lights and disrupt cruise control functionality, making it crucial to check this sensor as part of your troubleshooting process.

Intermittent cruise control operation may indicate underlying electrical or mechanical issues, which can be diagnosed using a diagnostic scanner to check for damaged wiring in the cruise control circuit. Furthermore, if the cruise control system shuts off due to engine or transmission problems, it may signal a safety precaution rather than a direct fault with the cruise control itself. Lastly, don’t overlook the importance of checking fuses and relays associated with the cruise control system, as blown fuses or malfunctioning relays can lead to operational failures. By systematically addressing these common problems, you can effectively troubleshoot and resolve cruise control issues in your G65 AMG, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz G65 AMG?

When the cruise control in your Mercedes-Benz G65 AMG is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and potentially escalate into more significant problems. A defective brake pedal switch is often a primary culprit, as it can prevent the cruise control from engaging altogether. Additionally, a dead battery or a malfunctioning ABS wheel speed sensor may disrupt the system, triggering warning lights for ESP and ABS, which indicate a broader issue that could affect vehicle performance. Furthermore, older models may suffer from broken vacuum lines, while a blown fuse can also be a simple yet overlooked cause. If the throttle control system or ABS is compromised, it can lead to further complications. Therefore, it is advisable to conduct a thorough inspection of these components or consult a professional service team to diagnose and rectify the problem efficiently, ensuring your vehicle remains safe and reliable on the road.

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