2020 Mercedes-Benz G550 Cruise Control Isn't Working

Fixing cruise control issues in the 2020 Mercedes-Benz G550

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Reviewed by
Aisha
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 2020 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 2020 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.

What steps should I take to diagnose the non-functioning cruise control in my 2020 Mercedes-Benz G550?

To effectively diagnose the non-functioning cruise control in your 2020 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 located in the fuse box, as a blown fuse is a common and easily rectifiable issue. Next, examine the cruise control buttons on your steering wheel for any signs of damage or sticking, as these can hinder the system's operation. Following this, verify the functionality of the speed sensor, since a malfunction here can disrupt the cruise control's ability to engage. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are operating correctly, as faulty switches can prevent activation. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as these can lead to failures. By methodically following these steps, you can identify the root cause of the cruise control malfunction and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2020 Mercedes-Benz G550?

When the cruise control in your 2020 Mercedes-Benz G550 stops functioning, it can be frustrating, but understanding the common issues can help you diagnose the problem. One frequent culprit is a faulty speed sensor, which is essential for the cruise control system to accurately gauge your vehicle's speed. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Another potential issue is a malfunctioning brake light switch; if this switch sends incorrect signals, it can cause the cruise control to disengage unexpectedly, even when the brakes are not applied. Additionally, problems with the throttle actuator can disrupt communication between the cruise control and the engine, preventing the system from maintaining speed. A blown fuse can also be a simple yet effective reason for cruise control failure, as it can cut off power to the system entirely. Lastly, software glitches in the vehicle's computer system may lead to cruise control issues, which can often be resolved by resetting or updating the software. By identifying these common problems, you can take the first steps toward troubleshooting and potentially fixing the cruise control system in your G550.

How urgent is it to address the non-functioning cruise control in a 2020 Mercedes-Benz G550?

When it comes to the non-functioning cruise control in a 2020 Mercedes-Benz G550, addressing the issue should be a priority for any DIY enthusiast. While it may not seem like an immediate emergency, the implications of ignoring this malfunction can be significant. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper issues within the vehicle's electronic systems. This could lead to compromised performance and safety, as the cruise control is integrated with other critical components of the vehicle. Furthermore, neglecting to repair the cruise control could result in increased driver fatigue, reduced fuel efficiency, and even potential safety hazards on the road. Therefore, it is advisable to inspect and repair the cruise control system promptly, either by consulting a qualified mechanic or utilizing DIY resources, to ensure the vehicle remains safe and efficient for all driving conditions.

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