Mercedes-Benz GL450 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz GL450 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz GL450 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 GL450 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 GL450

When troubleshooting cruise control issues in your Mercedes-Benz GL450, it's essential to adopt a methodical diagnostic approach. Begin by checking the brake pedal switch, as a defective switch is a common culprit that can prevent the cruise control from engaging. If the switch appears to be functioning correctly, inspect the cruise control module for any signs of failure, as a faulty module can lead to intermittent or complete system malfunctions. Next, examine the ABS wheel speed sensor, since issues with this component can trigger warning lights and affect cruise control performance. If these components are in good condition, consider potential engine or transmission problems, as these can also cause the cruise control to disengage unexpectedly. By systematically addressing these areas, you can effectively identify and resolve the underlying issues affecting your cruise control system, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz GL450?

When dealing with cruise control malfunctions in a Mercedes-Benz GL450, it's essential to understand the common problems that may be at play. One frequent culprit is a defective brake pedal switch, which can prevent the cruise control from engaging properly. Additionally, a dead battery can disrupt the electrical systems, leading to cruise control issues. Another significant factor to consider is the ABS wheel speed sensor; if this sensor is faulty, it may trigger warning lights for the Electronic Stability Program (ESP) and Anti-lock Braking System (ABS), indicating a deeper problem that could affect cruise control functionality. Lastly, a bad spiral cable within the steering wheel can hinder communication between the cruise control switch and the vehicle's systems, preventing it from turning on. By systematically checking these components, DIYers can effectively diagnose and potentially resolve cruise control issues in their GL450, restoring functionality and enhancing their driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz GL450?

When the cruise control in your Mercedes-Benz GL450 is not functioning, it’s crucial to understand the potential causes and the urgency of addressing them. Common issues include a malfunctioning cruise control module, defective brake pedal switches, or problems with the ABS wheel speed sensor. These components are integral to the cruise control system's operation, and neglecting to address these symptoms can lead to safety risks while driving. For instance, a faulty brake pedal switch can inadvertently disable the cruise control, leaving you without this essential feature when you need it most. Additionally, if the ABS sensor fails, it may trigger warning lights that indicate deeper issues within the vehicle's systems, potentially leading to more significant damage if left unchecked. Other factors, such as a dead battery or problems with the throttle actuation system, can also contribute to cruise control failure. Therefore, if you notice any signs of malfunction, it is advisable to seek professional inspection and repair promptly to ensure your vehicle remains safe and reliable on the road.

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