2002 Mercedes-Benz G500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2002 Mercedes-Benz G500 and How to Fix Them

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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 2002 Mercedes-Benz G500 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 2002 Mercedes-Benz G500 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 initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2002 Mercedes-Benz G500?

When troubleshooting the non-functioning cruise control in a 2002 Mercedes-Benz G500, it's crucial to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, inspect the cruise control buttons on the 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 sensors, since faulty sensors can disrupt the cruise control's ability to maintain speed. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying electronic issues. Additionally, examine the vacuum lines for leaks or damage, as these are vital for the cruise control system's performance. Finally, ensure that the brake and clutch switches are functioning correctly, as malfunctioning switches can prevent the cruise control from engaging. By methodically working through these steps, you can effectively diagnose and potentially resolve the cruise control issue in your G500.

What are the common problems that could cause the cruise control to stop working in a 2002 Mercedes-Benz G500?

When troubleshooting cruise control issues in a 2002 Mercedes-Benz G500, 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 by failing to signal that the brakes are not applied. Additionally, a defective cruise control module can disrupt the system's functionality, necessitating repair or replacement. Vacuum leaks within the cruise control system can also hinder its operation, so inspecting for and sealing any leaks is crucial. Another potential issue is a faulty speed sensor, which can affect the system's ability to maintain a set speed. Lastly, electrical problems, including faulty wiring or connections, can lead to cruise control malfunctions. By systematically checking these components, DIY enthusiasts can effectively diagnose and potentially resolve cruise control issues in their G500.

How urgent is it to address the non-functioning cruise control in a 2002 Mercedes-Benz G500?

Addressing the non-functioning cruise control in a 2002 Mercedes-Benz G500 is an urgent matter that should not be overlooked. The primary concern is safety; a malfunctioning cruise control system can lead to erratic speed changes, increasing the risk of accidents and compromising the safety of both the driver and other road users. Additionally, the comfort of your driving experience is significantly affected when you cannot rely on cruise control to maintain a steady speed, leading to fatigue during long drives. Furthermore, neglecting this issue can adversely affect the vehicle's resale value, as potential buyers are likely to be deterred by a car with non-functional features. Therefore, it is crucial to diagnose and repair the cruise control system promptly to ensure a safe, comfortable, and valuable driving experience.

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Troubleshooting 2002 Mercedes-Benz G500 Cruise Control Issues