2000 Mercedes-Benz ML320 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2000 Mercedes-Benz ML320

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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 2000 Mercedes-Benz ML320 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 2000 Mercedes-Benz ML320 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-functional cruise control in a 2000 Mercedes-Benz ML320?

When troubleshooting the non-functional cruise control in a 2000 Mercedes-Benz ML320, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse can often be the simplest fix. Next, inspect the wiring for any visible damage or loose connections, which can disrupt the system's functionality. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying issues that may not be immediately apparent. After that, test the cruise control switch on the steering wheel to ensure it is operational. If your vehicle uses a vacuum system for cruise control, examine the vacuum lines for leaks or blockages that could hinder performance. Additionally, inspect the cruise control module for any signs of damage and verify that the speed sensors are functioning correctly, as they play a crucial role in the system's operation. By following these steps, you can effectively narrow down the potential causes of the cruise control malfunction and take appropriate action to resolve the issue.

What are the common problems that could cause the cruise control to stop working in a 2000 Mercedes-Benz ML320?

When the cruise control in a 2000 Mercedes-Benz ML320 ceases to function, several common problems may be at play. One of the primary culprits could be a failed control module, which is essential for the system's operation. Additionally, issues with sensors or switches can disrupt the communication necessary for cruise control to engage. Throttle actuation problems may also arise, preventing the vehicle from maintaining speed as intended. A blown fuse is another straightforward issue that can easily be checked and replaced. Furthermore, a faulty brake light or brake switch can inadvertently signal that the brakes are engaged, which disables the cruise control system. It's also crucial to consider that any check engine light or underlying engine-related problems can interfere with cruise control functionality. For those looking to troubleshoot these issues, a thorough inspection of these components can often reveal the source of the problem, but if the issue persists, consulting a professional service team is advisable to ensure a proper fix.

How urgent is it to repair the non-functioning cruise control in a 2000 Mercedes-Benz ML320?

When evaluating the urgency of repairing the non-functioning cruise control in your 2000 Mercedes-Benz ML320, it's essential to recognize that while it may not pose an immediate safety threat like malfunctioning brakes, it still warrants timely attention. The absence of cruise control can lead to increased driver fatigue, especially during long drives, as maintaining a consistent speed becomes more challenging. This can distract the driver, potentially compromising safety on the road. Additionally, the comfort and convenience that cruise control provides during extended trips cannot be overlooked; without it, driving may become less enjoyable and more physically taxing. Furthermore, addressing this issue promptly can positively impact the vehicle's resale value. Prospective buyers often view non-functional features as red flags, which could deter them from purchasing your vehicle or lead to lower offers. Therefore, while the urgency may not be as critical as other mechanical failures, repairing the cruise control system should be prioritized to enhance safety, improve driving comfort, and maintain the overall value of your vehicle.

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2000 Mercedes-Benz ML320 Cruise Control Issues & Fix Costs