2000 Mercedes-Benz E320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2000 Mercedes-Benz E320 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 2000 Mercedes-Benz E320 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 E320 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 E320?

When troubleshooting the non-functional cruise control in a 2000 Mercedes-Benz E320, it's essential to start with the most accessible components before delving into more complex diagnostics. Begin by checking the fuse associated with the cruise control system, as a blown fuse is a common culprit for this issue. Consult your vehicle's manual to locate the fuse box and identify the specific fuse for cruise control. Next, inspect the brake pedal switch, which can also cause the cruise control to malfunction if defective. If these initial checks do not resolve the issue, consider using a diagnostic scanner to identify any error codes that may indicate deeper problems within the cruise control system. Additionally, pay attention to any warning messages displayed on the instrument cluster, as these can provide valuable insights into the system's status. Lastly, ensure that the brake pedal is not inadvertently engaged, as this will deactivate the cruise control. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2000 Mercedes-Benz E320?

When troubleshooting the cruise control system in a 2000 Mercedes-Benz E320, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal that the brake pedal is pressed. Additionally, vacuum leaks can disrupt the system's ability to maintain speed, while a defective speed sensor may provide inaccurate readings, further complicating the issue. A blown fuse can also render the cruise control inoperative, making it crucial to check the electrical components. Furthermore, throttle-related issues, such as a sticky throttle or problems with the throttle position sensor, can significantly impact performance. Lastly, a malfunctioning cruise control module may be the root cause of the problem. By systematically addressing these potential issues, DIY enthusiasts can effectively diagnose and resolve cruise control malfunctions in their vehicle.

How urgent is it to repair the non-functioning cruise control in a 2000 Mercedes-Benz E320?

When evaluating the urgency of repairing the non-functioning cruise control in a 2000 Mercedes-Benz E320, it is essential to recognize the potential consequences of inaction. While the immediate safety risk may not be apparent, a malfunctioning cruise control system can lead to erratic speed changes, increasing the likelihood of accidents and driver fatigue, particularly on long drives. Additionally, the comfort and convenience that cruise control provides are significant; without it, drivers may experience increased stress and discomfort during extended travel. Furthermore, neglecting this repair can adversely affect the vehicle's resale value. Prospective buyers often shy away from vehicles with known issues, which can diminish marketability and price. Therefore, while it may not seem critical at first glance, addressing the cruise control malfunction promptly is advisable to ensure a safer, more enjoyable driving experience and to protect the vehicle's long-term value.

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