2005 Mercedes-Benz C240 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Mercedes-Benz C240 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 2005 Mercedes-Benz C240 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 2005 Mercedes-Benz C240 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 are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2005 Mercedes-Benz C240?

When troubleshooting the non-functional cruise control in a 2005 Mercedes-Benz C240, start with the simplest checks to avoid unnecessary complications. Begin by inspecting the fuse associated with the cruise control system; a blown fuse can often be the culprit behind the malfunction. Next, verify that the cruise control settings are correctly configured on both the steering wheel and dashboard, as incorrect settings can prevent the system from engaging. It’s also important to test the cruise control buttons on the steering wheel to ensure they are operational. If these initial checks do not resolve the issue, utilize a diagnostic scanner to look for any error codes that may indicate deeper problems within the vehicle's onboard computer. Additionally, inspect the vacuum lines connected to the cruise control actuator for any signs of leaks or damage, as these can significantly impact functionality. Lastly, check the brake lights; a malfunctioning brake light switch can inadvertently disable the cruise control system. By systematically following these steps, you can effectively diagnose and potentially resolve the issues affecting your cruise control.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz C240?

When the cruise control in your 2005 Mercedes-Benz C240 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit is a defective component or sensor that is essential for the cruise control system's operation. Additionally, a blown fuse or a malfunctioning brake light can disrupt the system, as these elements are interconnected. Another common issue is a faulty brake switch, which can prevent the cruise control from engaging properly. It's also worth checking the throttle for any irregularities, as problems here can affect the system's responsiveness. Lastly, issues with the brake light switch or wheel speed sensors can lead to cruise control failure. While some of these problems can be addressed through DIY methods, it is often wise to consult a professional for a thorough inspection to ensure your vehicle's cruise control operates safely and effectively.

How urgent is it to repair the non-functioning cruise control in a 2005 Mercedes-Benz C240?

When evaluating the urgency of repairing the non-functioning cruise control in your 2005 Mercedes-Benz C240, it's essential to consider how often you utilize this feature and the driving conditions you typically encounter. While cruise control significantly enhances comfort on long highway drives by allowing you to maintain a steady speed, it is not classified as a critical safety component like brakes or airbags. Therefore, if your driving habits include frequent long-distance travel, addressing the repair sooner may improve your overall driving experience and reduce fatigue. Conversely, if your daily routes consist mainly of short trips or heavy traffic where cruise control is seldom used, you might opt to postpone the repair until it becomes more convenient. Ultimately, the decision hinges on your personal reliance on this feature; understanding your driving patterns will guide you in determining whether to prioritize the repair or wait for a more suitable time.

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2005 Mercedes-Benz C240 Cruise Control Issues & Repairs