2003 Mercedes-Benz C240 Cruise Control Isn't Working

Fix Cruise Control Issues in Your 2003 Mercedes-Benz C240

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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 2003 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 2003 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 steps to diagnose the non-functioning cruise control in a 2003 Mercedes-Benz C240?

When diagnosing the non-functioning cruise control in a 2003 Mercedes-Benz C240, it's crucial to follow a methodical approach that begins with the simplest potential issues. Start by checking the fuse related to the cruise control system, as a blown fuse is a common and straightforward problem to fix. Next, inspect the cruise control switch to ensure it is working correctly; a faulty switch can easily prevent the system from engaging. The brake pedal switch is another vital component to examine, as a malfunction here can disable the cruise control entirely. Utilizing a diagnostic scanner to check for error codes can also be beneficial, as it may reveal specific issues affecting the system. Additionally, confirm that the speed sensor is functioning properly, since it provides essential speed data for the cruise control to operate. Finally, inspect the vacuum lines for any signs of leaks or damage, as these can disrupt the system's performance. By systematically addressing these areas, you can effectively diagnose and resolve the issues with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz C240?

When dealing with cruise control issues in a 2003 Mercedes-Benz C240, it's essential to understand the common problems that may be at play. One of the primary culprits is a faulty brake light switch, which can prevent the system from engaging if it fails to detect when the brake pedal is pressed. Additionally, a defective cruise control module can disrupt the entire system's functionality, leading to a complete failure of the cruise control feature. Another potential issue is vacuum leaks, which can interfere with the system's ability to maintain a steady speed. Furthermore, a malfunctioning speed sensor can hinder the cruise control's capacity to regulate speed accurately. Lastly, electrical problems, such as blown fuses or wiring issues, can also contribute to the cruise control's malfunction. By identifying and addressing these common issues, DIYers can effectively troubleshoot and potentially resolve the cruise control problems in their Mercedes-Benz C240.

How urgent is it to repair the non-functioning cruise control in a 2003 Mercedes-Benz C240?

Repairing the non-functioning cruise control in a 2003 Mercedes-Benz C240 should be considered a priority due to its implications for safety and overall driving experience. A malfunctioning cruise control system can lead to increased driver fatigue, as maintaining a consistent speed becomes more challenging, especially on long journeys. This fatigue can distract the driver, heightening the risk of accidents. Additionally, the absence of cruise control diminishes driving comfort, making extended trips less enjoyable and more taxing. Beyond immediate safety and comfort concerns, neglecting this repair can also impact the vehicle's resale value. Prospective buyers often look for fully functional features, and a non-working cruise control system may deter them or lead to lower offers. Therefore, while the car may still operate without it, addressing the cruise control issue is essential for ensuring a safer, more comfortable driving experience and preserving the vehicle's long-term value.

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