Mercedes-Benz C240 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz C240 and How to Fix Them

Find Repair Location
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 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz C240

When troubleshooting cruise control issues in your Mercedes-Benz C240, it's essential to adopt a systematic diagnostic approach. Begin by checking the control module, as this is often the heart of the cruise control system. If the module appears to be functioning correctly, move on to inspecting the ABS wheel speed sensors, as failures here can disrupt the cruise control's operation. Next, examine the throttle actuation; any irregularities in throttle response can lead to cruise control malfunctions. It's also crucial to assess the electrical components, particularly the spiral cable in the steering wheel and any connectors, as these can be sources of electrical failure. Lastly, don't overlook the brake light circuit; faulty brake lights can inadvertently signal the cruise control to disengage. By methodically addressing these areas, you can effectively diagnose and resolve the cruise control issues in your vehicle, ensuring a smoother driving experience.

What Are the Common Causes of Cruise Control Malfunction in a Mercedes-Benz C240?

When experiencing cruise control malfunction in a Mercedes-Benz C240, it's essential to understand the common problems that could be at play. One of the primary culprits is a defective cruise control switch or module, which can often be tested for functionality and replaced if found faulty. Additionally, a malfunctioning brake pedal switch is a frequent issue, as it can prevent the cruise control from engaging properly. It's also worth checking the vehicle's battery; a dead battery can disrupt the cruise control system's operation. Another critical component to inspect is the ABS wheel speed sensor, as its failure can trigger warning lights and affect cruise control performance. A blown fuse is a straightforward issue that can easily be overlooked, so checking the fuses related to the cruise control system is advisable. Furthermore, problems with the throttle control system or a broken vacuum line in older models can lead to cruise control failures. Lastly, while engine-related issues may not directly impact cruise control, any check engine light or significant engine problems should be addressed, as they can indirectly affect the system's functionality. By systematically diagnosing these components, DIY enthusiasts can effectively troubleshoot and resolve cruise control malfunctions in their Mercedes-Benz C240.

Why is the Cruise Control Not Working in a Mercedes-Benz C240?

When the cruise control in your Mercedes-Benz C240 is not functioning, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. A malfunctioning cruise control system may stem from various causes, including a failed cruise control module, defective sensors, or issues with the throttle actuation. If the brake pedal switch is faulty, it can prevent the system from engaging, which could be particularly dangerous during long drives. Additionally, problems with the ABS wheel speed sensor or even a dead battery can disrupt the cruise control functionality. Ignoring these symptoms not only compromises your driving experience but could also lead to more significant repairs down the line, such as damage to the ABS system or electrical components. Therefore, it’s essential to diagnose and resolve these issues as soon as they arise to ensure your vehicle remains safe and reliable on the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.