2004 Mercedes-Benz C240 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2004 Mercedes-Benz C240 and How to Fix Them

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Reviewed by
Bo Fader
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 2004 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 2004 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 cruise control issue in a 2004 Mercedes-Benz C240?

When diagnosing a cruise control issue in a 2004 Mercedes-Benz C240, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable problem that can disrupt the system's functionality. Next, assess the cruise control switch on the steering wheel to ensure it is operational; a malfunctioning switch can prevent the system from engaging. Following this, examine the speed sensors, which are crucial for relaying accurate information to the cruise control system; any faults here can lead to significant issues. Utilizing a diagnostic scanner to check for error codes in the vehicle's onboard computer can provide insights into underlying problems. Additionally, inspect the vacuum lines associated with the cruise control system, as any leaks or blockages can hinder performance. Finally, test the cruise control module itself, as a defective module may require repair or replacement. By following this structured diagnostic approach, you can effectively identify and address the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2004 Mercedes-Benz C240?

When troubleshooting the cruise control system in a 2004 Mercedes-Benz C240, it's essential to consider several common problems that could be affecting its functionality. 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 may lead to complete system failure, rendering the cruise control inoperable. Another potential issue is vacuum leaks within the engine, which can disrupt the system's ability to maintain speed effectively. Furthermore, a malfunctioning speed sensor can hinder the cruise control's capacity to regulate speed accurately. Lastly, electrical issues, such as blown fuses or wiring problems, can also interfere with the cruise control's performance. By systematically addressing these common issues, you can potentially restore the cruise control system to proper working order.

How urgent is it to repair the non-functioning cruise control in a 2004 Mercedes-Benz C240?

When it comes to the urgency of repairing the non-functioning cruise control in a 2004 Mercedes-Benz C240, several critical factors must be considered. First and foremost, safety is paramount; a malfunctioning cruise control system can lead to erratic vehicle behavior, such as unexpected acceleration or deceleration, which poses a significant risk to both the driver and other road users. Additionally, the comfort of driving is compromised without a functioning cruise control, especially during long trips where maintaining speed manually can lead to increased fatigue. Furthermore, issues with the cruise control may signal deeper mechanical problems within the vehicle, making timely repairs essential to prevent further damage and ensure optimal performance. Therefore, addressing the cruise control malfunction promptly is not just a matter of convenience but a crucial step in maintaining safety and vehicle integrity.

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2004 Mercedes-Benz C240 Cruise Control Issues & Repairs