2012 Mercedes-Benz C300 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2012 Mercedes-Benz C300

Find Repair Location
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 2012 Mercedes-Benz C300 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 2012 Mercedes-Benz C300 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-functioning cruise control in a 2012 Mercedes-Benz C300?

When troubleshooting the non-functioning cruise control in a 2012 Mercedes-Benz C300, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse in the fuse box, as a blown fuse can often be the simplest explanation for the malfunction. Next, ensure that the cruise control system is activated and set to the desired speed, as incorrect settings can prevent it from engaging. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying issues that may not be immediately visible. Additionally, inspect the brake pedal switch, as a faulty switch can inadvertently disengage the cruise control. Finally, examine the cruise control buttons on the steering wheel for any signs of damage or malfunction. By following these steps, you can effectively narrow down the potential causes of the cruise control issue and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2012 Mercedes-Benz C300?

When dealing with cruise control issues in a 2012 Mercedes-Benz C300, 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 brake pedal activity. Additionally, speed sensor malfunctions can disrupt the cruise control's ability to maintain a steady speed, leading to operational failures. Another potential issue is vacuum leaks within the engine, which can impair the cruise control system's functionality. Furthermore, a defective cruise control module may also be responsible for the system's inability to operate correctly. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly affect the cruise control's performance. By identifying and addressing these common issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2012 Mercedes-Benz C300?

When it comes to a non-functioning cruise control in a 2012 Mercedes-Benz C300, the urgency of addressing the problem cannot be overstated. While it may seem like a minor inconvenience, neglecting this issue can lead to more significant complications down the line. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper electronic or sensor-related problems that could affect other critical vehicle systems. For DIY enthusiasts, it’s essential to recognize that ignoring the symptoms could compromise safety, especially during extended trips where cruise control is frequently utilized to alleviate driver fatigue. Moreover, addressing the issue promptly can prevent further damage to the vehicle, ensuring that it operates at optimal performance levels. Therefore, if you notice any irregularities with your cruise control, it’s advisable to investigate the problem sooner rather than later, whether through self-diagnosis or by consulting a qualified mechanic.

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.