2015 Mercedes-Benz C300 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2015 Mercedes-Benz C300

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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 2015 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 2015 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 take when the cruise control isn't working on a 2015 Mercedes-Benz C300?

When faced with a malfunctioning cruise control system in your 2015 Mercedes-Benz C300, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel; if they are unresponsive, they may need replacement. It's also crucial to verify the operation of the speed sensors, as these components play a vital role in maintaining the cruise control's performance. Additionally, examine the brake pedal switch, since the cruise control disengages when the brake is applied; a faulty switch could be the culprit. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Lastly, inspect the wiring and connections associated with the cruise control system for any signs of damage or loose connections, as these can lead to malfunctions. By following these steps, you can effectively diagnose and potentially resolve the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz C300?

When the cruise control in your 2015 Mercedes-Benz C300 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit is a faulty brake light switch, which is crucial for the cruise control system as it disengages the system when the brake pedal is pressed. If this switch is malfunctioning, it may prevent the cruise control from engaging at all. Another potential issue is a malfunctioning speed sensor; if this component fails, it can lead to incorrect speed readings, causing the cruise control to disengage unexpectedly. Additionally, a failing throttle actuator can hinder the system's ability to maintain the desired speed, while problems with the cruise control module itself, such as electrical faults, can also disrupt functionality. Lastly, don't overlook the possibility of vacuum leaks in the engine system, as these can significantly impact the cruise control's operation. By identifying these common issues, you can take the first steps toward troubleshooting and potentially restoring your cruise control system.

How urgent is it to address the non-functioning cruise control in a 2015 Mercedes-Benz C300?

When it comes to the non-functioning cruise control in a 2015 Mercedes-Benz C300, addressing the issue promptly is essential for maintaining the vehicle's overall functionality and enhancing the driving experience. While the absence of cruise control may not pose an immediate safety risk, it can lead to increased driver fatigue during long trips, as the driver must continuously manage the accelerator. Moreover, neglecting this issue could potentially mask underlying problems that may escalate over time, resulting in more extensive and costly repairs. Therefore, it is advisable to seek a professional diagnosis from a qualified mechanic or authorized service center to accurately identify the root cause of the malfunction. By taking timely action, you not only restore the convenience of cruise control but also safeguard against future complications that could arise from ignoring the symptoms.

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2015 Mercedes-Benz C300 Cruise Control Issues & Repair Costs