2014 Mercedes-Benz C300 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2014 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 2014 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 2014 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 steps to diagnose the cruise control issue in a 2014 Mercedes-Benz C300?

To effectively diagnose a cruise control issue in a 2014 Mercedes-Benz C300, it's essential to adopt a systematic approach that begins with the simplest potential problems before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to engagement issues. Utilizing an OBD-II scanner to check for error codes is a crucial step, as it can reveal specific malfunctions within the cruise control system. Additionally, verify the functionality of the vehicle's speed sensors, which are vital for the cruise control to operate correctly. Don't overlook the brake and clutch switches; if these are malfunctioning, they can prevent the cruise control from engaging altogether. Finally, conduct a thorough inspection of the wiring and connections associated with the cruise control system, looking for any signs of damage or corrosion that could impede performance. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz C300?

When troubleshooting the cruise control system in a 2014 Mercedes-Benz C300, it's essential to consider several common problems that could be at play. One of the first areas to check is the brake light switch, as a faulty switch can prevent the cruise control from engaging properly; this switch is designed to disengage the system when the brake pedal is pressed. Additionally, issues with the speed sensor can lead to cruise control failure, since the system relies on accurate speed readings to function effectively. Another critical component to inspect is the throttle actuator; if it malfunctions, it can hinder the cruise control's ability to maintain a steady speed. Electrical problems, such as blown fuses or wiring issues, can also disrupt the functionality of the cruise control system. Lastly, a malfunctioning cruise control module may be the root cause of the issue. By systematically checking these components, DIYers can identify and potentially resolve the problem before resorting to professional assistance.

How urgent is it to address the non-functioning cruise control in a 2014 Mercedes-Benz C300?

When it comes to a non-functioning cruise control in a 2014 Mercedes-Benz C300, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potential damage to the vehicle. Cruise control is designed to enhance driving comfort and efficiency, particularly on long journeys, but its failure may signal deeper issues within the vehicle's systems. For DIY enthusiasts, it’s crucial to recognize that a malfunctioning cruise control could be indicative of electrical faults, sensor failures, or even problems with the throttle system. Ignoring these symptoms not only compromises the convenience of the feature but could also escalate into more severe mechanical failures, leading to costly repairs. Therefore, it is advisable to investigate the root cause of the malfunction promptly, whether through self-diagnosis or by consulting a professional, to ensure the vehicle remains safe and reliable on the road.

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