2014 Mercedes-Benz C350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2014 Mercedes-Benz C350 and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2014 Mercedes-Benz C350 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 C350 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-functional cruise control in a 2014 Mercedes-Benz C350?

When troubleshooting the non-functional cruise control in a 2014 Mercedes-Benz C350, start with the simplest solutions before moving on to more complex diagnostics. Begin by checking the cruise control fuse; a blown fuse can easily disrupt the system's operation. Next, verify the functionality of the cruise control switch, as a malfunctioning switch may prevent the system from engaging. It's also essential to examine the speed sensors, which are critical for the cruise control to function correctly; faulty sensors can lead to erratic behavior or complete failure of the system. Additionally, inspect the wiring connections for any signs of damage or looseness, as poor connections can hinder performance. Finally, if the issue persists, use a diagnostic scanner to check for error codes in the vehicle's computer system, which can provide further insights into the problem. By following this structured approach, you can effectively identify and address the underlying issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz C350?

When the cruise control in a 2014 Mercedes-Benz C350 ceases to function, it can be attributed to several common issues that are relatively straightforward to diagnose. One of the primary culprits is a faulty brake light switch, which is crucial for the cruise control system's operation; if this switch malfunctions, it may prevent the system from engaging, as it is designed to deactivate when the brake pedal is pressed. Additionally, problems with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to cruise control failure. Another potential issue is a malfunctioning throttle actuator, which adjusts the engine's throttle based on the cruise control settings; if this component is not working correctly, the system will struggle to operate as intended. Electrical problems, such as blown fuses or wiring issues, can also impede the cruise control's functionality. Lastly, a failure in the cruise control module itself can prevent the system from functioning properly. By understanding these common problems, DIY enthusiasts can better diagnose the issue and determine whether they can address it themselves or if professional assistance is needed.

How urgent is it to address the non-functioning cruise control in a 2014 Mercedes-Benz C350?

When it comes to the non-functioning cruise control in your 2014 Mercedes-Benz C350, understanding the urgency of the situation is crucial for both safety and vehicle performance. While it may seem like a minor inconvenience, a malfunctioning cruise control system can indicate deeper issues within the vehicle's electronic or mechanical systems. This could potentially lead to more significant problems if left unaddressed, such as erratic speed control or increased driver fatigue during long drives. Moreover, the absence of cruise control can make highway driving less comfortable and more stressful, which is particularly concerning for frequent travelers. Therefore, it is advisable to inspect the cruise control system promptly, as doing so not only enhances your driving experience but also ensures that your vehicle remains safe and reliable on the road. If you're considering a DIY approach, be sure to consult your vehicle's manual for troubleshooting tips, but don't hesitate to seek professional help if the problem persists, as safety should always be your top priority.

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