2015 Mercedes-Benz C350 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2015 Mercedes-Benz C350

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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 2015 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 2015 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 steps to diagnose the non-functioning cruise control in a 2015 Mercedes-Benz C350?

When diagnosing the non-functioning cruise control in a 2015 Mercedes-Benz C350, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse in the fuse box, as a blown fuse can often be the culprit behind the malfunction. Next, inspect the cruise control buttons on the steering wheel to ensure they are not stuck or damaged, as this can prevent the system from engaging. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying issues within the vehicle's onboard computer. Additionally, verify the functionality of the speed sensors, as accurate speed readings are crucial for the cruise control system to operate correctly. It's also important to examine the brake and clutch switches, which are vital for disengaging the cruise control when necessary. Inspecting the wiring and connections for any signs of wear or corrosion can help identify potential electrical issues. Finally, testing the cruise control module will confirm whether it is receiving power and sending signals appropriately. If these steps do not resolve the issue, consulting a professional mechanic or an authorized Mercedes-Benz service center is recommended for further diagnosis and repair. This methodical approach not only helps in identifying the problem efficiently but also ensures that you cover all bases before seeking professional assistance.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz C350?

When troubleshooting the cruise control system in a 2015 Mercedes-Benz C350, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since the system is designed to disengage when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain speed, as it relies on accurate readings to function correctly. Another potential issue is vacuum leaks within the engine, which can interfere with the cruise control's operation, causing it to malfunction or disengage unexpectedly. Furthermore, a defective cruise control module may require replacement or repair to restore functionality. Lastly, electrical problems, such as blown fuses or wiring issues, can also impact the cruise control system. By identifying and addressing these common issues, you can effectively troubleshoot and resolve problems with the cruise control in your vehicle.

How urgent is it to address the malfunctioning cruise control in a 2015 Mercedes-Benz C350?

Addressing a malfunctioning cruise control in a 2015 Mercedes-Benz C350 is crucial for several reasons. First and foremost, a faulty cruise control system can compromise your ability to maintain a steady speed, which not only affects your driving comfort but also poses significant safety risks on the road. If the system fails while driving, it could lead to erratic speed changes, increasing the likelihood of accidents. Additionally, issues with the cruise control may signal deeper electronic or sensor problems within the vehicle, which could impact other critical systems. Ignoring these symptoms can lead to decreased fuel efficiency and a less enjoyable driving experience, as the cruise control is designed to enhance long-distance travel. Moreover, timely intervention can prevent more extensive damage, potentially saving you from costly repairs down the line. Therefore, if you notice any irregularities with your cruise control, it is advisable to diagnose and address the issue promptly, whether through DIY troubleshooting or by consulting a qualified mechanic.

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2015 Mercedes-Benz C350 Cruise Control Issues & Repair Costs