2015 Mercedes-Benz CLS400 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Mercedes-Benz CLS400 and How to Fix Them

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Reviewed by
Bo Fader
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 CLS400 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 CLS400 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What steps should I take to diagnose the cruise control issue in my 2015 Mercedes-Benz CLS400?

To effectively diagnose the cruise control issue in your 2015 Mercedes-Benz CLS400, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, examine the cruise control buttons on the steering wheel for any signs of damage or wear that could hinder their operation. Utilizing an OBD-II scanner is also crucial; it allows you to retrieve error codes that may pinpoint specific problems within the cruise control system. Following this, check the vehicle's speed sensors, as they are integral to the cruise control's performance. Additionally, inspect the wiring connections associated with the cruise control system for any loose or damaged wires that could be causing the malfunction. If these preliminary checks do not resolve the issue, proceed to test the cruise control module itself, as a faulty module can lead to persistent problems. Should you find yourself unable to identify the issue after these steps, it may be wise to consult a professional mechanic or an authorized Mercedes-Benz service center for expert assistance. This methodical approach not only helps in identifying the problem efficiently but also ensures that you cover all potential causes systematically.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz CLS400?

When the cruise control in a 2015 Mercedes-Benz CLS400 ceases to function, several common problems may be at play. One of the primary culprits is a faulty speed sensor, which can disrupt the system's ability to maintain the desired speed. Additionally, a malfunctioning brake light switch can inadvertently disengage the cruise control, even when the brakes are not applied. Another potential issue lies with the throttle actuator; if it fails, communication between the cruise control system and the engine may be compromised, leading to operational difficulties. Furthermore, vacuum leaks within the cruise control system can result in a loss of pressure, hindering the system's performance. Lastly, various electrical problems, such as wiring issues or blown fuses, can also interfere with cruise control functionality. By understanding these common issues, DIYers can better diagnose the problem and take appropriate steps to restore their vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2015 Mercedes-Benz CLS400?

Addressing a malfunctioning cruise control system in a 2015 Mercedes-Benz CLS400 is of utmost importance due to the potential safety risks and performance issues it presents. A malfunction can lead to unexpected acceleration or deceleration, which not only endangers the driver and passengers but also other road users. Furthermore, neglecting this issue can compromise the overall driving experience, making it less convenient and enjoyable. Additionally, a faulty cruise control system may contribute to increased fuel consumption and could even lead to damage in other vehicle components, resulting in more costly repairs down the line. Therefore, it is crucial to diagnose and repair any cruise control malfunctions promptly, ensuring the vehicle operates safely and efficiently while preventing further complications. Taking swift action not only enhances safety but also preserves the integrity and performance of your vehicle.

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2015 Mercedes-Benz CLS400 Cruise Control Issues & Repairs