2016 Mercedes-Benz CLS400 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2016 Mercedes-Benz CLS400 and How to Fix Them

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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 2016 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 2016 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 are the steps to diagnose the cruise control issue in a 2016 Mercedes-Benz CLS400?

To effectively diagnose a cruise control issue in a 2016 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 located in the vehicle's fuse box, as a blown fuse can often be the root of the problem. Next, examine the cruise control buttons on the steering wheel to ensure they are functioning properly and not stuck, as this can impede operation. Utilizing a diagnostic scanner to check for error codes in the vehicle's onboard computer can provide valuable insights into any underlying issues. Additionally, inspect the speed sensors, as they are critical for the cruise control system's functionality. It’s also important to examine the wiring connections associated with the cruise control system for any signs of damage or loose connections. Finally, test the cruise control module to confirm it is sending and receiving signals correctly. If these steps do not resolve the issue, seeking assistance from a professional mechanic or an authorized Mercedes-Benz service center is recommended for a thorough diagnosis and repair. 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 2016 Mercedes-Benz CLS400?

When troubleshooting the cruise control system in a 2016 Mercedes-Benz CLS400, it's important to consider several common problems that could be at play. One of the primary culprits is a faulty speed sensor, which can hinder the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, issues with the brake light switch can lead to unexpected disengagement of the cruise control when the brake pedal is pressed, even if this action is unintentional. Another potential issue is a malfunctioning throttle actuator, which disrupts communication between the cruise control system and the engine, resulting in operational failures. Furthermore, a defective cruise control module may prevent the system from receiving the necessary signals to function correctly. Lastly, electrical problems such as blown fuses, wiring issues, or faulty connections can also significantly impact the cruise control's performance. By understanding these common problems, DIY enthusiasts can better diagnose the issue and determine whether they can resolve it themselves or if professional assistance is needed.

How urgent is it to address the malfunctioning cruise control in my 2016 Mercedes-Benz CLS400?

When it comes to your 2016 Mercedes-Benz CLS400, addressing a malfunctioning cruise control system is not just a matter of convenience; it is a critical safety concern that requires immediate attention. A malfunction can lead to unpredictable acceleration or deceleration, posing significant risks while driving, especially on highways where maintaining a steady speed is essential. Beyond safety, a faulty cruise control system can detract from your overall driving experience, making long journeys more cumbersome and less enjoyable. Additionally, neglecting this issue can compromise your vehicle's performance, as all systems are interconnected, and a malfunctioning component can lead to further complications. Most importantly, ignoring the problem could result in more extensive damage, leading to costly repairs down the line. Therefore, it is crucial to have your cruise control system diagnosed and repaired by a qualified mechanic as soon as possible to ensure your vehicle remains safe and performs optimally.

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