2016 Mercedes-Benz CLS550 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2016 Mercedes-Benz CLS550 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 2016 Mercedes-Benz CLS550 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 CLS550 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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What steps should I take to diagnose the non-functioning cruise control in my 2016 Mercedes-Benz CLS550?

When diagnosing the non-functioning cruise control in your 2016 Mercedes-Benz CLS550, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily rectifiable issue that can halt the system's operation. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can prevent the system from engaging. Following this, verify the functionality of the speed sensors, since faulty sensors can disrupt the cruise control's ability to maintain speed. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are functioning correctly, as malfunctioning switches can disable the cruise control. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as these can lead to operational failures. By methodically following these steps, you can effectively identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 2016 Mercedes-Benz CLS550?

When troubleshooting the cruise control system in a 2016 Mercedes-Benz CLS550, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, ultimately causing the cruise control to fail. Additionally, problems with the brake light switch can prevent the cruise control from engaging or disengaging correctly, as this switch plays a crucial role in the system's operation. Another potential culprit is a malfunctioning throttle actuator, which can hinder communication between the cruise control and the engine, leading to operational issues. Furthermore, a defective cruise control module may result in a complete system failure, necessitating replacement for proper functionality. Lastly, various electrical problems, such as wiring issues or blown fuses, can also impact the cruise control's performance. By identifying and addressing these common issues, DIY enthusiasts can effectively diagnose and potentially resolve cruise control problems in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2016 Mercedes-Benz CLS550?

Addressing the non-functioning cruise control in a 2016 Mercedes-Benz CLS550 should be treated with a sense of urgency, as neglecting this issue can lead to more significant problems down the line. While it may initially appear to be a minor inconvenience, a malfunctioning cruise control system can indicate underlying issues that may affect the vehicle's overall performance and safety. For instance, an illuminated check engine light often accompanies cruise control failures, signaling that a diagnostic check is necessary to prevent further complications. Common culprits such as blown fuses, faulty brake switches, or sensor malfunctions can escalate into more severe engine or transmission problems if left unaddressed. Moreover, a defective cruise control can disrupt the driving experience, making long journeys less comfortable and potentially distracting the driver. Therefore, it is crucial to systematically identify and resolve these issues to ensure not only the functionality of the cruise control but also the overall safety and reliability of your vehicle. Taking prompt action can help maintain optimal driving conditions and prevent costly repairs in the future.

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2016 Mercedes-Benz CLS550 Cruise Control Issues & Repairs