2019 Mercedes-Benz SL550 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2019 Mercedes-Benz SL550

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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 2019 Mercedes-Benz SL550 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 2019 Mercedes-Benz SL550 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 steps should I take to diagnose the non-functioning cruise control in my 2019 Mercedes-Benz SL550?

To effectively diagnose the non-functioning cruise control in your 2019 Mercedes-Benz SL550, 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 fuse box, as a blown fuse is a common and easily rectifiable issue. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can hinder the system's operation. Following this, verify the functionality of the speed sensor, since a malfunction here can disrupt the cruise control's ability to engage. 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 faulty switches can prevent activation. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as poor connections can lead to failure. By following this structured diagnostic approach, you can efficiently 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 2019 Mercedes-Benz SL550?

When troubleshooting the cruise control system in a 2019 Mercedes-Benz SL550, it's essential to consider several common issues that may be at play. A faulty speed sensor is often a primary culprit, as it can hinder the system's ability to accurately gauge the vehicle's speed, preventing engagement or consistent speed maintenance. Additionally, the brake light switch can pose problems; if it malfunctions, the cruise control may disengage unexpectedly when the brake pedal is pressed. Another area to inspect is the throttle actuator, which is responsible for controlling the throttle opening; any malfunction here can disrupt the cruise control's performance. Furthermore, a defective cruise control module can lead to a complete lack of response from the system, making it crucial to check for any signs of failure. Lastly, don't overlook potential electrical issues, such as wiring problems or blown fuses, which can significantly impact the cruise control's functionality. By systematically examining these components, DIYers can identify and address the root cause of cruise control issues in their SL550.

How urgent is it to address the non-functioning cruise control in a 2019 Mercedes-Benz SL550?

When faced with a non-functioning cruise control in a 2019 Mercedes-Benz SL550, it is crucial to recognize the urgency of the situation. Cruise control not only enhances driving comfort by maintaining a steady speed, but it also plays a significant role in fuel efficiency and reducing driver fatigue during long journeys. However, a malfunctioning system may signal deeper issues within the vehicle's mechanics, potentially compromising overall performance and safety. Ignoring this problem could lead to hazardous driving conditions, as the driver may struggle to maintain control or respond to sudden changes in traffic. Moreover, delaying repairs might exacerbate the underlying issue, resulting in more extensive and costly damage. Therefore, it is advisable to diagnose and address any cruise control malfunctions promptly to ensure the safe and efficient operation of your vehicle.

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