Mercedes-Benz SL55 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz SL55 AMG 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz SL55 AMG 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 Mercedes-Benz SL55 AMG 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz SL55 AMG

When troubleshooting cruise control issues in your Mercedes-Benz SL55 AMG, begin by checking the simplest components first. Start with the cruise control switch; ensure it is functioning correctly and not stuck or damaged. Next, inspect the vehicle's fuses related to the cruise control system, as a blown fuse can easily disrupt functionality. If these initial checks do not resolve the issue, move on to examining the throttle actuation system, as problems here can prevent the cruise control from engaging. Additionally, pay attention to any warning messages displayed on the instrument cluster, as these can provide valuable clues about the underlying issue. If the problem persists after these steps, it may be necessary to delve deeper into the control module and associated sensors, which often require specialized diagnostic tools. Remember, while DIY troubleshooting can be effective, some issues may necessitate professional assistance to ensure a thorough and accurate resolution.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz SL55 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz SL55 AMG, it's crucial to consider several common problems that could be at play. One of the primary culprits is the ABS wheel speed sensor; if this sensor fails, it can disable the entire cruise control system. Conducting a diagnostic test is a vital first step, as it helps pinpoint the specific issue affecting the cruise control functionality. Additionally, the cruise control switch and module are critical components that may require inspection or replacement if they show signs of wear or damage. It's also important to check the wiring within the cruise control circuit, as any damage can lead to operational failures. A worn-out control switch can further complicate matters, potentially causing the system to stop working altogether. Lastly, underlying engine or transmission problems can inadvertently affect cruise control performance, so ensuring these systems are functioning correctly is essential. By systematically addressing these areas, DIY enthusiasts can effectively diagnose and resolve cruise control issues in their SL55 AMG.

Why is the Cruise Control Not Working in a Mercedes-Benz SL55 AMG?

When your Mercedes-Benz SL55 AMG's cruise control fails, it’s crucial to address the problem promptly, as neglecting it can lead to safety risks and further vehicle damage. Common culprits include a defective brake pedal switch, which can prevent the system from engaging, or a blown fuse that disrupts electrical connections. Additionally, issues with the throttle control system or the ABS can also hinder cruise control functionality. In older models, a broken vacuum line may be the source of the malfunction. Furthermore, a faulty ABS wheel speed sensor or an ESP error can automatically disable cruise control, often linked to problems with the brake light switch or wheel speed sensors. Given the complexity of these systems, it is advisable to seek professional inspection and repair to ensure your vehicle remains safe and reliable on the road. Addressing these issues not only enhances your driving experience but also prevents potential accidents and costly repairs down the line.

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