Mercedes-Benz SL600 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz SL600 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 SL600 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 SL600 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 SL600

When troubleshooting cruise control issues in your Mercedes-Benz SL600, it's essential to adopt a methodical diagnostic approach. Start by checking the instrument cluster for any warning messages indicating that the cruise control is inoperative. This initial step can provide immediate insight into potential electronic issues. Next, inspect the fuses related to the cruise control system; a blown fuse can often be the simplest fix. Following this, examine the brake lights and brake switches, as faulty components here can disrupt the cruise control functionality. If these checks do not reveal the problem, delve deeper into the throttle control system, ABS, and the vacuum actuator. Look for any damaged vacuum lines or cables connecting the actuator to the throttle, as these can significantly impact performance. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issues without needing professional assistance. If all else fails, consulting a service and maintenance team may be necessary for more complex problems.

Troubleshooting Cruise Control Issues in a Mercedes-Benz SL600

When troubleshooting cruise control issues in your Mercedes-Benz SL600, it's essential to understand the common problems that may arise within the system. One frequent issue is a blown fuse, which can disrupt the power supply to critical components like the cruise control switch and the vehicle speed sensor. Inspecting the fuse box for any blown fuses related to the cruise control system is a vital first step. Additionally, a faulty spiral cable in the steering wheel can hinder communication between the control switch and the cruise control system, preventing it from activating. Electrical issues, such as damaged connectors or failing components, can also lead to malfunctions, so a thorough inspection of the vehicle's electrical system is necessary. Another common culprit is a defective brake pedal switch, which can interrupt the cruise control's operation. Furthermore, problems with the throttle control system can affect how the cruise control functions, as can issues with the Anti-lock Braking System (ABS). By systematically examining these components, you can effectively identify and address the underlying causes of cruise control problems in your SL600, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz SL600?

When the cruise control in your Mercedes-Benz SL600 is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and potentially exacerbate the problem. Common culprits include a defective brake pedal switch, which can prevent the system from engaging, or a dead battery that may disrupt electrical components. Additionally, a faulty ABS wheel speed sensor or issues within the throttle control system can also hinder cruise control performance. In older models, a broken vacuum line might be the source of the malfunction. Furthermore, an ESP error can disable cruise control, often triggered by problems with the brake light switch, wheel speed sensor, steering angle sensor, or yaw switch. Given the complexity of these systems, it is advisable to seek professional inspection and diagnosis to ensure a safe and effective resolution, as ignoring these symptoms could lead to more significant mechanical failures or unsafe driving conditions.

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Mercedes-Benz SL600 Cruise Control Issues & Repair Costs