2005 Mercedes-Benz SL500 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2005 Mercedes-Benz SL500

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2005 Mercedes-Benz SL500 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 2005 Mercedes-Benz SL500 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 are the steps to diagnose the non-functioning cruise control in a 2005 Mercedes-Benz SL500?

To effectively diagnose the non-functioning cruise control in your 2005 Mercedes-Benz SL500, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by ensuring that the cruise control system is activated and that your vehicle is traveling at a speed suitable for cruise control engagement. Next, inspect the dashboard for the cruise control indicator light to confirm it is operational. If these basics check out, proceed to examine the fuse box for any blown fuses associated with the cruise control system, replacing any that are faulty. Following this, locate the cruise control module and inspect it for visible damage or signs of malfunction. Utilizing a diagnostic scanner can help you identify any error codes that may provide insight into the issue. Additionally, test the cruise control buttons on the steering wheel and check the brake pedal switch to ensure they are functioning correctly, as these components can affect the system's operation. If these steps do not resolve the problem, it may be prudent to consult a qualified mechanic for a more thorough diagnosis. By following this structured approach, you can efficiently identify the root cause of the cruise control malfunction and take appropriate action.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz SL500?

When the cruise control in your 2005 Mercedes-Benz SL500 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to detect when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system, as it relies on accurate speed readings to maintain control. Another potential problem is vacuum leaks within the cruise control system, which can interfere with its operation. A defective cruise control module may also be responsible for the malfunction, as it is essential for the system's overall functionality. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the cruise control's performance. By systematically checking these components, you can identify and resolve the issues affecting your cruise control system, allowing you to enjoy a smoother driving experience once again.

How urgent is it to repair the non-functioning cruise control on a 2005 Mercedes-Benz SL500?

When evaluating the urgency of repairing the non-functioning cruise control on a 2005 Mercedes-Benz SL500, it is essential to recognize that while this issue may not pose an immediate safety threat like brake failure, it still warrants prompt attention. A malfunctioning cruise control system can lead to erratic speed changes, which may compromise driving safety, particularly on long stretches of highway where consistent speed is crucial. Additionally, the comfort and convenience that cruise control provides can significantly enhance the driving experience, reducing fatigue during extended trips. Furthermore, addressing this repair in a timely manner can help preserve the vehicle's resale value, as potential buyers often shy away from cars with unresolved mechanical issues. Therefore, while it may not be an emergency, prioritizing the repair of the cruise control system is advisable to ensure a safe, comfortable, and valuable driving experience.

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2005 Mercedes-Benz SL500 Cruise Control Issues & Fix Costs