2003 Mercedes-Benz SL55 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2003 Mercedes-Benz SL55 AMG

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Reviewed by
Devin Cabugcal
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 2003 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 2003 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.

What are the steps to diagnose the cruise control issue in a 2003 Mercedes-Benz SL55 AMG?

When diagnosing a cruise control issue in a 2003 Mercedes-Benz SL55 AMG, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. If the fuse is intact, proceed to examine the cruise control switch on the steering wheel, since a malfunctioning switch is a common source of problems. Should these initial steps not yield results, utilize a diagnostic scanner to retrieve any error codes from the vehicle's onboard computer, which can help pinpoint specific issues. Additionally, check the speed sensors, as they are vital for the cruise control's operation. It's also wise to inspect the wiring and connections related to the cruise control system for any signs of damage or corrosion, as these can lead to malfunctions. Finally, if all previous checks are clear, test the cruise control module to ensure it is functioning properly. By adhering to this structured diagnostic process, you can effectively troubleshoot and resolve cruise control issues in your SL55 AMG.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz SL55 AMG?

When dealing with cruise control issues in a 2003 Mercedes-Benz SL55 AMG, it's essential to understand the common problems that may arise. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal that the brake pedal is not pressed. Additionally, speed sensor issues can disrupt the system, as accurate speed readings are crucial for cruise control functionality. 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 plays a vital role in the system's overall performance. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the cruise control's ability to function correctly. By identifying and addressing these common issues, DIY enthusiasts can effectively troubleshoot and restore the cruise control system in their SL55 AMG.

How urgent is it to address the non-functioning cruise control in a 2003 Mercedes-Benz SL55 AMG?

Addressing the non-functioning cruise control in a 2003 Mercedes-Benz SL55 AMG is an urgent matter that should not be overlooked. Neglecting this issue can lead to increased driver fatigue, especially during long drives, which significantly raises the risk of accidents. Furthermore, a malfunctioning cruise control system can indicate underlying electrical or mechanical problems that, if left unaddressed, could escalate into more severe and costly repairs. The comfort of your driving experience is also compromised, as the convenience of maintaining a steady speed is lost, making long trips less enjoyable. Additionally, for those considering resale, a fully functional cruise control system is a key feature that potential buyers look for, and its absence could diminish the vehicle's value. Therefore, it is crucial to prioritize the repair of the cruise control system to ensure safety, enhance comfort, and protect the investment in your vehicle.

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