2003 Mercedes-Benz S600 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Mercedes-Benz S600 and How to Fix Them

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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 2003 Mercedes-Benz S600 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 S600 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 2003 Mercedes-Benz S600?

To effectively diagnose the non-functioning cruise control in a 2003 Mercedes-Benz S600, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse is a common and easily fixable issue that can halt the system's operation. Next, examine the cruise control buttons on the steering wheel to ensure they are responsive; faulty buttons can prevent engagement. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide insights into specific malfunctions. Following this, assess the speed sensors, as they are integral to the cruise control's functionality; any faults here can disrupt the system. Additionally, check the brake and clutch switches, since malfunctioning switches can inhibit cruise control activation. Finally, if all else appears functional, test the cruise control module itself to confirm it is sending the correct signals. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz S600?

When dealing with a malfunctioning cruise control system in a 2003 Mercedes-Benz S600, it's essential to understand the common problems that could be at play. 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's ability to maintain speed, as it relies on accurate readings to function correctly. Another potential issue 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 a critical component of the system. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the functionality of the cruise control. By identifying and addressing these common problems, DIYers can effectively troubleshoot and resolve issues with the cruise control in their Mercedes-Benz S600.

How urgent is it to repair the non-functioning cruise control in a 2003 Mercedes-Benz S600?

When evaluating the urgency of repairing the non-functioning cruise control in a 2003 Mercedes-Benz S600, it's essential to understand that while this feature enhances driving comfort, its failure does not compromise the vehicle's basic operation or safety. The cruise control system is designed to assist drivers during long journeys by maintaining a consistent speed, which can reduce fatigue. However, the absence of this feature does not pose an immediate risk to the driver or others on the road. Therefore, while it is advisable to address the issue to restore convenience and comfort, it is not classified as an urgent repair. Drivers should consider their personal driving habits and the frequency of long trips when deciding on the timing of the repair. If the lack of cruise control significantly impacts the driving experience, it may warrant prompt attention, but for most drivers, it can be scheduled at their convenience without concern for safety or vehicle integrity.

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