2005 Mercedes-Benz S430 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Mercedes-Benz S430 and How to Fix Them

Find Repair Location
Reviewed by
Andrew Hajjar
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 S430 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 S430 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2005 Mercedes-Benz S430?

When faced with a non-functional cruise control in a 2005 Mercedes-Benz S430, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's operation. Next, inspect the cruise control switch located on the steering wheel; ensure it is responsive and functioning correctly. The brake pedal switch is another critical component to examine, as a malfunction here can prevent the cruise control from engaging altogether. Additionally, verify the vehicle speed sensor, which is vital for the cruise control system to operate effectively. Finally, consider scanning the vehicle's onboard computer for any error codes that may provide insight into the underlying issue. By following these steps, you can efficiently identify and address the factors contributing to the cruise control malfunction, making your DIY troubleshooting process more effective.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz S430?

When dealing with cruise control issues in a 2005 Mercedes-Benz S430, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal that the brakes are not applied. Additionally, a malfunctioning speed sensor can disrupt the system's ability to maintain the desired speed, leading to cruise control failure. Another potential issue is vacuum leaks within the engine, which can interfere with the cruise control's operation. Furthermore, a defective cruise control module may also be responsible for the system's inability to function correctly. Lastly, electrical problems, including faulty wiring or blown fuses, can significantly impact the cruise control system. By identifying and addressing these common issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2005 Mercedes-Benz S430?

When it comes to a non-functioning cruise control in a 2005 Mercedes-Benz S430, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potential damage to the vehicle's electronic systems. Cruise control is designed to enhance driving comfort and efficiency, particularly on long journeys, and its malfunction could indicate deeper issues with the vehicle's sensors or electronics. This not only compromises the convenience of maintaining a steady speed but could also affect other critical systems in the car. For DIY enthusiasts, it’s essential to recognize that timely diagnosis and repair can prevent further complications and ensure the vehicle remains safe and reliable on the road. Therefore, while you may be tempted to postpone repairs, addressing the cruise control issue promptly is a wise decision that contributes to both safety and vehicle performance.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.