2012 Mercedes-Benz R350 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2012 Mercedes-Benz R350

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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 2012 Mercedes-Benz R350 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 2012 Mercedes-Benz R350 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 2012 Mercedes-Benz R350?

When faced with a non-functional cruise control in a 2012 Mercedes-Benz R350, it's crucial to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, verify the functionality of the cruise control switch; a malfunctioning switch may prevent the system from engaging. It's also important to inspect the speed sensors, which relay vehicle speed information to the cruise control system; any issues here can lead to operational failures. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying problems that may not be immediately visible. Additionally, ensure that the brake and clutch switches are functioning correctly, as these components are designed to disengage the cruise control when necessary. Finally, examine the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as faulty wiring can significantly impact performance. By following these steps, you can effectively diagnose and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2012 Mercedes-Benz R350?

When the cruise control in your 2012 Mercedes-Benz R350 ceases to function, it can be frustrating, but understanding the common problems can guide you in diagnosing the issue. One frequent culprit is a faulty brake light switch, which may fail to signal the cruise control system when the brake pedal is pressed, thereby preventing engagement. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a steady speed, leading to operational failures. Another potential problem is vacuum leaks within the cruise control system, which can hinder its performance. 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 operation. By systematically checking these components, you can identify and address the underlying issues, restoring your vehicle's cruise control functionality.

How urgent is it to address the non-functioning cruise control in a 2012 Mercedes-Benz R350?

Addressing a non-functioning cruise control in a 2012 Mercedes-Benz R350 is crucial for both safety and vehicle performance. When cruise control fails, it not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper electronic or sensor issues that could compromise the vehicle's overall functionality. Ignoring this problem can lead to more severe complications, potentially escalating repair costs and affecting other systems within the car. Moreover, a malfunctioning cruise control can detract from the driving experience, particularly on highways where this feature is most beneficial. Therefore, it is essential for DIY enthusiasts to prioritize the inspection and repair of the cruise control system to ensure safe and efficient vehicle operation. Taking prompt action can prevent further damage and enhance the driving experience, making it a wise decision for any car owner.

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