2010 Mercedes-Benz R350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2010 Mercedes-Benz R350 and How to Fix Them

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Reviewed by
Bo Fader
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 2010 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 2010 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 steps to diagnose the non-functioning cruise control in a 2010 Mercedes-Benz R350?

To effectively diagnose the non-functioning cruise control in your 2010 Mercedes-Benz R350, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can hinder engagement. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying electronic issues. Following this, inspect the speed sensors, as they play a crucial role in maintaining speed; any malfunction here can disrupt the cruise control system. Additionally, verify that the brake and clutch switches are functioning correctly, since these switches are designed to disable cruise control for safety reasons. It’s also important to check the wiring and connections associated with the cruise control system for any signs of damage or loose connections. Finally, if all else checks out, test the cruise control module itself, as a defective module may be the root cause of the problem. By following this structured diagnostic approach, you can efficiently identify and resolve the issue with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2010 Mercedes-Benz R350?

When troubleshooting cruise control issues in a 2010 Mercedes-Benz R350, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it incorrectly signals that the brake pedal is pressed. Additionally, a malfunctioning speed sensor can disrupt the system's ability to maintain a steady speed, causing it to disengage unexpectedly. Another potential issue is a blown fuse within the cruise control system, which can halt its operation entirely and requires a simple fuse replacement to fix. Furthermore, if the throttle actuator is not functioning correctly, it can hinder the system's ability to adjust the vehicle's speed, leading to cruise control malfunctions. Lastly, problems with the cruise control module itself, such as electrical failures or internal issues, can also result in the system not working as intended. By identifying and addressing these common problems, you can effectively troubleshoot and restore the cruise control functionality in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2010 Mercedes-Benz R350?

Addressing a non-functioning cruise control in a 2010 Mercedes-Benz R350 should be considered a priority, as neglecting this issue can lead to significant safety risks and potential damage to the vehicle's electronic systems. Cruise control is not just a luxury; it plays a crucial role in maintaining a steady speed, which is especially beneficial during long drives. A malfunctioning system may indicate deeper problems within the vehicle's electronics or sensors, which could compromise other critical functions. Moreover, ignoring the cruise control issue can increase driver fatigue on extended trips, as the driver may have to constantly monitor and adjust their speed manually. Therefore, it is advisable to have the cruise control system diagnosed and repaired by a qualified mechanic promptly. This proactive approach not only ensures the vehicle operates safely and efficiently but also helps prevent more costly repairs down the line, making it a wise decision for any DIY enthusiast or vehicle owner.

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