2007 Mercedes-Benz R320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2007 Mercedes-Benz R320 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 2007 Mercedes-Benz R320 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 2007 Mercedes-Benz R320 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 2007 Mercedes-Benz R320?

When faced with a non-functional cruise control in your 2007 Mercedes-Benz R320, it's crucial to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can often be the simplest fix. Next, inspect the cruise control switch located on the steering wheel for any signs of damage or malfunction, as this component is vital for operation. Ensure that the cruise control system is enabled through the vehicle's settings, as sometimes it may inadvertently be turned off. Additionally, examine the vehicle's speed sensors, which play a critical role in providing accurate data to the cruise control system; any malfunction here can disrupt functionality. Finally, utilize an onboard diagnostic scanner to check for error codes related to the cruise control system, as this can help pinpoint more complex issues. By following these steps, you can effectively narrow down the potential causes of the problem and take appropriate action to restore your cruise control functionality.

What are the common problems that could cause the cruise control to stop working in a 2007 Mercedes-Benz R320?

When troubleshooting the cruise control system in a 2007 Mercedes-Benz R320, 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 system from engaging if it fails to detect when the brake pedal is pressed. Additionally, issues with the speed sensor can result in inaccurate speed readings, causing the cruise control to malfunction or disengage unexpectedly. Another potential issue is vacuum leaks within the system, which can disrupt its ability to maintain a constant speed. Furthermore, a defective cruise control module may lead to a complete lack of response from the system, while electrical problems, such as blown fuses or wiring issues, can also hinder its operation. By identifying and addressing these common problems, you can effectively troubleshoot and restore functionality to the cruise control system in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2007 Mercedes-Benz R320?

When it comes to the non-functioning cruise control in a 2007 Mercedes-Benz R320, understanding the urgency of the situation is crucial for any DIY enthusiast. While the malfunction may not pose an immediate safety risk like failing brakes or steering, it is still important to address the issue promptly. A functioning cruise control system enhances driving comfort, particularly on long trips, by allowing the driver to maintain a steady speed and reduce fatigue. Ignoring this problem could lead to inconvenience during highway driving, where cruise control is most beneficial. Moreover, delaying repairs might result in further complications within the cruise control system, potentially escalating repair costs down the line. Therefore, while it may not be the highest priority compared to other mechanical issues, taking the time to diagnose and fix the cruise control will ensure the vehicle operates smoothly and efficiently, ultimately enhancing the overall driving experience.

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