2012 Mercedes-Benz ML350 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2012 Mercedes-Benz ML350

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Reviewed by
Devin Cabugcal
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 ML350 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 ML350 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 ML350?

To effectively troubleshoot the non-functional cruise control in your 2012 Mercedes-Benz ML350, start with a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the fuses associated with the cruise control system, as a blown fuse can easily disrupt its operation. Next, evaluate the brake pedal and its switch; a malfunction here is a common culprit for cruise control failures, as the system often relies on the brake pedal's status to engage or disengage. Following this, examine the throttle body to ensure it is operating correctly, since any issues here can directly affect the cruise control's functionality. Lastly, check the spiral cable within the steering wheel, as a damaged cable can hinder communication between the cruise control switch and the vehicle's systems. By methodically addressing these areas, you can identify and resolve the underlying 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 ML350?

When troubleshooting the cruise control system in a 2012 Mercedes-Benz ML350, 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 disrupt the system's ability to engage by failing to signal when the brake pedal is pressed. Additionally, issues with the speed sensor can prevent the cruise control from maintaining a steady speed, as it relies on accurate speed readings to function correctly. Another potential issue is vacuum leaks within the engine, which can compromise the vacuum pressure necessary for the cruise control to operate effectively. Furthermore, a defective cruise control module may result in the system not engaging at all, while electrical problems, such as blown fuses or damaged wiring, can also hinder its performance. By identifying and addressing these common issues, you can restore the cruise control functionality in your vehicle, ensuring a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in a 2012 Mercedes-Benz ML350?

Addressing a malfunctioning cruise control in a 2012 Mercedes-Benz ML350 is of utmost importance due to the immediate safety risks it poses. A faulty system can lead to unexpected acceleration or deceleration, which can be dangerous while driving. Additionally, ignoring these symptoms may not only compromise your safety but can also result in decreased fuel efficiency and further damage to the vehicle's components. By taking prompt action, you can avoid more costly repairs down the line and ensure that your vehicle operates smoothly and safely. Therefore, it is crucial to prioritize the repair of your cruise control system to maintain both your safety and the overall performance of your vehicle.

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2012 Mercedes-Benz ML350 Cruise Control Issues & Repairs