BMW M850i XDrive Gran Coupe Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your BMW M850i xDrive Gran Coupe 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 BMW M850i xDrive Gran Coupe 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 BMW M850i xDrive Gran Coupe 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

Troubleshooting Cruise Control Issues in a BMW M850i xDrive Gran Coupe

When troubleshooting cruise control issues in your BMW M850i xDrive Gran Coupe, it's essential to adopt a methodical diagnostic approach. Start by checking the simplest potential problems, such as inspecting the cruise control fuse in the fuse box; a blown fuse is a common culprit that can easily be replaced. Next, assess the condition of your vehicle's battery, as a weak battery can disrupt the cruise control system's functionality. If these initial checks do not resolve the issue, proceed to examine the speed sensor, ensuring it is clean and free of debris, as a dirty sensor can hinder performance. Additionally, inspect the wiring associated with the cruise control system for any loose connections or damage that could be causing the malfunction. Finally, take a close look at the throttle control mechanism, as dirt or damage here can also lead to problems. By following this structured approach, you can effectively diagnose and potentially resolve cruise control issues, ensuring a smoother driving experience. If the problem persists after these checks, seeking assistance from a professional mechanic or a BMW service center may be necessary for further evaluation.

What Could Cause Cruise Control Issues in a BMW M850i xDrive Gran Coupe?

When experiencing cruise control issues in your BMW M850i xDrive Gran Coupe, it's crucial to understand the common problems that may be at play. One of the primary culprits could be a malfunctioning control module, which is responsible for managing the cruise control system. Additionally, the sensor that monitors vehicle speed and other critical data may also fail, leading to erratic cruise control behavior. Problems with the throttle system can further complicate matters, as they directly affect the vehicle's ability to maintain speed. Electrical faults within the cruise control system are another potential source of trouble, often manifesting as intermittent failures. Lastly, a blown fuse is a straightforward issue that can be easily checked and replaced, making it a common DIY fix. By systematically addressing these potential causes, you can effectively diagnose and resolve cruise control issues, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a BMW M850i xDrive Gran Coupe?

When the cruise control system in your BMW M850i xDrive Gran Coupe fails, it is crucial to act promptly to avoid safety risks and further complications. The malfunction may stem from several issues, primarily involving the sensors that communicate vital information to the vehicle's computer. Dirty or failed speed sensors are common culprits that can disrupt the cruise control's functionality. If these sensors are not cleaned or replaced, the cruise control may not engage, leading to potential hazards while driving, especially on long trips where maintaining speed is essential for comfort and safety. Ignoring these symptoms can not only compromise your driving experience but may also lead to more significant mechanical problems down the line. Therefore, it is advisable to regularly check and maintain the sensors and components related to the cruise control system to ensure they are in optimal working condition, thereby enhancing both safety and performance.

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