BMW 750Li Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your BMW 750Li and How to Fix Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a BMW 750Li 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 750Li 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 750Li

When troubleshooting cruise control issues in a BMW 750Li, it's crucial to adopt a methodical diagnostic approach. Start by checking the simplest potential causes, such as a blown fuse. Locate the cruise control fuse in the vehicle's fuse box and inspect it for any signs of damage; replacing a blown fuse is a straightforward fix that can often resolve the issue. Next, assess the vehicle's battery condition, as a weak battery can disrupt the cruise control system's functionality. If these initial checks do not yield results, turn your attention to the speed sensor, which may require cleaning or replacement if it is dirty. Additionally, inspect the wiring for any loose connections or damage that could hinder the system's operation. The throttle control is another critical component; ensure it is clean and undamaged, as issues here can directly affect cruise control performance. Lastly, if the cruise control engages and disengages unexpectedly, examine the actuator for broken teeth on the plastic gears. By following this structured approach, you can effectively diagnose and address the underlying issues affecting your BMW 750Li's cruise control system.

What Could Cause the Cruise Control to Malfunction in a BMW 750Li?

When dealing with a malfunctioning cruise control system in a BMW 750Li, it's essential to understand the common problems that could be causing the issue. One of the primary culprits is a failed control module, which is responsible for processing signals from various components. Additionally, sensors play a crucial role; for instance, dirty or malfunctioning speed sensors can disrupt the communication between the vehicle's computer and the cruise control system, leading to operational failures. Furthermore, if the vehicle's system detects any conditions that make it unsafe to engage cruise control, it may trigger a warning, preventing activation. To effectively diagnose the problem, start by inspecting the control module, checking for any error codes, and cleaning or replacing any faulty sensors. By systematically addressing these areas, you can identify the root cause of the malfunction and restore your cruise control functionality.

Why is it Urgent to Fix the Cruise Control in a BMW 750Li?

Fixing the cruise control in a BMW 750Li is not just a matter of convenience; it is a critical safety concern that demands immediate attention. A malfunctioning cruise control system can lead to erratic speed changes, posing significant risks, especially during highway driving where maintaining a consistent speed is essential for safe navigation. Additionally, the comfort of long drives is compromised when the driver must constantly adjust the accelerator, leading to fatigue and distraction. Ignoring these symptoms can escalate into more severe issues, potentially damaging the vehicle's control module or sensors, which could result in costly repairs. Furthermore, a properly functioning cruise control system plays a vital role in optimizing fuel efficiency by preventing unnecessary acceleration and deceleration, ultimately benefiting both your wallet and the environment. Delaying repairs can lead to increased emissions and further mechanical complications, making it imperative to address cruise control issues promptly to ensure safety, comfort, and vehicle performance.

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