BMW 650i Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your BMW 650i 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a BMW 650i 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 650i 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 650i

When troubleshooting cruise control issues in your BMW 650i, it's essential to adopt a systematic diagnostic approach. Begin by identifying the symptoms of the malfunction, as this will guide your troubleshooting process. Start with the simplest potential issues, such as checking for a blown fuse in the vehicle's fuse box, as this is a quick and easy fix that can often resolve the problem. Next, inspect the battery to ensure it is functioning properly, since battery issues can impact the cruise control system. If these initial checks do not resolve the issue, move on to examining the speed sensor, which can accumulate dirt and debris, leading to malfunctions. Cleaning or replacing a dirty speed sensor can restore functionality. Additionally, inspect the wiring for any signs of damage or looseness, as faulty wiring can disrupt the cruise control system. Don't overlook the throttle control; a dirty or damaged throttle can also cause problems, so ensure it is clean and in good working order. For more advanced diagnostics, consider testing the ABS control module and wheel speed sensors with a multimeter to check for any electrical issues. By following this structured approach, you can effectively diagnose and address cruise control problems, ensuring a safer and more reliable driving experience.

What Could Cause the Cruise Control to Malfunction in a BMW 650i?

When dealing with a malfunctioning cruise control system in a BMW 650i, it's essential to understand the common problems that may be at play. One of the primary culprits is often a failed control module, which can disrupt the entire system's functionality. Additionally, issues with sensors or switches can lead to erratic behavior or complete failure of the cruise control feature. Throttle actuation problems are another frequent cause, as they can prevent the system from maintaining the desired speed. Other potential issues include a blown fuse, which can cut power to the cruise control system, or battery problems that affect overall vehicle performance. A dirty speed sensor can also hinder accurate speed readings, while wiring problems may create communication issues between the Electronic Control Module (ECM) and the electronic throttle. To effectively troubleshoot and resolve these issues, it's crucial to conduct a thorough diagnosis, ensuring that each component is checked for faults to restore the cruise control system to its optimal working condition.

Why is the Cruise Control Not Working in a BMW 650i?

When your BMW 650i's cruise control is not functioning, it is essential to act quickly to prevent safety hazards while driving. The issue may stem from several factors, including dirty or malfunctioning sensors, particularly speed sensors, which are vital for the cruise control system's operation. Additionally, problems with the control module, throttle actuation, or the cruise control switch can disrupt functionality. It's important to remember that the cruise control may not activate until the engine reaches a certain temperature, typically around 10 minutes of driving. If the actuator or clutch is stuck, this could complicate matters further, requiring thorough troubleshooting. Neglecting these symptoms can lead to not only unsafe driving conditions but also more severe mechanical problems in the future. Therefore, if simple fixes do not restore functionality, consulting a qualified mechanic or a BMW dealership is recommended for a comprehensive diagnosis and repair.

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