2018 BMW 640i Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 BMW 640i and How to Fix Them

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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 2018 BMW 640i 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 2018 BMW 640i 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-functioning cruise control in a 2018 BMW 640i?

When faced with a non-functioning cruise control in your 2018 BMW 640i, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown fuse can often be the simplest explanation for the malfunction. Next, verify that the cruise control settings are correctly configured on your dashboard or steering wheel controls, as incorrect settings can prevent the system from engaging. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues, guiding you toward the specific problem. Additionally, inspect the cruise control buttons on the steering wheel for any signs of physical damage or wear, as these can hinder functionality. Finally, conduct a test drive to see if the cruise control engages at all, which will help you determine whether the issue lies within the system itself or with a particular component. By following these steps, you can effectively narrow down the potential causes of the cruise control malfunction and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2018 BMW 640i?

When troubleshooting the cruise control system in a 2018 BMW 640i, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, the brake light switch plays a crucial role; if it malfunctions, the cruise control may disengage unexpectedly, as it is designed to do when the brake pedal is pressed. Another potential culprit is the throttle actuator, which regulates the engine's throttle opening; any issues here can hinder the cruise control's performance. Furthermore, a defective cruise control module can interfere with communication between system components, leading to operational failures. Lastly, electrical problems such as wiring issues or blown fuses can also impede the cruise control system's functionality. By identifying and addressing these common issues, DIY enthusiasts can effectively restore the cruise control functionality in their BMW 640i.

How urgent is it to address the non-functioning cruise control in my 2018 BMW 640i?

When your 2018 BMW 640i's cruise control stops working, it’s essential to recognize the urgency of the situation. While it may not seem like an immediate emergency, neglecting this issue can lead to more significant problems down the line. A malfunctioning cruise control system can indicate underlying electronic or sensor issues that may affect other critical vehicle functions, potentially compromising your safety on the road. Moreover, if left unaddressed, these problems could escalate, resulting in costly repairs or even dangerous driving conditions. Therefore, it is advisable to inspect the cruise control system promptly. For DIY enthusiasts, this could involve checking the fuses, examining the brake pedal switch, or ensuring that the vehicle's software is up to date. Taking these steps not only helps restore the cruise control functionality but also contributes to the overall performance and safety of your vehicle. Prioritizing this repair can enhance your driving experience and prevent further complications.

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