2018 BMW 640i Gran Coupe Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2018 BMW 640i Gran Coupe

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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 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 2018 BMW 640i 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.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2018 BMW 640i Gran Coupe?

When faced with a non-functioning cruise control in your 2018 BMW 640i Gran Coupe, start by checking the cruise control fuse to ensure it is intact, as a blown fuse can easily disrupt the system. Next, verify that the cruise control settings are correctly configured on your dashboard or steering wheel controls, as incorrect settings can prevent activation. Utilizing a diagnostic scanner to check for any error codes related to the cruise control system is also crucial, as these codes can provide insight into underlying issues. Additionally, inspect the cruise control buttons on the steering wheel for any signs of physical damage or malfunction, which could hinder operation. Finally, while driving, attempt to engage the cruise control system to see if it responds; this practical test can help you determine if the issue lies in the engagement mechanism. By following these steps, you can systematically diagnose and potentially resolve the cruise control problem in your BMW.

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

When troubleshooting the cruise control system in a 2018 BMW 640i Gran Coupe, it's essential to understand the common problems that may lead to its malfunction. One of the primary culprits is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing the cruise control from engaging or maintaining speed. Additionally, issues with the brake light switch can pose significant challenges; since the cruise control is designed to disengage when the brake pedal is pressed, a malfunctioning switch may either prevent activation or cause unexpected disengagement. Another critical component to consider is the throttle actuator, which regulates the engine's throttle opening. If this actuator is malfunctioning, it can lead to erratic behavior or complete failure of the cruise control system. Electrical problems, such as blown fuses or wiring faults, can also disrupt the cruise control's operation, making it vital to inspect the associated electrical components. Lastly, vacuum leaks within the engine can affect the cruise control's performance by hindering the engine's ability to maintain a steady speed. By systematically addressing these potential issues, owners can effectively troubleshoot and resolve the problems affecting their cruise control system.

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

When it comes to a non-functioning cruise control in your 2018 BMW 640i Gran Coupe, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potential damage to your vehicle. Cruise control is designed to enhance your driving experience by maintaining a consistent speed, which not only reduces driver fatigue during long journeys but also contributes to better fuel efficiency. However, if this feature is malfunctioning, it could signal deeper issues within your vehicle's systems, such as problems with the throttle or electronic controls. Ignoring these symptoms may result in more severe complications down the line, including costly repairs or even dangerous driving situations. Therefore, it is advisable to investigate the cause of the malfunction promptly. For DIY enthusiasts, this could involve checking the cruise control switch, inspecting fuses, or examining the vehicle's onboard diagnostics for error codes. By taking proactive steps to address the issue, you can ensure the safe and efficient operation of your BMW, ultimately enhancing your driving experience.

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