BMW M5 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your BMW M5 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 M5 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 M5 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.

When the throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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 M5

When troubleshooting cruise control issues in your BMW M5, it's crucial to adopt a systematic diagnostic approach. Begin by checking the simplest potential problems, such as a blown fuse, which can often be found in the vehicle's fuse box. If the fuse is intact, inspect the battery to ensure it is fully functional, as a weak battery can disrupt the cruise control system. Next, examine the speed sensor; a dirty or malfunctioning sensor can lead to operational failures, so cleaning or replacing it may be necessary. Additionally, inspect the wiring connected to the cruise control system for any signs of damage or loose connections. If these checks do not resolve the issue, consider the throttle control mechanism, as dirt or damage here can also impede functionality. Lastly, ensure that your tire sizes are consistent with the manufacturer's specifications, as discrepancies can affect the system's performance. By following this methodical approach, you can effectively identify and resolve cruise control problems in your BMW M5, ensuring a smoother driving experience.

What Could Cause Cruise Control Issues in a BMW M5?

When troubleshooting cruise control issues in a BMW M5, it's essential to recognize the common problems that may be affecting the system's performance. A malfunctioning control module, sensor, or switch is often at the heart of these issues, as these components are vital for the cruise control's operation. Additionally, throttle actuation problems, particularly those related to a faulty throttle position sensor, can lead to erratic engine behavior, such as excessive fuel consumption and black exhaust emissions. Discrepancies between engine RPM and wheel rotations can also cause the computer to disable cruise control, especially if there is a significant difference in the rotation rates of the front and rear wheels. Simple issues like blown fuses in the fuse box can disrupt functionality, making it crucial to check and replace any faulty fuses. Other potential culprits include battery problems, dirty speed sensors, wiring issues, and damaged throttle controls. By systematically diagnosing these common problems, you can effectively identify and resolve the underlying issues affecting your BMW M5's cruise control system.

Why is the Cruise Control Not Working in a BMW M5 and Why Should You Fix It Immediately?

When the cruise control in your BMW M5 malfunctions, it is essential to act swiftly to diagnose and resolve the issue. Ignoring symptoms such as warning messages or erratic behavior can lead to unsafe driving conditions, as the cruise control system is designed to enhance your driving experience by maintaining a steady speed. Common culprits behind these malfunctions include failed or dirty speed sensors, which play a critical role in the system's operation. If these sensors are not functioning correctly, they may fail to relay accurate information to the vehicle's computer, resulting in unreliable cruise control performance. This not only diminishes the convenience of this feature but can also distract you from focusing on the road, increasing the risk of accidents. By addressing cruise control problems promptly, you not only restore the functionality of this valuable feature but also ensure a safer driving experience, ultimately enhancing your satisfaction with the BMW M5.

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