BMW 135is Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your BMW 135is 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a BMW 135is 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.

Troubleshooting Cruise Control Issues in a BMW 135is

When troubleshooting cruise control issues in your BMW 135is, it's essential to adopt a systematic diagnostic approach. Begin by identifying the specific symptoms of the malfunction; for instance, if the cruise control light turns off when attempting to set a speed or if the system fails to maintain the set speed, these indicators can guide your next steps. Start with the simplest potential fixes, such as checking the fuse associated with the cruise control system, as a blown fuse is a common and easily rectifiable issue. If the fuse is intact, inspect the cruise control switch and wiring for any visible damage or disconnections. Should these initial checks not resolve the problem, consider consulting the vehicle's manual for further troubleshooting tips or error codes that may provide insight into more complex issues. Remember, while DIY fixes can be effective, safety is paramount; if the cruise control malfunction poses a risk while driving, it is advisable to seek professional assistance to ensure a thorough diagnosis and repair.

What Could Cause the Cruise Control to Malfunction in a BMW 135is?

When dealing with cruise control malfunctions in a BMW 135i, it's essential to recognize the common problems that may arise. One frequent issue is the failure of the control module, which can disrupt the entire cruise control system. Additionally, sensor failures, particularly with the throttle position sensor or speed sensors, can lead to erratic behavior, such as the engine overcompensating with fuel, resulting in black exhaust. Wiring issues and blown fuses are also culprits that can prevent the cruise control from functioning correctly. For those looking to troubleshoot, start by checking the condition of the brake pedal and throttle body, as well as inspecting fuses related to the cruise control system. Utilizing a diagnostic scanner can help identify specific error codes that point to underlying problems. Regular maintenance and thorough diagnostics are crucial for ensuring the cruise control system operates smoothly, allowing for a more enjoyable driving experience.

Why is the Cruise Control Not Working in a BMW 135is?

When the cruise control in your BMW 135is malfunctions, it’s crucial to address the issue without delay. Ignoring symptoms such as unresponsive controls or unexpected disengagement can lead to dangerous driving situations, especially if the system fails while in use. Common culprits like a faulty throttle position sensor or malfunctioning brake pedal switch can not only hinder your vehicle's performance but also pose significant safety risks. For instance, if the cruise control system mistakenly believes the brakes are engaged, it will prevent activation, leaving you without this essential driving aid. Additionally, dirty or failed speed sensors can disrupt the system's ability to function correctly, potentially leading to further mechanical complications. Given these risks, it’s advisable to conduct a thorough inspection or consult a professional to ensure your cruise control system is operating safely and effectively. Taking prompt action can help prevent more severe issues down the line, ensuring a safer driving experience.

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