2017 Smart Fortwo Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Smart Fortwo and How to Fix Them

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Reviewed by
Andrew Hajjar
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 2017 Smart Fortwo 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 2017 Smart Fortwo 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2017 Smart Fortwo?

When troubleshooting the non-functional cruise control in a 2017 Smart Fortwo, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's operation. Next, examine the cruise control switch to ensure it is functioning correctly; a faulty switch may prevent the system from engaging. It's also crucial to inspect the brake pedal switch, since the cruise control is designed to disengage when the brake is applied. If this switch is stuck or malfunctioning, it could lead to issues. Additionally, using a diagnostic tool to scan for error codes can provide insights into any underlying problems affecting the cruise control system. Lastly, don't overlook the vehicle speed sensor, as it plays a vital role in maintaining a constant speed; a malfunctioning sensor can lead to cruise control failure. By following these steps, you can effectively identify and address the cause of the cruise control malfunction in your Smart Fortwo.

What are the common problems that could cause the cruise control to stop working in a 2017 Smart Fortwo?

When the cruise control in a 2017 Smart Fortwo ceases to function, several common problems may be at play. 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 it from engaging or maintaining the desired speed. Additionally, a defective cruise control switch can impede communication between the driver and the cruise control system, leading to operational failures. Electrical issues, such as a blown fuse, can also interrupt the circuit that powers the cruise control, causing it to stop working altogether. Furthermore, vacuum leaks in the engine can affect the system's performance, as cruise control relies on vacuum pressure to regulate speed effectively. Lastly, issues with the brake light switch can prevent the cruise control from engaging, as this switch is designed to deactivate the system when the brakes are applied. Understanding these common problems can help DIYers troubleshoot and potentially resolve cruise control issues in their Smart Fortwo.

How urgent is it to address the malfunctioning cruise control in a 2017 Smart Fortwo?

When dealing with a malfunctioning cruise control in a 2017 Smart Fortwo, it's essential to understand the urgency of the situation. While this issue may not present an immediate safety risk like brake failure or engine problems, neglecting it can lead to a decline in overall vehicle performance and driver comfort. Cruise control is designed to enhance the driving experience, especially on long trips, and a malfunction can detract from that convenience. Timely attention to this issue is crucial; if left unresolved, it could potentially escalate into more significant problems that may require costly repairs. Therefore, while the urgency may not be as high as other critical vehicle issues, addressing the malfunction promptly is advisable to ensure the vehicle operates optimally and to maintain a comfortable driving experience. Consulting a qualified mechanic or authorized service center for a thorough diagnosis and repair is the best course of action to restore the functionality of your cruise control system.

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2017 Smart Fortwo Cruise Control Issues & Repair Options