2015 Fiat 500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Fiat 500 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 2015 Fiat 500 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 2015 Fiat 500 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 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.

What basic steps should I take to diagnose cruise control issues in a 2015 Fiat 500?

When diagnosing cruise control issues in a 2015 Fiat 500, it's essential to adopt a systematic approach that begins with the simplest potential problems. Start by checking for blown fuses, as these are often the primary reason for cruise control malfunctions. Locate the fuse box and inspect any fuses associated with the cruise control system; a blown fuse can interrupt power to critical components like the cruise control switch and the Vehicle Speed Sensor (VSS). Next, examine the brake lights, since they are typically linked to the cruise control circuit. Have someone press the brake pedal while you verify that all brake lights are functioning correctly, as a malfunctioning brake light can inadvertently disable the cruise control system. By following these initial diagnostic steps, you can effectively narrow down the potential causes of the issue and determine whether further investigation or professional assistance is necessary.

What are the common problems that could cause the cruise control to stop working in a 2015 Fiat 500?

When the cruise control in a 2015 Fiat 500 ceases to function, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the first things to check is the fuse; a blown fuse is often the simplest and most frequent cause of cruise control failure. If the fuse is intact, the next step is to inspect the brake pedal switch, as a defective switch can prevent the cruise control from engaging. Additionally, issues within the throttle control system may disrupt the cruise control's operation, so examining this system is crucial. It's also important to consider the Anti-lock Braking System (ABS), as any malfunctions here can impact cruise control functionality. Lastly, in older models, a broken vacuum line could be a culprit, although this is less common in newer vehicles. By systematically checking these components, you can identify the root cause of the cruise control issue and take the necessary steps to restore its functionality.

How urgent is it to address the malfunctioning cruise control in a 2015 Fiat 500?

When dealing with a malfunctioning cruise control in a 2015 Fiat 500, understanding the urgency of the situation is crucial for both safety and vehicle performance. If the cruise control disengages unexpectedly while driving, especially at highway speeds, it can pose a significant safety risk, potentially leading to loss of control or accidents. Additionally, symptoms such as diagnostic trouble codes like P1580 can indicate deeper issues that may affect fuel efficiency and overall engine performance. Ignoring these signs can lead to more severe problems down the line, including costly repairs or even engine damage. Therefore, it is essential to investigate and address any cruise control issues promptly to ensure a safe and efficient driving experience. Taking action sooner rather than later not only enhances your vehicle's performance but also safeguards your well-being on the road.

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