2021 Ford Mustang Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Ford Mustang

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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 2021 Ford Mustang 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 2021 Ford Mustang 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 are the steps to diagnose the cruise control issue in a 2021 Ford Mustang?

To effectively diagnose a cruise control issue in your 2021 Ford Mustang, begin with the simplest solutions. Start by checking the cruise control fuse to ensure it is intact, as a blown fuse can easily disrupt the system. Next, inspect the cruise control buttons on your steering wheel for any signs of damage or malfunction, as these controls are essential for operation. If these initial checks do not reveal the problem, utilize an OBD-II scanner to identify any error codes that may indicate specific issues within the cruise control system. Following this, examine the speed sensors, which are critical for the cruise control's functionality, ensuring they are operating correctly. Additionally, inspect the wiring connections associated with the cruise control system for any loose or corroded wires that could be causing a disruption. If all else fails, test the cruise control module itself to determine if it is functioning properly or requires replacement. Should the issue persist after these steps, it may be prudent to consult a professional mechanic who specializes in Ford vehicles for further assistance. By following this structured diagnostic approach, you can efficiently troubleshoot and potentially resolve cruise control issues in your Mustang.

What are the common problems that could cause the cruise control to stop working in a 2021 Ford Mustang?

When troubleshooting the cruise control system in a 2021 Ford Mustang, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake pedal switch, which is crucial for disengaging the cruise control when the brake is applied. If this switch malfunctions, it can prevent the system from engaging properly. Additionally, issues with the speed sensor can result in inaccurate speed readings, causing the cruise control to disengage unexpectedly or fail to activate altogether. Another potential issue is a blown fuse within the cruise control system, which can disrupt its functionality entirely. Furthermore, a defective cruise control module can hinder the system's ability to operate correctly, affecting its engagement and speed maintenance. Lastly, problems with the throttle control system, such as a malfunctioning throttle position sensor, can also impact the cruise control's performance. For those looking to DIY, it's advisable to check these components systematically to identify and resolve the issue effectively.

How urgent is it to address the malfunctioning cruise control in a 2021 Ford Mustang?

When dealing with a malfunctioning cruise control in a 2021 Ford Mustang, it's essential to recognize that while this issue may not pose an immediate safety risk like brake or airbag failures, it still warrants prompt attention. Neglecting to address cruise control problems can lead to frustrating driving experiences, particularly on long trips where maintaining a constant speed is beneficial. Moreover, if left unchecked, the underlying issues could escalate, potentially causing further wear on the vehicle's components or leading to more significant malfunctions down the line. Therefore, while the urgency may not be as high as with critical safety systems, timely repairs are crucial for preserving the overall functionality and enjoyment of your Mustang. Taking proactive steps to diagnose and fix cruise control issues can enhance your driving experience and prevent more costly repairs in the future.

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