2021 Cadillac CT4 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Cadillac CT4

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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 Cadillac CT4 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 Cadillac CT4 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 Cadillac CT4?

When diagnosing a cruise control issue in a 2021 Cadillac CT4, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel for any signs of sticking or malfunction, which could prevent proper operation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying electronic issues. Additionally, ensure that the speed sensors are functioning correctly, as faulty sensors can significantly impact cruise control performance. Testing the cruise control module is also crucial, as it must send accurate signals to the throttle system. Finally, examine the wiring and connections for any damage or corrosion that could hinder the system's operation. If these steps do not resolve the issue, seeking assistance from a professional mechanic with experience in Cadillac vehicles is advisable for a thorough diagnosis and repair. This methodical approach not only helps in identifying the problem efficiently but also saves time and resources in the troubleshooting process.

What are the common problems that could cause the cruise control to stop working in a 2021 Cadillac CT4?

When troubleshooting the cruise control system in a 2021 Cadillac CT4, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is faulty speed sensors, which are crucial for the system to accurately gauge the vehicle's speed. If these sensors malfunction, the cruise control may not engage or maintain speed effectively. Another frequent issue is related to the brake light switch; if this switch is defective, it can inadvertently signal the cruise control to deactivate whenever the brakes are applied, disrupting its functionality. Additionally, blown fuses can pose a significant problem, as they can cut off power to the cruise control system, rendering it inoperable until replaced. Throttle control malfunctions can also interfere with the system's ability to maintain a steady speed, while issues with the electronic control module, which oversees various vehicle functions, can lead to broader system failures. For those looking to DIY, it's advisable to start by checking these components, as addressing these common issues can often restore the cruise control functionality without the need for professional assistance.

How urgent is it to address the non-functioning cruise control in a 2021 Cadillac CT4?

Addressing the non-functioning cruise control in a 2021 Cadillac CT4 is crucial for maintaining both safety and vehicle performance. When cruise control fails, it not only diminishes the convenience of long-distance driving but may also signal deeper issues within the vehicle's systems. Ignoring this problem can lead to increased driver fatigue, especially on extended trips, as the driver may have to manually maintain speed, which can be tiring and distracting. Moreover, a malfunctioning cruise control could indicate potential safety hazards, such as erratic speed control, which can compromise the vehicle's handling and overall safety on the road. Therefore, it is essential to diagnose and repair any underlying issues promptly, as neglecting them could result in more significant damage and costly repairs down the line. Prioritizing the functionality of your cruise control ensures a safer and more efficient driving experience.

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2021 Cadillac CT4 Cruise Control Issues & Repair Costs