2021 Chevrolet Blazer Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2021 Chevrolet Blazer and How to Fix Them

Find Repair Location
Reviewed by
Aisha
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 Chevrolet Blazer 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 Chevrolet Blazer 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 initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2021 Chevrolet Blazer?

When troubleshooting the non-functioning cruise control in your 2021 Chevrolet Blazer, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse in the fuse box, as a blown fuse can often be the simplest issue to resolve. Next, ensure that the cruise control settings are correctly configured and activated; sometimes, the solution is as straightforward as adjusting the settings. If these initial checks do not resolve the issue, use an OBD-II scanner to look for any error codes that may indicate a deeper problem within the cruise control system. Additionally, inspect the cruise control buttons on the steering wheel to confirm they are functioning properly, as faulty buttons can prevent the system from engaging. Finally, examine the brake pedal switch, which is crucial for the cruise control's operation, as it disengages the system when the brake is pressed. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issue in your Blazer.

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

When troubleshooting cruise control issues in a 2021 Chevrolet Blazer, it's essential to understand the common problems that may be at play. One frequent culprit 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 disrupt the vehicle's ability to maintain a constant speed, leading to cruise control failure. Another potential problem is a blown fuse within the cruise control system; checking and replacing this fuse can often resolve the issue. Furthermore, a malfunctioning throttle actuator may hinder the cruise control's ability to regulate engine speed effectively. Lastly, problems with the Electronic Control Module (ECM), which oversees various vehicle functions including cruise control, can also result in system failure. By identifying and addressing these common issues, you can effectively troubleshoot and potentially restore the functionality of your cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2021 Chevrolet Blazer?

When dealing with a malfunctioning cruise control in a 2021 Chevrolet Blazer, it is crucial to recognize the urgency of the situation. Ignoring symptoms such as erratic speed changes or unresponsive controls can lead to serious safety risks, including unexpected acceleration or deceleration that may result in accidents. Additionally, a faulty cruise control system can detract from the overall driving experience, particularly during long journeys where maintaining a consistent speed is essential for comfort. Promptly addressing these issues not only enhances your safety on the road but also helps preserve the vehicle's performance and efficiency, ensuring it operates as designed. Therefore, if you notice any signs of malfunction, it is advisable to take action immediately to avoid potential hazards and maintain the integrity of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2021 Chevrolet Blazer Cruise Control Not Working | RepairPal