2003 GMC Sierra 1500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 GMC Sierra 1500 and How to Fix Them

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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 2003 GMC Sierra 1500 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 2003 GMC Sierra 1500 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2003 GMC Sierra 1500?

When troubleshooting the non-functional cruise control in a 2003 GMC Sierra 1500, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by examining the fuse associated with the cruise control system, as a blown fuse can often be the simplest explanation for the malfunction. Next, inspect the wiring for any signs of damage, corrosion, or loose connections that could disrupt the system's operation. Testing the cruise control switch for continuity is also crucial, as a faulty switch can prevent the system from engaging. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying electronic issues. If your vehicle's cruise control relies on vacuum, ensure that the vacuum lines are intact and free from leaks. Additionally, verify the functionality of the speed sensors, as they play a critical role in the system's performance. Lastly, don't overlook the brake lights; a malfunctioning brake light switch can inadvertently disable the cruise control. By following these steps, you can effectively narrow down the potential causes of the issue and take appropriate action to restore functionality.

What are the common problems that could cause the cruise control to stop working in a 2003 GMC Sierra 1500?

When troubleshooting the cruise control system in a 2003 GMC Sierra 1500, several common problems may be at play. One of the first things to check is the fuse associated with the cruise control; a blown fuse can easily disrupt the system's functionality. Additionally, the brake pedal switch is crucial, as it is designed to deactivate the cruise control when the brake is pressed; if this switch is faulty, it may prevent the system from engaging. Another potential issue could be related to the speed sensor, which is responsible for relaying the vehicle's speed to the cruise control system; any malfunction here can hinder the system's ability to maintain speed. Furthermore, the cruise control module itself may be defective, leading to operational failures. It's also important to inspect for vacuum leaks, as these can significantly impact the cruise control's performance. Lastly, don’t overlook the cruise control buttons on the steering wheel; if they are not functioning properly, they can prevent the system from responding. By systematically checking these components, you can effectively diagnose and address the cruise control issues in your GMC Sierra 1500.

How urgent is it to repair the non-functioning cruise control on a 2003 GMC Sierra 1500?

When it comes to the non-functioning cruise control on a 2003 GMC Sierra 1500, the urgency of repair may not seem critical at first glance, but it is important to recognize the potential consequences of inaction. While the absence of cruise control does not directly compromise the vehicle's safety, it can lead to increased driver fatigue during long trips, making the driving experience less enjoyable. Moreover, neglecting this issue could result in more significant problems down the line, especially if the malfunction stems from common culprits like faulty control modules or sensors. Addressing the repair promptly not only restores the convenience of maintaining a steady speed but also helps prevent further complications that could arise from a deteriorating system. Therefore, while it may not be an emergency, taking the time to fix the cruise control can enhance your driving comfort and ensure that the system functions properly when you need it most.

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