GMC Sierra 2500 HD Classic Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your GMC Sierra 2500 HD Classic and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a GMC Sierra 2500 HD Classic 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 GMC Sierra 2500 HD Classic 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.

Troubleshooting Cruise Control Issues in a GMC Sierra 2500 HD Classic

When troubleshooting cruise control issues in your GMC Sierra 2500 HD Classic, it's essential to adopt a systematic diagnostic approach. Begin by inspecting the simplest components, such as the brake switch, which is often a common culprit for cruise control malfunctions. If the brake switch is misaligned or faulty, replacing it is a straightforward and cost-effective solution. Next, check the cruise control engagement switch; ensure it is functioning correctly and handle it with care to avoid any damage. If these initial checks do not resolve the issue, move on to examining the control module and associated sensors for signs of failure. Additionally, inspect the wiring connected to the steering column, as broken or damaged wires can disrupt the cruise control system. By following this methodical approach, starting with the easiest fixes and progressing to more complex diagnostics, you can effectively identify and resolve the issues affecting your cruise control system.

What Could Cause Cruise Control Malfunctions in a GMC Sierra 2500 HD Classic?

When diagnosing cruise control malfunctions in a GMC Sierra 2500 HD Classic, it's essential to consider a range of common problems that could be affecting the system. One frequent issue is a failed control module, sensor, or switch, which can disrupt the cruise control's functionality. Additionally, throttle actuation problems may prevent the system from maintaining speed as intended. Electrical issues, such as corroded connections at tail light pins, can also lead to intermittent cruise control failures. It's crucial to check the brake light switch, as misalignment or failure can directly impact the cruise control's operation. Furthermore, the engagement switch may become problematic if excessive force is applied during use. Other potential culprits include blown fuses, defective brake pedal switches, and issues with the throttle control system or ABS. By monitoring cruise control data for uncommanded disengagements, such as unexpected cancellations when pressing the brake or cancel button, you can gain valuable insights into the underlying issues. Thorough troubleshooting is vital to pinpoint the exact cause of the malfunction and ensure a proper fix.

Why is the Cruise Control Not Working in a GMC Sierra 2500 HD Classic?

When the cruise control in your GMC Sierra 2500 HD Classic fails to operate, it’s crucial to act promptly, as neglecting the issue can lead to safety risks and further complications. Common causes include a malfunctioning control module, faulty sensors, or a defective cruise control switch, all of which can prevent the system from engaging properly. Additionally, problems with the throttle actuation or the cruise control engagement switch can disrupt functionality. It's also important to check the brake light switch, as an adjustment issue or failure here can deactivate the cruise control system. Other potential culprits include blown fuses, defective brake pedal switches, and issues with the throttle control system or ABS. Addressing these problems quickly not only ensures your vehicle operates safely but also prevents more significant damage that could arise from prolonged neglect. By understanding these potential issues, you can effectively troubleshoot and restore your cruise control system, enhancing your driving experience.

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