2008 GMC Envoy Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 GMC Envoy 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 2008 GMC Envoy 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 2008 GMC Envoy 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 steps should I take to diagnose the non-functioning cruise control in my 2008 GMC Envoy?

To effectively diagnose the non-functioning cruise control in your 2008 GMC Envoy, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by examining the fuse associated with the cruise control system, as a blown fuse is a straightforward issue that can easily disrupt functionality. Next, inspect the wiring for any visible damage or loose connections, as these can often lead to operational failures. Once you've ruled out these basic issues, test the cruise control switch located on the steering wheel; a malfunctioning switch is a common culprit in cruise control problems. If these initial checks do not reveal the issue, utilize a diagnostic scanner to identify any error codes that may provide insight into the underlying problem. Additionally, consider the vacuum lines, as they play a crucial role in the operation of the cruise control system; any leaks or damage here can significantly impact performance. Finally, inspect the speed sensors, which are essential for the cruise control to function correctly. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 2008 GMC Envoy?

When troubleshooting the cruise control system in a 2008 GMC Envoy, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since the system is designed to disengage when the brake pedal is pressed. Additionally, a defective speed sensor can disrupt the system's ability to maintain a constant speed, making it crucial to check this component. Another potential issue is a blown fuse within the vehicle's electrical system, which can halt the cruise control's functionality altogether. Furthermore, vacuum leaks in the engine can significantly impact the operation of the cruise control, as it relies on vacuum pressure to function correctly. Lastly, a malfunctioning cruise control module may also be responsible for the system's failure. By systematically addressing these common issues, you can effectively diagnose and resolve the cruise control problems in your GMC Envoy, ensuring a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in a 2008 GMC Envoy?

When it comes to the malfunctioning cruise control in a 2008 GMC Envoy, the urgency of addressing the issue cannot be overstated. A malfunctioning system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which significantly increases the risk of accidents on the road. Ignoring these symptoms not only jeopardizes your safety but also that of other drivers and pedestrians. Moreover, delaying repairs can exacerbate the problem, potentially leading to more extensive and costly damage to the vehicle's systems. Therefore, it is crucial to have the cruise control inspected and repaired by a qualified mechanic as soon as possible. Taking prompt action not only ensures your safety but also helps maintain the overall integrity and reliability of your vehicle, preventing further complications down the line.

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2008 GMC Envoy Cruise Control Issues & Repairs | RepairPal