Cadillac STS Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Cadillac STS 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Cadillac STS 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 Cadillac STS 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.

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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

Troubleshooting Cruise Control Issues in a Cadillac STS

When troubleshooting cruise control issues in your Cadillac STS, begin by checking the basics to identify any simple fixes. Start with the cruise control switch harness connector; ensure there are no loose or corroded connections that could disrupt functionality. Next, inspect the brake pedal switch, as a malfunctioning switch can inadvertently disable the cruise control system. It's also wise to scan for any engine or transmission trouble codes, as these can provide insight into underlying issues affecting the cruise control. Don’t forget to check the cruise control fuse; a blown fuse is a common culprit that can easily be overlooked. If these initial checks do not resolve the problem, consider seeking professional assistance for a more thorough diagnosis. Regular maintenance and prompt attention to warning lights can help prevent future cruise control issues, ensuring a smoother driving experience.

What to Check When the Cruise Control Isn't Working in a Cadillac STS?

When troubleshooting cruise control issues in a Cadillac STS, it's essential to understand the common problems that may arise within the system. Start by examining the control module, sensor, and switch, as these are frequently the culprits behind malfunctioning cruise control. Additionally, throttle actuation problems can disrupt the system's functionality, so ensure that these components are in good working order. It's also crucial to inspect the connections at the harness connector of the cruise control switch; poor connections can lead to intermittent issues that are often overlooked. A simple yet effective step is to tap the brake pedal on the side, which can reset the cruise control if the problem is linked to a sensitive sensor. If these initial checks do not yield results, consider performing diagnostic testing to uncover any deeper issues that may require professional attention. By methodically addressing these common problems, you can enhance your chances of successfully restoring the cruise control functionality in your Cadillac STS.

Why is the Cruise Control Not Working in a Cadillac STS?

When the cruise control in your Cadillac STS is not functioning, it’s crucial to understand the urgency of the situation. Ignoring this issue can lead to unsafe driving conditions, especially on long trips where maintaining speed is essential for safety. Common causes of cruise control failure include problems with the control module, sensors, or switches, which can disrupt the system's functionality. Additionally, throttle actuation issues may prevent the cruise control from engaging properly. It’s also important to check for poor connections at the harness connector of the cruise control switch, as these can exacerbate the problem. A faulty switch or malfunctioning module can further complicate matters, making it imperative to diagnose the specific cause of the malfunction. Addressing these issues promptly not only enhances your driving experience but also ensures your safety on the road.

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