Saturn LS Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Saturn LS 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Saturn LS 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 Saturn LS 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 throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

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.

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 Saturn LS

When troubleshooting cruise control issues in a Saturn LS, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse is a common and easily fixable problem that can prevent the system from functioning. If the fuse is intact, inspect the brake system, focusing on the brake lights and the brake switch, since any malfunction here can disrupt the cruise control's operation. Next, consider any engine-related issues; a check engine light or other engine problems can directly impact the cruise control functionality. If the cruise control operates intermittently, take note of the conditions under which it fails, as this can provide valuable clues for further diagnosis. Should these initial checks not resolve the issue, it may be time to consult a professional mechanic who has experience with Saturn LS vehicles, as they can offer deeper insights into more complex problems. By following this structured approach, you can effectively identify and address the root causes of cruise control issues in your Saturn LS.

What Could Cause the Cruise Control to Malfunction in a Saturn LS?

When dealing with cruise control malfunctions in a Saturn LS, it's essential to understand the common problems that may arise. One of the first things to check is the fuses, as a blown fuse can disrupt the power supply to the cruise control system, rendering it inoperable. Additionally, the brake pedal position sensor plays a crucial role; if it is faulty, it can prevent the cruise control from engaging properly. Another area to investigate is the throttle body, as malfunctions here can directly affect the cruise control's ability to maintain speed. It's also important to consider the PRNDL or shifter position switch, as issues with this component can lead to similar problems. A defective brake pedal switch is another frequent culprit, as it may not signal the cruise control system correctly when the brakes are applied. Furthermore, problems with the throttle control system can hinder the cruise control's functionality, while ABS malfunctions can also interfere with its operation. For older Saturn LS models, a broken vacuum line may be a potential issue, particularly in systems that rely on vacuum pressure for cruise control functionality. By systematically checking these components, DIYers can effectively diagnose and address the underlying causes of cruise control malfunctions in their Saturn LS.

Why is the Cruise Control Not Working in a Saturn LS?

When your Saturn LS's cruise control system fails, it’s crucial to address the issue without delay. Ignoring symptoms such as a blown fuse, a defective brake pedal switch, or problems with the throttle control can not only compromise your driving experience but also pose significant safety risks. For instance, if the cruise control unexpectedly accelerates or fails to disengage, it could lead to dangerous situations on the road. Additionally, underlying electrical problems, such as a faulty control module or sensor, can escalate into more severe issues if left unchecked, potentially resulting in costly repairs. By diagnosing and resolving these common causes early on, you can ensure a safer driving experience and maintain the functionality of your vehicle's cruise control system.

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Saturn LS Cruise Control Issues: Causes & Repair Costs