2008 Saab 9-5 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Saab 9-5 and How to Fix Them

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Reviewed by
Andrew Hajjar
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 Saab 9-5 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 Saab 9-5 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.

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 steps to diagnose the non-functioning cruise control in a 2008 Saab 9-5?

To effectively diagnose the non-functioning cruise control in your 2008 Saab 9-5, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the fuse associated with the cruise control system, as a blown fuse is a common and easily rectifiable issue. Next, assess the cruise control switch to ensure it is operational; a malfunctioning switch can prevent the system from engaging. Following this, examine the brake pedal switch, which is critical for cruise control functionality; if this switch is stuck or faulty, it will disable the system. Utilizing a diagnostic scanner to check for error codes can provide insights into specific problems affecting the cruise control. Additionally, verify the operation of the vehicle speed sensor, as it relays essential speed data necessary for cruise control to function correctly. Lastly, inspect the throttle position sensor, as its performance directly impacts the cruise control system. By methodically following these steps, you can identify and address the underlying issues affecting your vehicle's cruise control.

What are the common problems that could cause the cruise control to stop working in a 2008 Saab 9-5?

When troubleshooting the cruise control system in a 2008 Saab 9-5, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake pedal switch, which is designed to disengage the cruise control when the brake is applied; if this switch malfunctions, it can prevent the system from engaging. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a consistent speed, as it relies on accurate speed readings to function correctly. Vacuum leaks are another frequent issue, as they can interfere with the vacuum-operated components essential for cruise control operation. Furthermore, a defective cruise control module may fail to send the necessary signals to maintain speed, while electrical problems, such as blown fuses or wiring issues, can also hinder functionality. Lastly, throttle-related issues, including a sticking throttle or problems with the throttle position sensor, can significantly impact the cruise control's performance. By systematically checking these components, you can effectively diagnose and resolve the issues affecting your Saab's cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2008 Saab 9-5?

Addressing the malfunctioning cruise control in your 2008 Saab 9-5 is of utmost urgency due to the significant safety risks it poses. A malfunctioning system can lead to unexpected acceleration or deceleration, which can result in dangerous driving situations and increase the likelihood of accidents. Moreover, delaying repairs can exacerbate the problem, potentially leading to more extensive damage to your vehicle's components, which could result in costly repairs down the line. It is crucial to recognize that timely intervention not only safeguards your safety but also preserves the integrity of your vehicle. Consulting a qualified mechanic or technician is advisable to accurately diagnose and resolve the issue, ensuring that your cruise control system functions properly and your driving experience remains safe and reliable.

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