2005 Pontiac Grand Prix Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Pontiac Grand Prix 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 2005 Pontiac Grand Prix 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 2005 Pontiac Grand Prix 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.

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.

What are the initial steps to diagnose the non-functioning cruise control in a 2005 Pontiac Grand Prix?

To effectively diagnose the non-functioning cruise control in your 2005 Pontiac Grand Prix, start with a thorough inspection of the system. Begin by using a scanner or diagnostic tool to check for any error codes that may indicate specific issues. This initial step can save you time by pinpointing potential problems. Next, conduct a visual inspection of the cruise control components, including the throttle and associated sensors, as these are common culprits for malfunction. Ensure that all connections are secure and free from corrosion. If no obvious issues are found, delve deeper into the wiring and fuses related to the cruise control system, as these can often be overlooked. Remember, while these steps are tailored for the Pontiac Grand Prix, the general approach can be adapted for other vehicles, making it a valuable method for any DIY mechanic.

What are the common problems that could cause the cruise control to stop working in a 2005 Pontiac Grand Prix?

When the cruise control in your 2005 Pontiac Grand Prix stops functioning, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty brake pedal switch, which is designed to disengage the cruise control when the brake is pressed; if it malfunctions, the system may not engage at all. Another frequent issue is a defective speed sensor, which is crucial for maintaining the vehicle's speed; if this sensor fails, the cruise control may not be able to hold a set speed. Additionally, a blown fuse in the cruise control circuit can interrupt power to the system, so checking the fuses is a good first step. Vacuum leaks in the engine can also impact the cruise control's performance, as they can prevent the system from maintaining speed consistently. Furthermore, the cruise control module itself may be faulty, requiring replacement if it fails to operate correctly. Lastly, inspect the wiring for any damage or loose connections, as these can disrupt communication between the components. By systematically addressing these potential issues, you can troubleshoot and restore the functionality of your cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2005 Pontiac Grand Prix?

When it comes to the malfunctioning cruise control in a 2005 Pontiac Grand Prix, urgency is paramount. A faulty cruise control system can lead to unexpected acceleration or deceleration, creating a significant safety hazard for both the driver and other road users. Ignoring these symptoms not only increases the risk of accidents but can also result in more extensive damage to the vehicle's components, leading to costly repairs down the line. Therefore, it is crucial to have the cruise control system inspected and repaired by a qualified mechanic as soon as possible. Taking prompt action not only ensures the safe operation of your vehicle but also helps maintain its overall integrity, preventing further complications that could arise from a neglected issue. Prioritizing this repair is essential for your safety and the longevity of your Pontiac Grand Prix.

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2005 Pontiac Grand Prix Cruise Control Issues & Repair Costs