2005 Isuzu Ascender Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Isuzu Ascender 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 Isuzu Ascender 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 Isuzu Ascender 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 are the initial steps to diagnose the non-functional cruise control in a 2005 Isuzu Ascender?

When diagnosing the non-functional cruise control in a 2005 Isuzu Ascender, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the fuse associated with the cruise control system, as a blown fuse can often be the simplest explanation for malfunction. Next, examine the cruise control switch for any visible damage or wear, ensuring it is operational. The brake pedal switch is another critical component to check, as it disengages the cruise control when the brake is applied; if it's faulty, it could prevent the system from engaging. Additionally, testing the vehicle speed sensor is vital, as it provides the necessary speed data for the cruise control to function correctly. Finally, utilizing a diagnostic scanner to check for error codes can reveal underlying issues that may not be immediately apparent. By following this structured approach, you can effectively identify and address the root cause of the cruise control problem in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2005 Isuzu Ascender?

When troubleshooting the cruise control system in a 2005 Isuzu Ascender, it's essential to understand the common problems that could lead to its failure. One of the primary issues is a faulty brake pedal switch, which is crucial for disengaging the cruise control when the brake is applied. If this switch malfunctions, it can prevent the system from engaging properly. Another potential culprit is a defective speed sensor; this component is responsible for relaying the vehicle's speed to the cruise control system, and if it fails, the system may struggle to maintain a constant speed. Additionally, a blown fuse can completely disable the cruise control, making it essential to check the fuse box for any issues. Vacuum leaks in the engine can also disrupt the performance of the cruise control, causing it to disengage unexpectedly. Lastly, a malfunctioning cruise control module can be a significant factor in the system's failure to operate correctly. Identifying these common problems can help you diagnose the issue more effectively, but for a thorough inspection and repair, consulting a professional mechanic is recommended.

How urgent is it to repair the non-functioning cruise control in a 2005 Isuzu Ascender?

Repairing the non-functioning cruise control in your 2005 Isuzu Ascender should not be overlooked, as neglecting this issue can lead to significant safety risks and affect your driving experience. Cruise control is designed to enhance convenience, particularly during long drives, by allowing you to maintain a steady speed without constant pedal pressure. If the system is malfunctioning, it may indicate underlying problems, such as a blown fuse or a faulty brake pedal switch, which could compromise the vehicle's overall performance. Delaying repairs can result in increased driver fatigue and inconvenience, especially on highways where cruise control is most beneficial. Moreover, a malfunctioning system may also signal more serious issues that could escalate if not addressed promptly. Therefore, while the urgency may vary based on individual driving habits, it is advisable to prioritize the repair of your cruise control system to ensure both safety and efficiency on the road.

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2005 Isuzu Ascender Cruise Control Issues & Repairs