2003 Mitsubishi Montero Sport Cruise Control Isn't Working

Fixing Cruise Control Malfunctions in 2003 Mitsubishi Montero Sport

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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 2003 Mitsubishi Montero Sport 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 2003 Mitsubishi Montero Sport 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.

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.

If the cruise control refuses to turn on at all, the actuator could be at fault. Likewise, if the cruise control stays on but does not maintain a consistent speed, the problem could be a bad actuator. In extreme cases, a malfunctioning actuator could cause the throttle to stick and prevent the vehicle from slowing down. These symptoms may point to a bad actuator. They may also point to other problems with the cruise control and related systems.

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 diagnostic steps to troubleshoot the non-functioning cruise control in a 2003 Mitsubishi Montero Sport?

When troubleshooting the non-functioning cruise control in your 2003 Mitsubishi Montero Sport, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse in the fuse box, as a blown fuse can often be the simplest fix. Next, inspect the cruise control switch on the steering wheel for any visible damage or malfunction, as this component is crucial for activating the system. Following that, examine the brake pedal switch, which is designed to disengage the cruise control when the brake is applied; ensuring this switch is operational is vital for the system's functionality. Additionally, the vehicle speed sensor plays a key role in maintaining your set speed, so verify that it is working correctly. Finally, using a diagnostic scanner to check for error codes can provide deeper insights into any underlying issues affecting the cruise control system. By following these steps in order, you can effectively narrow down the potential causes of the problem and take the necessary actions to restore your cruise control functionality.

What are the common problems that could cause the cruise control to stop working in a 2003 Mitsubishi Montero Sport?

When dealing with a malfunctioning cruise control system in a 2003 Mitsubishi Montero Sport, it's crucial to identify the common problems that may be at play. One frequent culprit is a faulty cruise control switch, which can hinder the system from engaging properly. Additionally, a blown fuse within the cruise control circuit can lead to a complete failure of the system, making it essential to check the fuses first. Another potential issue is vacuum leaks, which can disrupt the necessary pressure for the cruise control to function effectively. A defective speed sensor may also be responsible, as it can cause the system to malfunction or disengage unexpectedly. Furthermore, problems with the brake light switch can prevent the cruise control from activating, as the system is designed to disengage when the brakes are applied. Lastly, a malfunctioning throttle cable can interfere with the cruise control's ability to maintain speed. By systematically diagnosing these issues, DIYers can effectively troubleshoot and resolve the cruise control problems in their Montero Sport.

How urgent is it to repair the non-functioning cruise control in a 2003 Mitsubishi Montero Sport?

When evaluating the urgency of repairing the non-functioning cruise control in a 2003 Mitsubishi Montero Sport, it is essential to recognize the potential risks associated with a malfunctioning system. While the immediate safety threat may not be as pronounced as with other vehicle issues, the unpredictability of speed changes can lead to dangerous driving conditions, particularly on highways where maintaining a steady pace is crucial. Additionally, the absence of cruise control can detract from the overall driving experience, making long journeys more tiring and less enjoyable. Furthermore, neglecting this repair could adversely affect the vehicle's resale value, as prospective buyers often look for well-maintained features. Therefore, while it may not be an emergency, addressing the cruise control issue promptly is advisable to enhance safety, comfort, and the long-term value of your Mitsubishi Montero Sport.

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2003 Mitsubishi Montero Sport Cruise Control Issues & Fixes