2003 Dodge Ram 2500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Dodge Ram 2500 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 2003 Dodge Ram 2500 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 Dodge Ram 2500 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.

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 2003 Dodge Ram 2500?

When diagnosing the non-functioning cruise control in a 2003 Dodge Ram 2500, it's essential to adopt 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, examine the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can disrupt the system's functionality. Following this, verify the speed sensor's performance, since it plays a crucial role in relaying speed data to the cruise control module; a faulty sensor can lead to significant issues. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying problems affecting the cruise control system. Lastly, for this model, it's important to inspect the vacuum lines for any leaks or damage, as these can severely impact the operation of the cruise control. By methodically working through these steps, you can effectively identify and address the root cause of the cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2003 Dodge Ram 2500?

When troubleshooting the cruise control system in a 2003 Dodge Ram 2500, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since it is designed to deactivate when the brake pedal is pressed. Additionally, a defective speed sensor can disrupt the necessary communication between the vehicle's speed system and the cruise control, resulting in malfunction. Another issue to consider is vacuum leaks within the cruise control system, as these can lead to a loss of vacuum pressure, hindering the system's ability to maintain speed. Furthermore, a malfunctioning cruise control module may require replacement to restore proper functionality. Lastly, inspect the throttle cable for any signs of fraying or stretching, as these issues can also affect the cruise control's performance. By identifying these potential problems, DIY enthusiasts can better diagnose and address the issues affecting their vehicle's cruise control system.

How urgent is it to address the non-functioning cruise control in my 2003 Dodge Ram 2500?

When it comes to your 2003 Dodge Ram 2500, the urgency of fixing a non-functioning cruise control system cannot be overstated. This feature not only enhances your driving comfort by allowing you to maintain a steady speed, but it also plays a crucial role in your vehicle's overall safety and performance. A malfunctioning cruise control can signal deeper issues within your vehicle's electronic or engine control systems, which, if left unaddressed, could lead to more severe problems and costly repairs. Moreover, neglecting this issue poses significant safety risks, particularly during highway driving where cruise control is most beneficial. By prioritizing the repair of your cruise control system, you not only ensure a more enjoyable driving experience but also protect yourself and others on the road from potential hazards. Taking action now can prevent further damage and save you from more extensive repairs in the future, making it essential to address this issue promptly.

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