2018 Ram 1500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 Ram 1500 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 2018 Ram 1500 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 2018 Ram 1500 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.

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 take when the cruise control isn't working on a 2018 Ram 1500?

When your cruise control isn't functioning on a 2018 Ram 1500, it's important to approach the diagnosis methodically. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, inspect the brake lights; if they are not working properly, it may indicate a faulty brake light switch, which can prevent the cruise control from engaging. Additionally, verify the speed sensors, as these components are crucial for the cruise control to maintain a set speed; any malfunction here can lead to issues. Utilizing a diagnostic scanner to check for error codes can also provide valuable insights into specific problems affecting the cruise control system. Lastly, don’t forget to examine the cruise control buttons on the steering wheel for any signs of damage or lack of responsiveness, as these can hinder the system's functionality. By following these steps, you can effectively troubleshoot and potentially resolve the cruise control issues on your Ram 1500.

What are the common problems that could cause the cruise control to stop working in a 2018 Ram 1500?

When troubleshooting the cruise control system in a 2018 Ram 1500, 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, issues with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to malfunction. A blown fuse in the cruise control circuit is another straightforward issue that can be easily checked and replaced. Furthermore, problems with the throttle control system, such as a malfunctioning throttle position sensor, can hinder the cruise control's performance. Lastly, if the Electronic Control Module (ECM) is experiencing issues, it can significantly impact the cruise control functionality. By identifying these common problems, DIY enthusiasts can better diagnose and potentially resolve the issues affecting their vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2018 Ram 1500?

When it comes to a malfunctioning cruise control system in your 2018 Ram 1500, the urgency to address the problem cannot be overstated. A faulty cruise control can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which significantly increases the risk of accidents on the road. Ignoring these symptoms not only jeopardizes your safety but also that of other drivers and pedestrians. Moreover, delaying repairs can exacerbate the issue, potentially leading to more extensive damage to the vehicle's electronic systems, resulting in costly repairs down the line. Therefore, it is crucial to prioritize the inspection and repair of your cruise control system by a qualified mechanic or dealership. Taking prompt action ensures that your vehicle remains safe and reliable, allowing you to drive with confidence.

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2018 Ram 1500 Cruise Control Not Working: Causes & Repairs