1991 Dodge Ram 50 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 1991 Dodge Ram 50

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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 1991 Dodge Ram 50 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 1991 Dodge Ram 50 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.

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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 1991 Dodge Ram 50?

When troubleshooting the non-functional cruise control in a 1991 Dodge Ram 50, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse can often be the simplest issue to resolve. Next, inspect the cruise control switch for any visible damage or wear, ensuring it is operational. Following this, examine the vacuum lines for leaks or damage, as these can significantly impact the system's performance. If these initial checks do not reveal the problem, proceed to test the cruise control module to confirm it is sending the correct signals. Lastly, verify the functionality of the speed sensor, which is crucial for the cruise control system to operate correctly. By methodically working through these steps, you can effectively diagnose and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1991 Dodge Ram 50?

When diagnosing cruise control issues in a 1991 Dodge Ram 50, it's essential to consider several common problems that may be at play. A blown fuse is often the first culprit to check, as it can completely disable the system. If the fuse is intact, the next step is to inspect the cruise control switch, which may be faulty and prevent proper engagement. Additionally, vacuum leaks can disrupt the system's operation, so examining the vacuum lines for any signs of wear or damage is crucial. The speed sensor also plays a vital role; if it's malfunctioning, the cruise control may struggle to maintain a constant speed. Furthermore, issues with the brake light switch can interfere with the system's ability to engage or disengage, so ensure that this component is functioning correctly. Lastly, a malfunctioning throttle cable can hinder the cruise control's performance, making it important to check for any binding or damage. By systematically addressing these potential issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their Dodge Ram 50.

How urgent is it to repair the non-functioning cruise control in a 1991 Dodge Ram 50?

When assessing the urgency of repairing the non-functioning cruise control in a 1991 Dodge Ram 50, it's essential to weigh the potential consequences of neglecting this issue. While cruise control is primarily a convenience feature, its absence can lead to increased driver fatigue, especially during long drives, which may inadvertently compromise safety. If you find yourself frequently distracted by the need to manually adjust your speed, addressing the repair sooner rather than later could enhance your overall driving experience. Additionally, if you often travel on highways or have lengthy commutes, restoring this feature can significantly improve comfort and reduce the physical strain of driving. Furthermore, if you plan to sell your vehicle in the future, having all systems, including cruise control, in working order can positively impact its resale value. Ultimately, while the repair may not be immediately critical, considering your driving habits and comfort can help you determine the right timing for this repair.

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