1990 Dodge Monaco Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 1990 Dodge Monaco and How to Fix Them

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Reviewed by
Bo Fader
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 1990 Dodge Monaco 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 1990 Dodge Monaco 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.

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 steps to diagnose a non-functioning cruise control system in a 1990 Dodge Monaco?

To effectively diagnose a non-functioning cruise control system in a 1990 Dodge Monaco, it's essential to adopt a systematic approach that begins with the simplest potential issues before progressing to more complex diagnostics. Start by checking the fuse associated with the cruise control system, as a blown fuse is a common and easily fixable problem. Next, inspect the cruise control switch to ensure it is operational, since a faulty switch can hinder functionality. Following this, examine the vacuum lines for any leaks or blockages, as these can significantly impact the system's performance. Once these initial checks are complete, test the cruise control module to confirm it is correctly sending and receiving signals. Additionally, verify the speed sensor's functionality, as a malfunction here can prevent the system from maintaining speed. Don't forget to inspect the brake and clutch switches, which are crucial for disengaging the cruise control when necessary. Finally, using a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. By following this structured diagnostic approach, you can efficiently identify and resolve the root cause of the cruise control malfunction in your Dodge Monaco.

What are the common problems that could cause the cruise control to stop working in a 1990 Dodge Monaco?

When dealing with cruise control issues in a 1990 Dodge Monaco, it's essential to understand the common problems that may arise. One of the first things to check is the fuse associated with the cruise control system, as a blown fuse can completely disable its functionality. If the fuse is intact, the next step is to inspect the cruise control switch; a faulty switch can disrupt communication between the control module and the system, preventing it from engaging. Additionally, vacuum leaks can significantly affect the cruise control's ability to maintain speed, so examining the vacuum lines for any signs of wear or damage is crucial. Another potential culprit is the speed sensor; if it's defective, the system may not accurately detect the vehicle's speed, leading to failure. Lastly, issues with the brake light switch can also interfere with the cruise control, as it needs to disengage when the brakes are applied. By systematically checking these components, DIYers can effectively diagnose and address the issues plaguing the cruise control system in their Dodge Monaco.

How urgent is it to address the non-functioning cruise control in a 1990 Dodge Monaco?

When it comes to the non-functioning cruise control in a 1990 Dodge Monaco, understanding the urgency of the situation is crucial for any DIY enthusiast. While this issue may not present an immediate safety risk compared to more critical vehicle components, it is still essential to address it promptly. A malfunctioning cruise control can lead to increased driver fatigue during long trips, as it eliminates the convenience of maintaining a steady speed, which is particularly beneficial for highway driving. Moreover, neglecting this repair could result in higher fuel consumption, as the driver may struggle to maintain an efficient speed manually. Additionally, delaying the repair may lead to further complications within the cruise control system, potentially escalating repair costs down the line. Therefore, while it may not be the top priority, taking the time to fix the cruise control will enhance the overall functionality and comfort of your driving experience, making it a worthwhile endeavor for any DIY mechanic.

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