2003 Chrysler 300M Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Chrysler 300M 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2003 Chrysler 300M 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 Chrysler 300M 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.

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.

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 the non-functioning cruise control in a 2003 Chrysler 300M?

To effectively diagnose the non-functioning cruise control in a 2003 Chrysler 300M, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the fuse associated with the cruise control system, as a blown fuse is a straightforward fix that can often resolve the problem. Next, assess the cruise control switch on the steering wheel to ensure it is operational; a malfunctioning switch can easily prevent the system from engaging. Following this, examine the brake pedal switch, which is crucial for disengaging the cruise control when brakes are applied; if this switch is faulty, it may inadvertently disable the cruise control. Additionally, testing the vehicle speed sensor is vital, as it provides necessary data for the cruise control to function correctly. Utilizing a diagnostic scanner to check for error codes can further assist in identifying specific issues within the system. Lastly, a thorough inspection of the wiring and connections related to the cruise control is necessary, as any loose or damaged wiring can disrupt functionality. By following this structured approach, you can efficiently diagnose and address the issues affecting the cruise control in your Chrysler 300M.

What are the common problems that could cause the cruise control to stop working in a 2003 Chrysler 300M?

When troubleshooting the cruise control system in a 2003 Chrysler 300M, it's essential to consider several common problems that could be affecting its functionality. One of the primary culprits is a failed control module, which can disrupt the entire system's operation. Additionally, issues with sensors or switches related to the cruise control can also lead to malfunctions. Throttle actuation problems are another significant factor; if the throttle isn't responding correctly, the cruise control may not engage as intended. It's also important to check for a blown fuse, as this can easily disable the cruise control system. A defective brake pedal switch is another frequent issue; if the system detects that the brake is engaged, it will automatically deactivate cruise control. Lastly, faulty brake lights or a malfunctioning brake switch can contribute to the problem, as these components are integral to the cruise control's safety features. By systematically examining these areas, you can effectively diagnose and potentially resolve the cruise control issues in your Chrysler 300M.

How urgent is it to address the non-functioning cruise control in a 2003 Chrysler 300M?

When it comes to the non-functioning cruise control in a 2003 Chrysler 300M, understanding the urgency of the situation is crucial for any DIY enthusiast. While a malfunctioning cruise control may not pose an immediate safety risk like brake or steering issues, it can still significantly affect your driving experience. The convenience of maintaining a steady speed can reduce fatigue during long drives and enhance fuel efficiency, making it a feature worth addressing. Moreover, a faulty cruise control system could signal underlying electronic problems that, if ignored, might escalate into more serious mechanical failures. Therefore, while it may not be the top priority on your maintenance list, it is advisable to investigate the issue sooner rather than later. Taking the time to diagnose and repair the cruise control can prevent further complications and ensure that your vehicle remains reliable and enjoyable to drive.

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