The Auto Start Stop light on your 2017 Chrysler Pacifica indicates an issue with the system designed to save fuel by shutting off the engine when the vehicle is stationary. When this light illuminates, it's crucial to address the problem promptly to ensure optimal vehicle performance and fuel efficiency.

Common Causes

Several factors can trigger the Auto Start Stop light:

  • Low battery voltage: The most frequent cause is a weak or failing battery, particularly the auxiliary battery.
  • Faulty battery sensor: The Intelligent Battery Sensor (IBS) may be malfunctioning.
  • Hood latch sensor issues: Surprisingly, a faulty hood latch sensor can affect the Auto Start Stop system.
  • Electrical system problems: Various electrical components can impact the system's functionality.

Troubleshooting Steps

Follow these steps to diagnose and potentially resolve the issue:

1. Check battery health: Use a multimeter to test both the main and auxiliary batteries. The main battery should read around 12.6V when the engine is off, while the auxiliary battery should be above 12.1V.

2. Inspect battery connections: Ensure all battery terminals are clean and securely fastened.

3. Reset the system: Disconnect both batteries for about 15 minutes, then reconnect them (auxiliary first, then main).

4. Check for error codes: Use an OBD-II scanner to look for any diagnostic trouble codes related to the Auto Start Stop system.

5. Inspect the hood latch sensor: Ensure it's properly connected and functioning.

6. Test the Intelligent Battery Sensor: This component may need replacement if faulty.

Professional Diagnosis

If the above steps don't resolve the issue, consider these options:

  • Visit a Chrysler dealership: They have specialized diagnostic tools for the Pacifica's systems.
  • Consult a certified mechanic: Look for one experienced with Chrysler vehicles and start-stop systems.

Preventive Measures

To avoid future Auto Start Stop light issues:

  • Regular battery maintenance: Check and clean battery terminals periodically.
  • Timely battery replacement: Consider replacing batteries every 3-4 years, especially in harsh climates.
  • Keep electrical systems in good condition: Address any electrical issues promptly to prevent system overload.

FAQs About Chrysler Pacifica Auto Start Stop Light

    • Can I still drive with the Auto Start Stop light on?
      Yes, but the fuel-saving feature won't function. It's best to address the issue soon for optimal performance.
    • How often should I replace the auxiliary battery?
      Typically every 3-4 years, but this can vary based on usage and climate conditions.
    • Will disabling the Auto Start Stop system fix the warning light?
      No, disabling the system doesn't address the underlying issue causing the warning light.

By following these troubleshooting steps and maintaining your Chrysler Pacifica's electrical system, you can often resolve Auto Start Stop light issues and ensure your vehicle continues to operate efficiently.