How to Reset Jeep Auto Start Stop: Quick and Easy Guide
Reading Time: 8 minutes If your Jeep’s Auto Start Stop system isn’t working like it should, you’re not alone. This feature is designed to save fuel by shutting off the engine at stops, but sometimes it can get stuck or show warning lights that leave you puzzled.
You might see that “A” symbol with a circle and exclamation mark on your dashboard and wonder what it means—and more importantly, how to fix it. Don’t worry. In this guide, you’ll learn exactly how to reset your Jeep’s Auto Start Stop system step-by-step, understand common reasons why it fails, and get simple tips to keep it running smoothly.
Keep reading, and you’ll be back to enjoying your Jeep’s smart fuel-saving feature in no time.
Auto Start Stop Basics
The Auto Start Stop system in your Jeep helps save fuel and reduce emissions. It automatically turns off the engine when the vehicle stops, like at a traffic light. The engine restarts when you release the brake or press the accelerator. This feature improves efficiency and reduces idle time.
Understanding how this system works and recognizing its indicators can help you use it better. It also helps in troubleshooting if the system does not work properly or needs resetting.
How It Works
The system monitors several factors like battery charge, engine temperature, and brake status. When conditions are right, it turns off the engine to save fuel. The engine restarts instantly when you lift your foot from the brake. This process is smooth and does not affect driving comfort.
If any condition is not met, the system stays off to protect your vehicle. For example, it will not activate if the battery is low or the engine is cold.
Common Indicators
The dashboard shows symbols to inform you about the system’s status. A common symbol is a letter “A” inside a circle. If this symbol has an exclamation mark, it means there is a fault. You might also see messages explaining why the system is off.
These indicators warn you if the system is disabled due to low battery, engine temperature, or sensor issues. Watching for these signs helps you know if a reset or repair is needed.
Common Issues
Several common issues can cause your Jeep’s auto start-stop system to malfunction. Understanding these problems helps you identify why the system won’t reset properly. Some issues need simple fixes, while others require professional attention.
Battery Problems
The auto start-stop system depends heavily on the battery’s condition. A weak or failing battery often stops the system from activating. Jeep models use both a main and an auxiliary battery. If either battery is low or damaged, the system may refuse to reset. The Intelligent Battery Sensor (IBS) also monitors battery health. A faulty IBS can send incorrect signals, causing system errors. Regular battery checks help keep the system running smoothly.
Sensor Faults
Sensors play a key role in the auto start-stop function. They detect engine temperature, brake pressure, and vehicle speed. If any sensor fails or sends wrong data, the system can deactivate. Brake switch problems are common culprits. A dirty or broken sensor can mislead the system into thinking conditions are unsafe. Replacing or cleaning sensors often fixes these faults. Always inspect sensors after system warnings appear.
Environmental Factors
External conditions affect the auto start-stop system’s performance. Very cold or hot weather may stop the system from working. Extreme temperatures can harm battery life and sensor accuracy. High demand for air conditioning or heating also disables the system. Slopes and heavy loads may prevent engine shutdown too. The system avoids risks by staying off in these cases. Knowing these limits helps avoid confusion about system faults.
Warning Symbols
Warning symbols on your Jeep’s dashboard give important clues about the Auto Start Stop system. These icons alert you when the system needs attention or reset. Understanding these symbols helps keep your Jeep running smoothly and avoids potential issues.
Circle A With Exclamation Mark
The circle A with an exclamation mark means the Auto Start Stop system has a fault. This warning shows the system is not working properly and needs inspection. It differs from the symbol that appears when the system is just turned off manually.
Common causes include weak battery health, sensor faults, or brake switch problems. The system may stop working if the battery is low or the engine is too cold or hot. This warning signals a real malfunction, not just a temporary pause.
Dashboard Messages
Your Jeep’s dashboard displays messages explaining why Auto Start Stop is off. These messages appear in the instrument cluster between the gauges. They give details like “Battery Charging” or “Engine Not Warm.”
Check these messages to understand the issue. They help identify if the problem is due to battery condition, temperature, or sensor errors. These messages guide you in deciding if a reset or service is needed.
Resetting The System
Resetting the Jeep Auto Start Stop system helps fix errors and restore normal function. This process clears faults that may prevent the system from working properly. Resetting is simple and can be done with or without special tools.
Completing a reset can improve your Jeep’s performance and reduce annoying warning lights. The system may reset after driving cycles, but a manual reset ensures the issue clears immediately. Follow the steps carefully to avoid mistakes.
Step-by-step Reset Guide
Begin by turning off your Jeep and removing the key. Wait at least 10 seconds to let the system power down fully. Next, reconnect the key and start the engine without pressing the brake pedal.
Look for the Auto Start Stop button on your dashboard or center console. Press and hold this button for about 10 seconds. You will see the indicator light flash or turn off, showing the system reset.
Turn off the engine and wait a minute. Start the engine again and check if the Auto Start Stop system works normally. Repeat the process if the issue remains. This simple reset often solves minor glitches.
Using OBD-II Scanner
Connect an OBD-II Scanner to your Jeep’s diagnostic port, usually located under the dashboard. Turn on the ignition without starting the engine. Launch the scanner’s app or software on your device.
Navigate to the system menu and find the Auto Start Stop or ESS module. Select the option to read codes or faults. Note any error codes displayed for reference.
Choose the option to clear or reset codes. The scanner will erase stored faults and reset the system. Turn off the ignition and disconnect the scanner. Start the engine and verify if the system operates correctly.
Using an OBD-II scanner is more precise and helps diagnose deeper issues. It also clears persistent fault codes that a simple button reset cannot fix.
Troubleshooting Tips
Troubleshooting the Jeep Auto Start Stop system can solve many common issues. This system relies on several components working correctly. Problems often stem from battery health, brake switch, or sensor errors. Checking each part helps identify why the system may not reset or work properly.
Checking Battery Health
The battery powers the Auto Start Stop system. A weak or failing battery can stop the system from activating. Use a voltmeter to test the battery voltage. It should read around 12.6 volts when the engine is off. Look for any corrosion on battery terminals. Clean the terminals if needed. Replace the battery if the voltage is low or it fails a load test.
Inspecting Brake Switch
The brake switch signals the system when you press the brake pedal. A faulty brake switch can stop the Auto Start Stop from resetting. Press the brake pedal and listen for a clicking sound near the pedal. If there is no click, the switch may be broken. Test the switch with a multimeter for continuity. Replace the brake switch if it shows no response or erratic signals.
Reviewing Sensor Status
Sensors monitor engine temperature, vehicle speed, and other data for the system to work. Faulty sensors cause system errors and prevent reset. Use an OBD-II scanner to check for sensor error codes. Pay attention to the Intelligent Battery Sensor (IBS) and coolant temperature sensor. Clear any error codes and see if the system resets. Replace sensors that fail tests or show repeated faults.
When To Seek Professional Help
Knowing when to seek professional help for your Jeep’s Auto Start Stop system is vital. Some problems require expert tools and knowledge. Attempting complex fixes without experience may cause more damage. Watch for signs that indicate a deeper issue beyond simple resets.
Persistent Warning Lights
Warning lights that stay on after attempts to reset the system signal a serious problem. These lights mean the vehicle’s computer detects an error. Ignoring them can reduce your Jeep’s performance and safety. A professional can use diagnostic tools to find the exact cause and fix it properly.
Complex Sensor Issues
The Auto Start Stop system relies on many sensors to work correctly. Faulty or failing sensors can cause the system to malfunction. These issues often need advanced testing and sensor replacement. Mechanics have the right equipment to handle sensor repairs safely and accurately.
Frequently Asked Questions
Can You Reset The Start/stop System?
Yes, you can reset the start/stop system by turning off the ignition and restarting the vehicle. Check the dashboard for specific error messages. If issues persist, inspect the battery, sensors, or brake switch. Use an OBD-II scanner or visit a technician for diagnosis and repair.
Why Is My Jeep Auto Start-stop Not Working?
Your Jeep’s auto start-stop may not work due to unmet conditions like low battery, extreme temperatures, or max A/C. Faulty batteries, sensors, or the Intelligent Battery Sensor (IBS) can also cause issues. Check your dashboard messages for details and consider battery or sensor inspection.
What Does The A With A Circle Around It And Exclamation Point Mean On A Jeep?
The “A” with a circle and exclamation on a Jeep signals a fault in the Auto Start/Stop system. It often indicates battery, brake sensor, or other sensor issues. Check the dashboard message for details and consider a diagnostic scan or professional service to fix the problem.
How To Permanently Turn Off Auto Start-stop Jeep Wrangler?
To permanently turn off auto start-stop on a Jeep Wrangler, press the auto start-stop off button each time you start the vehicle. No factory setting allows a permanent disable. For a lasting solution, consider aftermarket modules or dealer reprogramming.
Read Also: How to Disable Auto Start Stop Jeep Grand Cherokee
Conclusion
Resetting your Jeep’s Auto Start Stop system is simple and useful. Follow the steps carefully to avoid issues. Keep an eye on your dashboard messages for alerts. Regular battery checks help maintain system performance. If problems persist, visit a mechanic for proper diagnosis.
This keeps your Jeep running smoothly and saves fuel. Remember, understanding your vehicle ensures safer and smarter driving.
