If you drive a 2018 Jeep Grand Cherokee, you might have noticed the Auto Start Stop warning light popping up on your dashboard. This little symbol isn’t just there to confuse you, it’s a sign that your vehicle’s engine stop-start system isn’t working as it should.
When this light comes on, you’re probably wondering what’s wrong and how to fix it quickly before it affects your driving experience.
You’ll discover the common reasons behind this warning, simple steps you can take to diagnose the problem, and easy fixes that could save you time and money.
Keep reading to learn exactly what that warning light means for your Jeep and how to get your Auto Start Stop system back on track.
Auto Start-stop Warning Light Meaning
The 2018 Jeep Grand Cherokee features an Auto Start-Stop system to save fuel. This system turns off the engine when the vehicle stops and restarts it when you release the brake. A warning light appears on the dashboard if the system detects a problem.
The Auto Start-Stop warning light usually looks like a letter “A” with a circular arrow around it or has an exclamation point. It signals that the system is not working correctly.
This means the engine might not shut off automatically at stops.
What Does The Auto Start-stop Warning Light Indicate?
This light means the Engine Stop-Start (ESS) system has a malfunction. The system may have trouble turning the engine off or back on.
It could be due to electrical or battery issues. The warning helps drivers know the system needs attention.
Common Causes Of The Warning Light
- Faulty Intelligent Battery Sensor (IBS) that checks battery charge.
- Weak or failing main or auxiliary batteries.
- Blown fuses related to the Auto Start-Stop system.
- Sensor glitches that prevent the system from working properly.
Steps To Take When The Warning Light Comes On
- Get an OBD-II scan to find exact error codes.
- Test both the main and secondary batteries for health.
- Check fuses connected to the Auto Start-Stop system.
- Visit a trusted mechanic to inspect the Intelligent Battery Sensor.
Common Causes Of Warning Light
The 2018 Jeep Grand Cherokee Auto Start Stop warning light signals a problem in the system. The system aims to save fuel by shutting off the engine when stopped.
The light appears when the system cannot work correctly. Several common issues trigger this warning light.
Understanding these causes helps drivers address the problem quickly and safely.
Battery Issues
The battery plays a key role in the Auto Start Stop system. It provides power to restart the engine.
A weak or failing battery cannot support this function. The warning light often appears if the battery charge is low.
Problems with the battery’s health or voltage cause the system to stop working.
Many Jeep models have a secondary battery. This auxiliary battery supports the stop-start feature.
If this battery is faulty, the warning light comes on. Testing both batteries helps identify the cause.
Battery replacement or charging usually fixes the issue.
Fuse Strip Problems
The fuse strip protects the vehicle’s electrical circuits. A shorted or blown fuse in the strip can disrupt the Auto Start Stop system.
This interruption triggers the warning light. Fuses may fail due to age, moisture, or electrical surges.
Inspecting and replacing damaged fuses restores system function. This fix is often simple and affordable.
A professional can quickly check the fuse strip for faults.
Sensor Malfunctions
Sensors monitor many parts of the Auto Start Stop system. The Intelligent Battery Sensor (IBS) is important.
It tracks the battery’s state of charge and health. If the IBS malfunctions, the system stops working properly.
Other sensors also affect the system. Faulty sensors send wrong signals to the control unit.
This causes the warning light to activate. Diagnosing sensor problems requires scanning the vehicle’s computer.
Replacing or repairing faulty sensors often clears the warning light. Regular sensor checks keep the system reliable.
Diagnosing The Issue
When the 2018 Jeep Grand Cherokee’s Auto Start Stop warning light turns on, it means the system has detected a problem. Diagnosing the issue quickly helps avoid further complications.
The warning light often signals a fault in the stop/start system, which affects fuel efficiency and emissions.
Simple tools and tests can identify the root cause. Begin by reading the car’s error codes.
Then, check the health of both the main and auxiliary batteries. These steps narrow down the problem and guide the repair process.
Using An Obd-ii Scanner
An OBD-II scanner reads the car’s computer system for error codes. These codes reveal specific issues causing the warning light.
Many auto parts stores offer free scanning services. Plug the scanner into the vehicle’s OBD-II port under the dashboard.
The scanner displays Diagnostic Trouble Codes (DTCs). These codes indicate if sensors or components fail.
For example, a faulty Intelligent Battery Sensor (IBS) often triggers the warning. Reading codes removes guesswork and points to the exact problem.
Testing Main And Auxiliary Batteries
Both the main and auxiliary batteries power the stop/start system. If either battery is weak or failing, the system may not work properly.
Use a voltmeter or take the vehicle to a mechanic for a load test. This test measures battery health under real conditions.
A failing auxiliary battery is a common cause of the warning light. It supports the system during engine restarts.
The main battery’s state of charge is also critical. Replace any battery that shows signs of weakness to restore system function.
Quick Fixes And Repairs
The 2018 Jeep Grand Cherokee’s Auto Start-Stop system helps save fuel by shutting off the engine during stops. Sometimes, the warning light comes on, signaling a system issue.
Many fixes are simple and affordable. This section covers quick repairs you can try to fix the warning light and get the system working again.
Replacing The Secondary Battery
The secondary battery powers the Auto Start-Stop system. It works alongside the main battery to support engine restarts.
A weak or dead secondary battery often triggers the warning light. Replace it with a new one matching the vehicle’s specifications.
This fix usually restores normal system function quickly. Testing the battery before replacement can save time and cost.
Fixing Or Replacing Fuse Strip
The fuse strip protects the Auto Start-Stop electrical circuit. A blown or damaged fuse strip stops power flow and causes the warning light.
Inspect the fuse strip for damage or corrosion. Replace it with a proper fuse strip if needed.
This repair is straightforward and often resolves the warning light problem. Always disconnect the battery before working on fuses for safety.
Resetting The Auto Start-stop System
Sometimes the system needs a reset after repairs or battery replacement. Turn off the engine and open the driver’s door to fully shut down the system.
Wait a few minutes, then restart the engine. This resets the system’s control modules and clears minor glitches.
If the warning light stays on, a scan tool may help clear error codes. A reset often restores system function without complex repairs.
Preventive Maintenance Tips
Preventive maintenance helps keep the 2018 Jeep Grand Cherokee’s auto start-stop system working well. Regular care avoids warning lights and system failures.
Simple checks can save time and money by spotting issues early.
Battery Care And Maintenance
The auto start-stop system relies heavily on a healthy battery. Check the battery terminals often for corrosion.
Clean any build-up to ensure good electrical contact. Test the battery’s charge regularly using a voltmeter or at a local shop.
Replace weak batteries promptly to avoid system errors. Keep the battery securely fastened to prevent damage from vibrations.
Regular System Checks
Scan the vehicle’s computer for error codes using an OBD-II scanner. This reveals hidden problems with the start-stop system.
Inspect the Intelligent Battery Sensor (IBS) as it monitors battery health. Faulty sensors cause the system to disable automatically.
Verify fuses related to the start-stop function are intact. Schedule routine checks with a trusted mechanic to maintain system performance.
When To Seek Professional Help
The 2018 Jeep Grand Cherokee’s Auto Start Stop Warning Light signals a problem. Sometimes, it’s a minor glitch you can fix.
Other times, it means a deeper issue needs expert care. Knowing when to seek professional help can save you time and money.
Signs You Need A Mechanic
The warning light stays on after multiple restarts. The system fails to activate despite normal conditions.
You notice poor engine performance or strange noises. These signs suggest a serious problem.
A trained mechanic can diagnose and fix it correctly.
Complex Battery Issues
The Auto Start Stop system relies on two batteries. A weak or failing secondary battery often causes the warning light.
Battery sensors might also malfunction. Testing and replacing batteries require special tools.
Professionals have the right equipment to handle this safely.
Electrical System Problems
Faulty wiring or blown fuses can trigger the warning light. These issues need detailed inspection and repair.
Incorrect handling can cause further damage or safety risks. Professional technicians know how to troubleshoot electrical faults efficiently.
Using Advanced Diagnostic Tools
Simple code readers may not detect all errors. Mechanics use advanced OBD-II scanners to find hidden trouble codes.
These tools provide precise information for repairs. Visiting a professional ensures accurate diagnosis and proper solution.
What Does The Auto Start-stop Symbol With Exclamation Point Mean On Jeep?
The auto start-stop symbol with an exclamation point on a Jeep signals a system malfunction. It often relates to battery or sensor issues needing attention.
How To Fix Auto Start-stop Warning Light?
Check your battery health and Intelligent Battery Sensor first. Use an OBD-II scanner to identify error codes.
Replace faulty fuses or batteries to fix the auto start-stop warning light.
How To Reset Jeep Auto Start-stop?
To reset Jeep auto start-stop, turn off the engine and restart the vehicle. If the warning persists, scan for error codes and check battery health.
Replace a faulty battery or fuse if needed. Consult a mechanic if the system still malfunctions.
What Does It Mean When The Auto Start-stop Light Comes On?
The auto start-stop light signals a system malfunction. It often indicates battery issues or sensor faults affecting engine stop-start operation.
Conclusion
The 2018 Jeep Grand Cherokee's auto start-stop warning light signals a system issue. Often, a weak battery or sensor fault causes this alert.
Running a quick diagnostic scan helps pinpoint the exact problem. Testing both batteries ensures they work properly.
Addressing these checks can restore the system's function. Keeping an eye on the warning light protects your vehicle's performance.
Taking timely action prevents further complications and saves repair costs. Stay informed and act early to keep your Jeep running smoothly.
