Jeep Auto Start Stop Not Working? How To Fix?

Jeep’s auto start/stop system is a cutting-edge feature designed to enhance fuel efficiency and reduce emissions by automatically shutting down the engine when the vehicle comes to a stop. While this innovation proves advantageous for many Jeep owners, it’s not without its challenges. 

The Jeep auto start stop not working issue can happen because of various factors, ranging from a weak battery and faulty wiring to malfunctions in the start/stop control module. It can also be a malfunctioning alternator, starter, or sensor. There can also be software glitches or parasitic draws.

This problem isn’t exclusive to a particular Jeep model, as it also affects other makes and models. At some point in their ownership, many owners notice that their Jeep’s auto start/stop is not working. If you face Jeep’s auto start stop not working issues, you’re not alone. 

Jeep Auto Start Stop Not Working and Shows Stop/Start Not Ready Error
Stop/Start Not Ready Jeep Warning

In this article, I’ll explain the complexities surrounding the auto start/stop feature. To make the Jeep auto start/stop working, I’ll offer a comprehensive understanding of what can hinder your Jeep’s functionality, guide you through the diagnostic process, and provide step-by-step solutions. Whether it’s a weak battery, a malfunctioning sensor, or issues with the electrical system, you’ll have a proper insight on how to troubleshoot and reset the auto start/stop feature. 

Let’s start by learning the intricacies of how the auto start/stop system functions so that you may understand why your Jeep’s start/stop system stopped working.

Table of Contents

How Does the Jeep Auto Start/Stop System Work?

Jeep’s auto start/stop feature is a remarkable innovation. Let’s look at how this technology works, its advantages, and the potential issues you may encounter.

Working System

Your auto start/stop feature, also known as the engine stop/start, operates as a dynamic system designed to conserve fuel during idleness. When your vehicle is stationary with the brake pedal depressed, the system automatically shuts off the engine. This temporary engine shutdown reduces fuel consumption and emissions, making driving more environmentally friendly.

Several sensors continuously monitor key aspects of your vehicle’s condition. They assess factors such as battery charge, engine temperature, vacuum levels, and brake pedal position. If your car comes to a complete stop and you apply the brake pedal, the sensors trigger the auto start/stop feature to deactivate the engine.

The engine seamlessly restarts as soon as you release the brake pedal or switch the transmission to the drive mode, ensuring a smooth transition back into motion.


  • Fuel Economy: One of the primary benefits of your auto start/stop feature is its contribution to fuel conservation. By automatically shutting down the engine when idle, the feature reduces fuel consumption and, consequently, lowers emissions.
  • Improved Performance: This innovative technology lightens the load on your engine during periods of inactivity, minimizing wear and tear. The reduced strain on the engine promotes longevity.
  • Reduced Noise: The auto start/stop feature creates a quieter and calmer ride as the engine stops when your vehicle is stationary. The absence of engine noise during idle periods enhances your overall driving experience.
  • Decreased Total Cost of Ownership: The feature contributes to a decreased total cost of ownership by reducing the frequency of engine oil changes and minimizing wear on critical components. This makes it an economically appealing technology.


While your auto start/stop feature brings a host of advantages, it is not without its challenges. Problems with the system can lead to:

  • Auto Start/Stop Malfunctions: Malfunctions in the auto start/stop feature can result in poor fuel efficiency, undermining the very purpose of the technology. Also, issues with the system may lead to a loss of power, affecting your vehicle’s overall performance and responsiveness.
  • Reliability Problems: The delicate nature of the system means that malfunctions can give rise to reliability issues, impacting the consistent operation of your vehicle.

In the subsequent sections, Let’s understand the common causes behind the malfunctioning of your Jeep’s auto start/stop feature and the practical solutions for troubleshooting and resolving these issues.

Why Is Your Jeep Auto Start Stop Not Working? How Do You Fix It?

As a Jeep owner, you want the start/stop system to work for fuel efficiency and reduced emissions. But when you discover that your Jeep’s start/stop feature is not working, frustration sets in.

If your Jeep’s auto start/stop isn’t working, you may see the warning Stop/Start Unavailable Service Stop/Start System. Whether the warning is there or not, scroll to the start/stop screen on your dashboard. For example, it may say, Stop/Start Not Ready Engine Temperature Too Low or other Stop/Start Not Ready warnings. In that case, troubleshooting the problem becomes easy. If no cause is mentioned, then it becomes a bit tricky. 

If you’re wondering how to get your auto start/stop back in action, go through the following steps:

1. Faulty Battery

One significant factor that can disrupt this system is a faulty or weak battery. Your start/stop system demands more power than a standard electrical system. A failing battery may have trouble fulfilling these requirements.

In that case, you may see the Start/Stop Not Ready Battery Charging or Stop/Start Not Ready Battery Protection Mode or even the Start/Stop Not Ready Battery Charging warning on your dashboard. If your battery is weak or faulty, you may encounter issues such as:

  • Failure to Engage: The start/stop system may not engage, leading to a potential warning message on your dashboard.
  • Limited Battery Life: A battery over three years old, especially in extreme weather conditions, may struggle to sustain the demands of the start/stop system.
  • Incomplete Charging: If the battery cannot maintain the required charge, it can cause the start/stop system to fail.

How Do You Diagnose and Fix the Battery Issues?

Check the Battery Condition

A weak or failing battery can severely impact the functionality of the start/stop system. Have the battery checked or replaced if necessary if you think it may be the issue. 

Ensure Proper Charging

Check the battery’s charging system to ensure performance. Run your vehicle for an extended period to allow the battery to charge up adequately.

Address Inadequate Connections

   Inspect battery connections for corrosion or looseness. If you notice corrosion:

  •    Disconnect: Start by disconnecting the battery cables. Safety first!
  •    Spray Cleaner: Spray some cleaner on posts and terminals. It eliminates dirt and corrosion.
  •    Brush Away Debris: Grab a wire brush to remove any debris. After cleaning, apply dielectric grease to the terminals to prevent future corrosion.
  •    Reconnect: Now, reconnect the cables. Begin with the positive cable.
Corroded Jeep Battery Terminals
Battery Replacement Procedure

   If your battery is weak or dead, follow these steps:

  • Uncover the Battery: Remove the battery cover and unplug terminal protectors.
  •  Negative First: Disconnect the negative cable before the positive one.
  •  Free the Battery: Unscrew the bolts using a wrench or socket. Gently take the battery out.
  •  Clean: Clean up the battery tray.
  •  Put the New Battery: Install the shiny new battery with care.
  •  Positive First: Reconnect the positive cable first.

Always monitor battery conditions, considering temperature extremes and charge levels. If you suspect that the battery is faulty, taking these steps will ensure that your Jeep’s start/stop system works and contributes to your Jeep’s overall performance.

2. Malfunctioning Starter Motor

The starter motor is an integral part of your Jeep. It undergoes frequent operation each time your engine starts and stops. Problems with the starter motor may result in:

  • Incorrect System Operation: A faulty starter motor may hinder the proper functioning of your start/stop system.
  • Damaged Circuitry: The circuitry that operates the starter motor could be damaged or disconnected, impacting the system’s reliability.
  • Engine Non-Start: A damaged starter motor can prevent your engine from starting, directly affecting the start/stop system.

How Do You Diagnose and Fix the Starter Motor Malfunctions?

Address Circuitry Issues

If the problem lies in the circuitry, repair or reconnect the damaged components. Ensure the integrity of the circuitry for consistent operation of the start/stop system.

Replace Faulty Starter Motor

A faulty Jeep starter may exhibit symptoms such as the engine failing to turn over when the ignition key is turned, along with unusual noises like clicking, grinding, or whirring during ignition attempts. Also, intermittent starting issues and the presence of smoke or a burning odor under the hood can signal a malfunctioning starter.

Replacing the starter motor is often the most effective solution if it is deemed faulty. Choose a high-quality replacement to guarantee the long-term reliability of the start/stop system.

3. Alternator Failure

The alternator, a vital component of your Jeep’s electrical system, may encounter issues that cause the auto start/stop to stop working. Problems may include:

  • System Failure: A malfunctioning alternator may lead to the auto start/stop not working.
  • Insufficient Charging Voltage: Issues such as a loose belt or broken wires in the alternator can result in inadequate charging voltage for the battery and start/stop system.

How Do You Diagnose and Troubleshoot the Alternator Failure?

Repair or Replace Faulty Alternator

First, thoroughly examine any damage to the alternator. If the alternator is severely damaged, opt for a complete replacement for a reliable solution. Select a quality replacement to guarantee the sustained operation of the start/stop system.

Routine Checks and Maintenance

Regularly check the fan belt for signs of looseness and tighten it as needed. Inspect the alternator’s wiring, connectors, and the battery ground connection for breaks, cuts, and corrosion. If broken wires are detected, repair them to ensure a reliable connection.

4. Wiring Issues

Wiring problems pose a significant threat to the proper functioning of your auto start/stop system, potentially leading to the following:

  • System Malfunction: Problems with the wiring can result in the malfunction of the start/stop system.
  • Failure Due to Damage: Damaged or loose wiring can directly cause the start/stop system’s failure.
  • External Factors: Rodent damage or exposure to moisture can lead to wiring issues.

How Can You Diagnose the Wiring Issues?

Secure Wiring Connections

Verify that all wiring connections are firmly in place and corrosion-free. Regularly inspect and tighten loose connections as part of routine maintenance.

Inspect Thoroughly

Conduct a thorough inspection of wiring for signs of fraying or damage. Take immediate action to fix any frayed or damaged wires to avoid additional problems.

Check Relays and Fuses

Verify the condition of relays and fuses connected to the auto start/stop system. Replace any faulty relays or fuses to maintain the electrical system’s integrity.

5. Sensor-Related Issues

Your auto start/stop system relies on various sensors, such as the brake pedal, accelerator pedal, IBS, and crankshaft position sensors. Problems with these sensors can lead to:

  • Activation Failure: If the brake pedal sensor fails to recognize the brake, the start/stop system may not activate as intended.
  • System Inoperability: Malfunctions in critical sensors like the crankshaft position sensor can render the start/stop system non-operational.
  • Engine Turning Issues: The accelerator pedal and steering wheel sensors play a role in starting or stopping the engine, and malfunctions can disrupt this process.

How Do You Address the Sensor-Related Issues?

Comprehensive Sensor Check

Make sure that all sensors, including the brake pedal, accelerator pedal, IBS, and crankshaft position sensor, are working properly. Regularly inspect sensors for any signs of defects or damages.

Replace if Necessary

If any sensors are malfunctioning beyond repair, opt for a timely replacement to restore the optimal function of the start stop system.

Cleaning and Maintenance

Keep sensors clean and free from dirt or debris, especially the IBS and crankshaft position sensors. Regularly check and clean the sensors to prevent potential malfunctions.

6. Software-Related Issues

The auto start/stop system relies heavily on sophisticated software to determine engine start and stop timings. Software-related problems may include:

  • Engine Control Module Glitch: The auto start/stop feature may not work due to a software error in the engine control module (ECM).
  • Control Module Failure: Unexpected problems may arise if the control module for the auto start/stop system fails.
  • Need for Software Update: Sometimes, a simple software update may be required to address bugs or improve the auto start/stop system’s performance.

How Can You Debug the Software-Related Issues?

Software Debugging

Debugging the software may involve identifying and rectifying glitches in the ECM or ESS control module. Certified mechanics can perform thorough software debugging to resolve specific issues affecting the start/stop system. If you suspect software-related issues, consult a certified mechanic.

Update Software

If a software update is deemed necessary, visiting the dealership is recommended. Dealerships often provide software upgrades to address bugs and enhance the overall performance of the auto start stop system.

7. Environmental Challenges

As the seasons change, especially during winter, your Jeep’s auto start/stop feature may face battery power and temperature challenges. Understanding these issues and implementing solutions is crucial for a smoother driving experience.

Temperature-Related Power Loss: Cold temperatures, especially in winter, can lead to reduced battery power. The auto start/stop feature may disable itself due to insufficient power.

So, How Can You Find Solutions?

Battery Monitoring

Keep an eye on battery power levels, especially in colder months. Regularly check your vehicle for any low battery warnings.

Seasonal Battery Maintenance

Prioritize seasonal battery maintenance, especially before winter. Ensure your battery is at its peak charge to handle the increased demand during cold weather.

By staying proactive in monitoring your battery’s health and performing seasonal battery maintenance, you can mitigate the impact of environmental challenges on your auto start/stop feature. 

8. Parasitic Draw

Discovering the root cause of your auto start/stop system troubles may lead you to a parasitic draw. Understand this issue to restore the proper functionality of your vehicle’s systems.

  • Unintended Battery Drain: Direct wiring to the battery may cause a parasitic draw. In that case, the AUX battery experiences a significant drain, resulting in the Jeep’s auto start/stop not working.
  • Erroneous Disabling of Auto Start/Stop: A parasitic draw may make the AUX battery appear discharged. The auto start/stop may not work due to the perceived low battery, impacting overall vehicle performance.

How Do You Resolve the Issue?

Correct Wiring Configuration

Ensure proper wiring configuration, connecting to the switched ignition instead of directly to the battery. Reconfigure the unit’s wiring to eliminate the parasitic draw.

Voltage Monitoring

Implement a voltage monitoring system. Regularly monitor the AUX battery’s voltage to detect and address any abnormal drops.


Seek professional inspection and assistance. Have a qualified technician examine the vehicle’s wiring, ensuring it aligns with manufacturer specifications and addressing potential parasitic draw issues.

9. Short Trips and Your Start/Stop Woes

Discovering that your auto start/stop feature ceased after short trips but revived during a longer journey indicates a pattern worth exploring. Understand the issues related to short trips and implement solutions to make the auto start/stop work.

  • Insufficient Battery Charge: Short trips may not be enough for the battery to fully recharge. The auto start/stop feature is disabled due to an insufficient charge, impacting its operation.
  • Battery Health Degradation: Frequent short trips can contribute to battery health degradation. The overall performance of the auto start/stop system is affected, leading to inconsistent functionality.

What Should You Do?

Occasional Long Drives

Incorporate occasional longer drives into your routine. Plan longer trips to allow the battery to recharge adequately, supporting the proper function of the auto start/stop system.

Battery Maintenance

Prioritize regular battery maintenance. Ensure your battery is in optimal condition by checking and addressing any issues promptly, potentially extending the life of the auto Start/Stop system.

Utilize Battery Charging Devices

Consider using battery charging devices. Invest in and use battery chargers or maintainers, especially during infrequent or short trips.

If your Jeep’s auto start/stop encounters any issues, don’t hesitate to diagnose and repair it. Whether it’s a battery, sensor, software, or wiring issue, prompt attention ensures the uninterrupted function of your start/stop system. 

10. Other Potential Causes

If you find your Jeep’s start/stop system not engaging, it’s essential to understand the various conditions that may impact its functionality. There can be many reasons for your Jeep’s auto start/stop warning light. Here’s a consolidated list to guide you through potential issues:

Door or Hood Not Closed Properly

Ensure the driver’s seat belt is buckled. Confirm that the driver’s door and hood are securely closed.

Stop/Start Not Ready Hood Open
Stop/Start Not Ready Hood Open Jeep Warning

Sometimes it happens that you have closed the door or hood securely, but still, you may see a “Stop/Start Not Ready Driver Door Open” or “Stop/Start Not Ready Hood Open” warning on your Jeep dashboard. Generally, it is found that the door latch or hood latch is faulty in that case. If you suspect any of these things, replace the faulty latch, and the auto start/stop should function again.

Environmental Factors

Avoid steep grades and extreme environmental conditions affecting cabin temperature and wait to reach an acceptable cabin temperature. Otherwise, you may see the Stop/Start Not Ready Cabin Cooling Or Heating warning, and your auto start/stop system will not work.

HVAC Settings

Manage HVAC settings, avoiding full defrost mode or MAX A/C at high blower speeds.

Engine Operating Parameters

Wait for the engine to reach normal operating temperature before expecting the system to engage. Otherwise, you may see the Stop/Start Not Ready Engine Temperature Too Low warning.

Transmission and Driving Conditions

Ensure the transmission is in forward gear. Avoid situations like high-speed driving or steep descents. 

Vehicle Components and States

Keep the hood closed. Apply sufficient pressure on the brake pedal. Make sure there’s no pressure on the accelerator pedal.

Additional Factors

Maintain a consistent speed and avoid abrupt steering angles. The Adaptive Cruise Control (ACC) being on may affect the system. High altitude and system faults may also impact performance.

Inadequate Oil Pressure

Proper oil pressure is crucial for the engine’s smooth operation and related systems.

Automated Engine Start Conditions

  • The transmission is moved out of DRIVE.
  • Low battery voltage or brake vacuum.
  • Manual interventions like pushing the STOP/START OFF switch.
  • 4WD system engagement in 4LO mode.

While issues like low battery, faulty sensors, or software glitches are commonly discussed factors contributing to start/stop system failure, it’s crucial to be aware of these additional causes. 

How Do You Reset Auto Start/Stop on a Jeep?

If you find the need to reset your Jeep’s auto start/stop system, follow these simple steps:

  1. Understand that the Start & Stop system activates automatically when the car is started, eliminating the need for manual operation.
  2. Open the hood to locate the battery inside the engine compartment.
  3. To reset the system, disconnect the connector at the lower part of the battery. Keep it disconnected for a few seconds before reconnecting.
  4. After reconnecting, verify that the system has been successfully reset.

Alternative Method (IBS Sensor)

Alternatively, you can reset the system by disconnecting the IBS sensor and then reconnecting it.

Always exercise caution when working with the vehicle’s battery and components, and refer to your owner’s manual for model-specific instructions.

Mistakes You Shouldn’t Make to Avoid Jeep’s Auto Start/Stop Not Working Issue

If you’ve noticed your Jeep’s start/stop system behaving oddly, it may be due to some common mistakes you’ve unintentionally made. To ensure your start/stop system functions smoothly, avoid the following errors:

Accidental Disabling

Avoid accidentally turning off the start/stop system. This button is conveniently placed, making it easy to disable unintentionally. Ensure your start/stop feature is activated if you’re experiencing issues.

Ignoring Low Battery Warnings

Don’t ignore warnings about a low battery. The start/stop system relies on a well-charged battery; ignoring warnings can lead to improper system function. Address any low battery warnings promptly to avoid further complications.

Using Incompatible Products

Avoid using oils or fuel incompatible with your vehicle’s requirements. Incorrect products can impact the proper functioning of the start/stop system. 

Neglecting Faulty Sensors

Don’t ignore faulty sensors responsible for detecting idling and engine shutdown. Faulty sensors can disrupt the start/stop system’s effectiveness. If you suspect sensor issues, seek assistance from a qualified technician.

Final Words

Occasional auto start/stop malfunctions can cloud your wonderful Jeep experience. I’ve explored the common culprits behind your Jeep auto start stop not working issue and how you can navigate these challenges.

If your Jeep’s start/stop system throws a glitch, don’t panic. Go through the above-mentioned diagnosis steps. Usually, it happens due to a faltering battery, starter motor issues, software glitches, and user errors. Remember to stay alert for warning signs, like low battery indicators, and address them promptly.

Regular check-ups with a trusted mechanic can save you headaches, especially for your battery and starter. Also, be cautious with user controls, ensuring you haven’t accidentally turned off the system.

Environmental factors matter, too, especially in extreme temperatures. Take your Jeep for a spin, especially on longer drives, to keep the battery healthy.

While Jeep start/stop quirks can be annoying, they’re manageable. Stay on top of maintenance, and pay attention to your vehicle’s signals. Don’t let the start/stop system stop you from enjoying your Jeep adventures!

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