Jeep Start Stop System Not Working : Causes And Solution

Jeep start stop system not working could indicate a problem with the battery, sensor, or wiring. Take your vehicle to a certified technician for diagnostics and repairs. If you own a newer model jeep vehicle, you may have come across the start stop system – a fuel-saving feature that turns off the engine when the vehicle is idling, and restarts it when you step on the gas pedal. While this feature can help to conserve fuel and reduce emissions, it can also cause problems if it fails to work.

Jeep start stop system not working could be caused by a number of issues, such as a low battery, bad sensor, or faulty wiring. Neglecting the problem may lead to more serious issues down the road; therefore, it is important to have a certified technician diagnose and repair the issue.

Common Reasons Why Jeep Start Stop System Not Working

Jeep is widely known for its exceptional performance and off-road capabilities. However, many jeep owners have been encountering issues with their start-stop system not functioning as intended. If you’re among them, you’re probably wondering what may be causing the problem.

Don’t worry, we’ve got you covered! In this blog post, we’ll discuss the most common reasons why the jeep start-stop system is not working, including faulty battery, malfunctioning starter motor, corrosion in battery terminals, wiring issues, and failed sensors.

Faulty Battery

The start-stop system relies on a battery that’s in good condition to function effectively. If the battery is faulty, the system may fail to work as intended.

  • Faulty batteries can cause the start-stop system to fail.
  • A battery that’s more than three years old may struggle to keep up with the demands of the start-stop system, especially in extreme weather conditions.
  • Ensure your battery is properly charged and functionally working.

Malfunctioning Starter Motor

The starter motor plays a significant role in the start-stop system. It operates every time the engine is turned on and off. If the starter motor is faulty, the system may not operate correctly.

  • A malfunctioning starter motor is another potential cause of a failed start-stop system.
  • The circuitry that operates the starter motor could be damaged or disconnected.
  • Make sure that your starter motor is properly working, as a damaged starter motor can keep your engine from starting.

Corrosion In Battery Terminals

The start-stop system’s battery terminals should be free of any corrosion, as this can cause problems with the system’s performance.

  • Corrosion on the battery terminals can cause the start-stop system to fail.
  • Ensure the battery terminals are clean and free of any rust or corrosion.
  • After cleaning, apply some dielectric grease to prevent future corrosion.

Wiring Issues

Problems with the wiring can cause the start-stop system to malfunction.

  • Damaged or loose wiring can lead to the failure of the start-stop system.
  • Wiring problems can be caused by exposure to moisture or damage from rodents.
  • Make sure that all wiring connections are securely attached and not corroded.

Failed Sensors

The start-stop system relies on various sensors to function, such as the crankshaft position sensor. If one or more of these sensors fails, the system may not work correctly.

  • Failed sensors can prevent the start-stop system from working correctly.
  • The crankshaft position sensor is one of the most crucial sensors in the start-stop system.
  • Make sure that all sensors are functioning correctly to ensure that the start-stop system operates at optimal levels.

The start-stop system has become a common feature in many jeeps, but it can malfunction due to various reasons. In most cases, the issue is linked to a faulty battery, malfunctioning starter motor, corrosion in battery terminals, wiring issues or failed sensors.

By keeping the above troubleshooting tips in mind, jeep owners can take proactive measures to address any issues related to their start-stop system and enjoy uninterrupted off-road adventures.

Signs Of A Faulty Jeep Start Stop System

If you’ve been driving a jeep with the start-stop system, it’s likely that you’ve experienced problems with it at some point. The start-stop system is designed to conserve fuel by automatically turning the engine off when the vehicle comes to a stop.

However, many jeep owners have reported issues with the start-stop system not working as intended. Here are the signs that you need to watch out for regarding a faulty jeep start-stop system.

Warning Lights On The Dashboard

One of the most common signs that the start-stop system in your jeep is not working correctly is when warning lights appear on the dashboard. When the system has a fault, it sends an error signal to the jeep’s computer, which then triggers the warning lights.

If you notice any warning lights on the dashboard, it’s essential to have your jeep checked by a certified mechanic. The most commonly reported warning lights related to the start-stop system are the check engine light and the start-stop unavailable light.

Engine Not Turning Off When Vehicle Comes To A Stop

As mentioned earlier, the start-stop system’s primary function is to turn off the engine when the vehicle comes to a stop, and the driver takes their foot off the brake pedal. When the system is working correctly, it will automatically restart the engine when the driver presses the accelerator pedal.

However, if the engine does not shut off when the vehicle comes to a stop, it’s an indication that the start-stop system is faulty and needs to be fixed.

Engine Not Starting Or Taking Longer To Start

Another sign that the start-stop system in your jeep is not functioning correctly is when your jeep refuses to start or takes longer to start than usual. When this happens, you might hear a clicking sound coming from the engine compartment.

This sign can be an indication of a flat battery caused by the start-stop system draining the battery excessively. This issue can be fixed by replacing your battery, but it’s best to have your jeep checked by a mechanic to confirm the cause of the start-up problem.

Unusual Sounds From The Engine Compartment

When the start-stop system is faulty, the engine may produce unusual sounds from the engine compartment. The sounds could range from a grinding or clicking noise to a clacking or rattling sound. These unusual sounds can be an indication of a mechanical failure or an electrical fault related to the start-stop system.

If you experience any of the mentioned signs that indicate a faulty jeep start-stop system, it’s crucial to have your vehicle checked by a professional mechanic. Early detection of any issue can save you time and money on costly repairs down the road.

Troubleshooting Jeep Start Stop System Issues

Are you experiencing issues with your jeep’s start stop system? It can be frustrating, but don’t worry, because in this post, we’ll help you troubleshoot the problem. In this section, we’ll cover the steps you should take to identify the issue, check the battery, inspect the starter motor, check the wiring and connectors, and scan for error codes.

Let’s get started with the first step.

Identify The Issue

To troubleshoot the jeep’s start stop system, you need to identify the issues that are causing the problem.

  • The engine doesn’t start or restart after coming to a stop
  • The “auto start/stop system unavailable” message is displayed on the dashboard
  • The engine starts but the system doesn’t activate or work as expected

If you’re experiencing any of these issues, move on to the next step.

Check The Battery

The battery is a crucial component of the start stop system. If the battery is weak, the system will not function properly.

  • Turn off the engine and open the hood of your jeep.
  • Locate the battery and inspect it for any visible damage, like cracks or leaks.
  • Use a voltmeter to measure the battery voltage. A fully charged battery should read between 12. 6v to 12. 8v.
  • If the voltage is low, recharge or replace the battery as needed.

Inspect The Starter Motor

The starter motor helps the engine to start. If it’s not working correctly, the start stop system won’t function correctly.

  • Turn off the engine and open the hood of your jeep.
  • Locate the starter motor and inspect it for any visible damage, like corrosion or loose connections.
  • Check the cable connections to make sure they are secure.
  • If you suspect the starter motor is faulty, take it to a mechanic for further inspection.

Check The Wiring And Connectors

Wires and connectors are vulnerable to wear and tear.

  • Turn off the engine and open the hood of your jeep.
  • Locate the wiring and connectors and inspect them for any visible damage, like frayed wires or corroded connectors.
  • Check the cable connections to make sure they are secure.
  • If you find any damaged wires or connectors, replace them as needed.

Scan For Error Codes

If none of the steps above fix the issue, you may need to scan for error codes.

  • Use an obd-ii scanner to scan for error codes. The scanner will display any codes related to the start stop system.
  • Note down any error codes and search online for their meaning.
  • Fix the underlying issue indicated by the error code.

These troubleshooting steps should help you diagnose and fix any issues with your jeep’s start stop system.

Diy Jeep Start Stop System Repairs And Maintenance

A malfunctioning start-stop system can be frustrating, especially when driving a jeep. While some emissions-saving systems enhance fuel efficiency, they may come with faults you’d need to fix from time to time. In this post, we’ll discuss diy solutions and maintenance tips for jeep start-stop systems.

Battery And Terminals Maintenance

The start-stop system relies heavily on the battery for efficient operation.

  • Regularly check the battery for wear and tear; replace it at least every three years to keep the system in top shape.
  • Check the terminals and connectors and ensure they’re firmly connected. Loose terminal connections are one of the primary reasons for starting problems in jeeps.
  • Ensure the battery ground cable is properly connected to prevent starting problems.

Cleaning And Replacement Of Sensors

Sensors play a vital role in detecting when to start or stop your jeep engine.

  • Ensure you clean the sensors routinely with a clean cloth or a soft-bristle brush. Note that moisture and debris can accumulate around the sensors, leading to inaccurate readings and stop-start system problems.
  • If the sensors are damaged or worn, replace them immediately. Faulty sensors can disrupt the start-stop system’s operation.

Proper Care Of Wiring And Connectors

The wiring and connectors in your jeep are responsible for linking the sensors to the electronic control module.

  • Routinely clean the connectors with a dry brush or a clean cloth. Clean connectors ensure steady flow of electricity throughout the system and reduce the likelihood of starting problems.
  • Check your wiring regularly for signs of wear and tear. If you notice exposed wires, damp spots, or corrosion, replace them immediately.

Troubleshooting Tips For Minor Faults

Here are some general tips to troubleshoot minor faults that may arise in your jeep start-stop system:

  • If the start-stop system isn’t engaging, check your owner’s manual for the appropriate settings. You may have inadvertently turned off the system manually or changed the settings unknowingly.
  • If the system engages but the engine doesn’t turn off, check if the brake pedal is firmly pressed. The system is programmed to turn off the engine only when the brake is pressed down to a certain limit.
  • Use an obd (on-board diagnostics) scanner to check for codes in the system. Follow the troubleshooting guidelines suggested by the scanner to fix the fault.

Recommended Routine Maintenance

Jeep recommends some routine maintenance practices to keep your start-stop system in great shape:

  • Regularly maintain and inspect your jeep’s components, such as the battery, sensors, wiring, and connectors.
  • Clean the battery terminals and cables routinely, at least once every few months.
  • Check alternator wiring and connections to ensure there’s stable electricity flow throughout the system.

These routine maintenance practices will help you avoid major faults and keep your jeep start-stop system working optimally.

Remember, consistent maintenance is vital to avoid significant issues with your jeep start-stop system. Consider the tips above to keep your jeep’s running smoothly for miles on end.

Professional Repairs Of Jeep Start Stop System

When To Seek Professional Assistance

Owning a jeep with a start-stop system can come with many benefits, such as increased fuel efficiency and decreased emissions. However, it can be frustrating when the system is not working as it should. While some issues can be resolved with a diy approach, others may require professional assistance.

  • The start-stop system is not turning off the engine when stationary.
  • The system is consistently failing to restart the engine.
  • The “engine start-stop unavailable” warning light is illuminated on the dashboard.
  • Any other system malfunctions, such as strange noises or vibrations.

Repair Costs And Warranties

Bringing your jeep to a professional for start-stop system repairs can come with a cost. It is essential to understand the different factors that can impact repair pricing before seeking assistance.

  • The cost can depend on the severity of the problem, the specific parts needed for replacement, and the labor costs.
  • It’s advisable to check if your vehicle has a warranty covering the start-stop system. The warranty may cover some or all of the costs associated with repairs.

Finding A Reliable Repair Shop

Finding a reliable and trustworthy repair shop can be a challenge, but it is crucial for your jeep’s safety and dependability.

  • Do some research on the reputation of different repair shops in your area.
  • Look for shops with certified and experienced technicians who specialize in jeep repairs.
  • Ask for referrals from friends, family, or colleagues who own jeeps or other vehicles.

Maintenance Programs And Options For Jeep Start Stop System

Regular maintenance can help keep your jeep start-stop system in good condition, reducing the chances of system failures.

  • Regular vehicle inspections: routine inspections will help identify any potential issues with the start-stop system and other parts of your jeep.
  • Battery maintenance: the start-stop system relies on a healthy battery to function. Make sure to have your battery tested and inspected regularly.
  • Software updates: manufacturers regularly release software updates that can improve your jeep’s start-stop system functionality. Check with your technician if any available updates can be installed in your jeep.

By having a good understanding of when to seek professional assistance, the cost of repairs, how to choose a reliable repair shop, and maintenance options, you can keep your jeep’s start-stop system in its best shape. Remember, it’s essential to address any issues promptly to avoid potential system failures and keep your jeep running smoothly.


The jeep start stop system is designed to help save fuel and reduce emissions by turning off the engine when the vehicle comes to a stop. However, if it’s not working, it can be frustrating and potentially dangerous. We’ve outlined some common causes and solutions for this problem.

If you’ve tried all of these solutions and your jeep start stop system is still not working, it’s best to take it to your local dealership or mechanic, who can diagnose and fix the issue. Remember to stay safe on the roads and always prioritize the proper functioning of your vehicle’s systems.

Regular maintenance and checks can help prevent issues like this from happening in the first place.

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