Jeep Start Stop Not Working : Expert Guide

Jeep start stop not working is a common issue that jeep owners experience. This problem can be caused by a variety of factors, such as a weak battery, a faulty starter motor, or a malfunctioning stop-start system.

If you’re a jeep owner, you’ve probably experienced the benefits of the start-stop system firsthand. This technology automatically turns off your engine when your jeep is idle, reducing fuel consumption and emissions. However, it can be frustrating when the start-stop system doesn’t work as intended. If you’re having trouble with your jeep’s start-stop system, don’t worry. We’ve put together this guide to help you troubleshoot and fix the issue. In this article, we’ll cover the common causes of the jeep start-stop system not working and provide you with step-by-step instructions on how to resolve the problem.

Symptoms Of Jeep Start Stop Not Working

Jeep start stop is an innovative feature that saves fuel by shutting off and restarting the vehicle’s engine whenever the vehicle is in idle mode. However, if you notice that your jeep start stop is not working as intended, it might be an indication of a problem.

Engine Stalling

One of the common symptoms of jeep start stop not work is engine stalling. The engine might shut off completely when the vehicle comes to a stop, and the start stop feature is enabled. This situation can be dangerous, especially when driving at high speeds, making it essential to have your jeep checked.

Car Not Restarting

If the engine fails to restart after the stop start feature shuts it off, it might be an indication of an issue in the jeep’s electrical system. Some possible causes could be a dead battery or a faulty starter, which can require expert assistance to resolve the issue.

Unusual Noises

Another symptom of jeep start stop not work is if you hear unusual noises from the engine. If you hear any clunking, grinding, or screeching noises while the engine is running, you should take your jeep to a mechanic for inspection.

Battery Drain

Jeep start stop not work can lead to significant battery drain since the vehicle won’t be able to recharge the battery like it usually does. If you notice that your battery is draining more quickly than usual, it could be time to schedule a service appointment for your vehicle.

Check Engine Light

If the check engine light is on, it is an indication that something is amiss in your jeep’s start stop system. This could be due to several reasons, including a faulty sensor, an electrical problem, or an issue with the fuel injector.

A mechanic can conduct a diagnostic test to identify the underlying issue.

If you notice any of the above symptoms or anything unusual with your jeep’s start stop feature, it is best to take your vehicle to a professional mechanic. They can diagnose and resolve any issues to get your jeep running smoothly once again.

Causes Of Jeep Start Stop Not Working

The jeep start-stop system is designed to conserve fuel and reduce emissions by automatically turning off the engine when the vehicle comes to a stop. However, drivers often find that the jeep start-stop feature may not work correctly.

Faulty Battery

A faulty or weak battery can cause the jeep start-stop system to malfunction. A start-stop system demands more power from the battery than an ordinary electrical system, and a failing battery cannot provide the required power. If the battery capacity is low, the jeep may shut down the start-stop system to prolong battery life.

Malfunctioning Alternator

A faulty alternator can also cause the jeep start-stop system to stop working. The alternator charges the jeep battery, and if it malfunctions, the battery’s power level is not replenished, making it incapable of running the start-stop system. An experienced mechanic can easily determine if the alternator is faulty and replace it if necessary.

Loose Wiring Or Battery Terminals

If the battery or its terminals are loose, the start-stop system may not work correctly. Loose wiring can cause the battery to lose power intermittently, causing the jeep to shut down the start-stop system to avoid battery drain. A certified technician can easily fix this issue by inspecting the battery and tightening the terminals.

Issues With Start-Stop System Sensors

Start-stop systems are linked to different sensors in the vehicle, including the brake pedal sensor, accelerator pedal sensor, and steering wheel sensor. If any of these sensors malfunction, the start-stop system may not work. When the brake pedal is pressed, the start-stop system should activate, but if the system’s sensor does not recognize the brake, the feature will not work.

The same applies to the accelerator pedal sensor, which signals the start-stop system to start or stop the engine. The steering wheel sensor signals the jeep to turn the engine back on if the driver turns the steering wheel.

It is not uncommon for the jeep start-stop system to stop working due to any of the above reasons. If you experience any issues with the feature, contact a certified mechanic who can diagnose the problem and provide the appropriate solution.

Troubleshooting Jeep Start Stop Not Working

Jeep’s start stop system not working can be frustrating, especially if you’re looking to save on fuel costs. When the system fails, you may experience issues with the engine not turning off, leading to wasted fuel and potential damage to the engine.

In this blog post, we will explore the most common issues with jeep’s start stop system and how to troubleshoot them.

Checking The Battery Voltage

The most common cause of a start stop system not working is a dead or low battery.

  • Turn off the engine.
  • Open the hood and locate the battery.
  • Use a voltmeter to check the voltage of the battery.

If the battery voltage is low, you may need to recharge or replace the battery. It’s important to keep in mind that a weak battery can also cause issues with the alternator, which we will discuss further below.

Inspecting The Battery Terminals And Wiring

The next step is to inspect the battery terminals and wiring:

  • Turn off the engine and open the hood.
  • Inspect the battery terminals for corrosion or damage.
  • Check the wiring to ensure it’s not frayed or damaged.

If there is corrosion or damage to the terminals, use a wire brush to clean them. If the wiring is damaged, it may need to be replaced. It’s important to note that loose connections can also cause issues with the start stop system, so make sure everything is secure.

Evaluating The Alternator

The alternator is responsible for charging the battery and powering the vehicle’s electrical system. If the alternator is not functioning correctly, it can cause issues with the start stop system.

  • Turn off the engine and open the hood.
  • Use a voltmeter to check the voltage of the battery while the engine is running. The voltage should be between 13. 5 and 15. 5 volts.

If the voltage is not within this range, the alternator may be faulty and need to be repaired or replaced.

Analyzing Start Stop System Sensors

The start stop system uses sensors to determine when to shut off the engine and when to start it again. If the sensors are malfunctioning, it can cause issues with the start stop system.

  • Use a code reader to check for any error codes in the system.
  • Inspect the sensors for damage or disconnection.

If there are error codes, they can help pinpoint the issue. If the sensors are damaged or disconnected, they may need to be repaired or replaced.

Troubleshooting jeep’s start stop system not working can save you from a lot of headaches caused by unnecessary fuel usage. By following these steps to check the battery voltage, inspect the battery terminals and wiring, evaluate the alternator, and analyze the start stop system sensors, you can identify and resolve most common start stop system issues.

How To Fix Jeep Start Stop Issue

Jeep’s start stop feature is a convenient way to save fuel and reduce emissions, especially in heavy traffic. However, if you own a jeep and experience problems with this feature, it can be frustrating. In this section, we’ll look at possible ways to fix a jeep start stop issue, including repairing battery connections, replacing the battery, fixing alternator issues, and fixing or replacing start stop system sensors.

Repairing Battery Connections

Sometimes, the issue might simply be inadequate battery connections. If you observe that the battery terminals are corroded or loose, it’s advisable to clean them. Cleaning the battery terminals enhances the electrical connection between the battery and the start stop system, which is necessary for the proper functioning of the feature.

  • Disconnect the battery cables
  • Spray terminal cleaner on both of the battery posts and cable terminals to remove any dirt or corrosion buildup.
  • Use a wire brush to remove any remaining debris.
  • Reconnect the cables to the terminals, starting with the positive cable.

Replacing The Battery

If your jeep’s battery is weak or dead, the start stop feature might not work correctly. A weak battery can’t provide the required power to other systems. Thus, it’s essential to replace the battery to ensure the start stop feature’s smooth operation.

  • Remove the battery cover and terminal protectors.
  • Disconnect the negative (-) cable before disconnecting the positive (+) cable.
  • Remove the battery hold-downs using a wrench or socket, and gently remove the battery from the tray.
  • Clean the battery tray and install the new battery.
  • Finally, reconnect the battery terminals, starting with the positive cable.

Fixing Alternator Issues

The alternator plays a crucial role in the overall functioning of the jeep’s electrical system. Suppose there’s an issue with the alternator, such as a loose belt or a broken wire. In that case, it may be unable to provide enough charging voltage to the battery and start stop system.

  • Check and tighten the fan belt if it appears loose,
  • Check the alternator’s wiring, connectors, and the battery ground connection for breaks, cuts, and corrosion.
  • If you find any broken wires, have them repaired by a professional.
  • In case of a severe issue, replace the alternator with a new one.

Fixing Or Replacing Start Stop System Sensors

The jeep’s start stop feature relies on various sensors, including the battery sensor, brake pedal sensor, hood switch sensor, and more. If any of these sensors are faulty or damaged, the start stop feature might fail to work correctly. Depending on the extent of the damage, you’ll need to either fix or replace the sensor. Contact a professional mechanic to help with this task.

Fixing the jeep start stop issue is possible, provided you understand its potential causes. It’s essential to start with the most basic and simple fixes before considering more complex solutions. Remember to perform regular maintenance on your jeep to keep your start stop feature working optimally.


The jeep start-stop feature can be a real lifesaver when it works correctly. Unfortunately, like any other vehicle feature, it can malfunction and add to the frustration of driving. Several factors can cause the jeep start-stop not to work, including a failing battery, faulty starter, or software failure.

However, the good news is that the problem is never too far beyond repair, as the diagnosis and replacement of the faulty parts are easily done with the aid of a professional mechanic. Overall, a jeep malfunction can be inconveniencing and time-consuming, but with proper maintenance, you can enjoy driving your jeep without any unnecessary delays.

Finally, regular servicing and maintenance of your jeep guarantees the safety of the driver, passengers, and other road users. So, it’s paramount to address any signs of issues immediately to keep your vehicle in good working condition.