Chrysler Pacifica Auto Start Stop Warning Light

The Chrysler Pacifica's Electronic start-stop mechanism aims to reduce your fuel station visits by automatically shutting off the engine during extended periods of idleness, such as prolonged waits at traffic lights or while picking up passengers.

Sometimes, this feature can shift from being helpful to somewhat bothersome. This is particularly evident when it activates the "Auto Start Stop" alert on the dashboard, a problem we're addressing in this article.

Essentially, the start-stop warning indicator in the Pacifica can be set off by several factors, including a drained main or auxiliary battery, issues with the battery management system, software malfunctions, or simply unfavorable weather conditions. Below, we detail each of these potential causes for better understanding.

Read: Chrysler Auto Start Stop Warning Light

What is the Chrysler Pacifica Auto Start Stop Warning Light?

A description of the warning light specific to the Chrysler Pacifica's automatic engine start-stop feature.
A description of the warning light specific to the Chrysler Pacifica's automatic engine start-stop feature.

The Auto Start-Stop System, also known as the Idle Stop-Start System (ISS) or Micro Hybrid Technology, is a fuel-saving technology that automatically turns off an unused engine. It works by shutting down the machine after the vehicle has come to a complete stop and restarting it when required. This system is designed to reduce emissions and improve fuel economy, resulting in cost savings for vehicle owners.

When your car comes to a stop at a red light or in traffic queues, this system will sense the change in speed and shut off your engine automatically. Once you press the accelerator pedal again, however, the system will detect this movement and automatically start up your machine again so you can drive away from where you stopped. For this technology to work optimally, there must be enough charge left on your battery for your car’s starter motor to kick into action when needed; otherwise, some additional energy may be necessary before driving away from where you stopped.

This Auto Start-Stop System helps improve overall efficiency on short trips around town and long highway drives since it cuts out unnecessary idling time during stops, reducing fuel consumption significantly over time. The reduced strain on components such as spark plugs due to fewer starts also increases their useful life span, further improving consumer cost savings. Improved air quality due to lower emissions of pollutants like nitrogen dioxide (NO2) associated with idling engines also makes this auto start-stop system beneficial beyond its original intent of reducing fuel costs alone, making it an attractive feature, especially among eco-conscious drivers today!

The Chrysler Pacifica Auto Start Stop Warning Light is a feature that helps to improve fuel economy by automatically shutting off the engine when the vehicle is not in use. The light will come on when the engine is turned off and stay on until the car moves again. This is a great feature for those looking to save money on fuel costs, but it cannot be very clear for some drivers. Here's what you need to know about the Chrysler Pacifica Auto Start Stop Warning Light.

What does it mean when the Chrysler Pacifica Automatic Start Stop Warning Light comes on?

Common reasons why the auto start-stop warning light may illuminate in a Chrysler Pacifica.
Common reasons why the auto start-stop warning light may illuminate in a Chrysler Pacifica.

Your Chrysler Pacifica auto start-stop system is designed to switch off the engine when unused. This feature helps avoid unnecessary idling. For instance, if you're halted at a red light for around a minute, the system will shut down the engine.

The engine reignites as soon as you lift your foot from the brake. This method is an effective way to save fuel. More importantly, it's aimed at reducing your car's emissions, contributing to environmental protection.

The significance of this feature usually goes unnoticed unless it fails to function properly. A common issue could be your Pacifica not starting when required, which can be a source of stress and inconvenience, potentially causing traffic delays.

This system also places stress on your vehicle's battery. Despite being an EFB or AGM type, these batteries have a finite number of short-duration engine starts before their performance declines.

🚨You may be interested in: Chrysler Gas Cap Warning Light

Most Common Causes of the "Auto Start Stop" Warning Light in the Chrysler Pacifica

In more ways than one, the Auto Start Stop Warning Light does nothing to your vehicle in terms of performance. If you're lucky enough, it might be gone the next time you restart your engine.

However, it is always on or is intermittently popping up. In that case, one of these may be activating the light:

Diagnosing Battery Issues

The process of identifying battery-related problems that can trigger the warning light in the Chrysler Pacifica.
The process of identifying battery-related problems that can trigger the warning light in the Chrysler Pacifica.

When encountering issues with your Pacifica's start-stop system, the battery should be your initial inspection point. A telltale sign is the start-stop warning light, symbolized by an encircled 'A' with an exclamation mark beside it, indicating a need for system service.

Start by examining the battery. In vehicles with a singular battery for the start-stop system, assess the voltage during ignition. A reading under 11.5 volts under load suggests the need for a replacement. Note that Chrysler vehicles equipped with this system necessitate AGM or EFB batteries, not standard car batteries.

If your battery is older than 4 years, consider bypassing the check and opting for a replacement, as their lifespan rarely exceeds this duration.

Remember, newer Pacifica models might have both main and auxiliary batteries, and either can activate the warning light. Both batteries should be inspected if there are issues with the start-stop system.

For those with a mild-hybrid setup, it's crucial to evaluate the health of the second battery. In such cases, visiting a Chrysler dealership for a professional inspection is highly recommended.

🚀Recommended article: Chrysler Battery Warning Light

Just inappropriate conditions

The Chrysler Pacifica's start-stop system operates under specific conditions. A low battery voltage, already discussed, can affect its functionality.

Additionally, the system may not engage if there's a significant temperature disparity between the car's interior and exterior. Since the engine's stop halts the AC compressor, the vehicle may avoid shutting off the engine if the AC is in use during high external temperatures.

Similarly, the system may keep the engine running if it hasn't reached the optimal temperature, preventing the start-stop function from activating. During this time, the start-stop warning light may be illuminated.

These scenarios don’t necessarily indicate a severe problem; they might signal that the auto start-stop feature is temporarily unavailable.

The EVIC display in your vehicle can offer further insights into the cause of the warning light.

💥See also: Chrysler Traction Control (Tc) Warning Light

Intelligent Battery Sensor Malfunction

An issue in the Chrysler Pacifica where the sensor monitoring battery health malfunctions.
An issue in the Chrysler Pacifica was where the sensor monitoring battery health malfunctioned.

Newer Pacifica models are equipped with the Intelligent Battery Sensor (IBS), an integral part of the battery management system. It monitors the main and auxiliary batteries, informing the start-stop system about the battery’s condition and readiness for engine stoppage.

This sensor can malfunction due to overheating or water damage, a problem particularly noted in the Chrysler Pacifica 4xe.

In most instances, a trip to the dealership is advisable for sensor inspection or replacement, potentially covered under warranty. While there may not be any current service bulletins, their future release is plausible.

If the warranty period has elapsed, purchasing and installing a new sensor is an option. However, those needing more technical expertise should consider seeking professional assistance for the installation.

Wiring Issues

Potential wiring problems in the Chrysler Pacifica that can lead to auto start-stop system warnings.
Potential wiring problems in the Chrysler Pacifica that can lead to auto start-stop system warnings.

If the Chrysler Pacifica Auto Start Stop warning light is active, it could signal wiring issues. Diagnosing these problems typically involves visual checks and the use of a multimeter.

Handling the Pacifica's intricate wiring systems requires specific expertise and experience. It's essential to meticulously inspect for continuity and resistance and watch for corroded terminals and connections that can cause erratic signals.

Paying attention to the ground connection is crucial, as it's known to impact the start-stop system in Chrysler vehicles.

Due to the complexity and potential risks, wiring inspections and repairs should be entrusted to a professional. Improper handling could result in severe and costly damage.

ECU Error

An error in the Engine Control Unit that can cause the auto start-stop warning light to activate in the Chrysler Pacifica.
An error in the Engine Control Unit can cause the auto start-stop warning light to activate in the Chrysler Pacifica.

The Electronic Control Unit (ECU) in a vehicle is a computer that oversees engine functions, including the air-to-fuel ratio and ignition timing, for optimum engine performance. It also influences other systems, affecting the start-stop mechanism.

Issues with the ECU can trigger the "Auto Start Stop" warning light or other alerts on the Pacifica's dashboard. An ECU problem might prevent the engine from restarting after a stop, activating the warning system. However, the vehicle will still be drivable.

Sometimes, these issues are just minor ECU glitches. A common fix is disconnecting the 12V battery for 5-10 minutes, allowing the car's "brain" to reset and clear any errors. After reconnecting the battery, the vehicle might function normally again, with the start-stop system back in operation.

📢Read also: Chrysler Temperature Warning Light

Can you drive with the Start Stop warning light?

Operating your Chrysler Pacifica is feasible even if the start-stop system isn't functioning. Most models allow you to disable this feature manually. However, it's crucial to recognize the underlying issue indicated by the warning light. It may signal that the start-stop system is inactive due to environmental factors.

Identifying and resolving the cause of the malfunction is important. The issue could stem from the battery, its sensor, or potentially a software glitch. Addressing this promptly is vital to prevent further complications with your vehicle.


The start-stop system in the Chrysler Pacifica plays a significant role in enhancing fuel efficiency and reducing emissions, particularly in urban settings. It's advisable to keep this feature active. Nevertheless, encountering a warning light related to this system is common for Pacifica owners.

It can be disregarded if the warning light activates due to specific conditions like weather or air conditioning settings. But in other scenarios, it could indicate a more serious issue needing immediate attention.

Should you struggle to diagnose the problem yourself, it's recommended to schedule a visit to a Chrysler dealership or a reputable independent repair shop.

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  1. The auto start/stop on my 2021 Chrysler Pacifica message comes on and indicates that the battery is not charging. The warning light does not come on. I've had my van in 3 times to ge fixed. The auto start/ stops works for about 3 or 4 days then it stops working.

    • Sorry to hear about your recurring issue with the auto start/stop function on your 2021 Chrysler Pacifica. If the system is indicating that the battery is not charging, there might be a few potential reasons. Please consider the following:

      Battery Condition: If the battery is old, not in a good condition, or doesn't have sufficient charge, the auto start/stop function may not work correctly. Even if a battery isn't old, it can still develop problems if it's been drained completely or near-completely multiple times.

      Alternator Issue: The alternator might not be charging the battery as it should. This would mean the battery isn't at fault, but the alternator is. A faulty alternator can be diagnosed by a mechanic.

      Software/Firmware Issue: There may be a software or firmware glitch in the vehicle's systems that control the auto start/stop functionality. This might be resolved by a software update provided by Chrysler, if available.

      Sensor Issue: If any of the sensors that the auto start/stop system relies on are faulty, the system might not work properly. A comprehensive diagnostic test can help identify if this is the problem.

      Specific Requirements Not Met: Remember that certain conditions need to be met for the start/stop system to engage: the battery must be adequately charged, the engine must be warmed up, the outside temperature must be in a certain range, etc. If these aren't met, the system might not function as expected.

      As you have already taken the vehicle in for repair several times, it might be helpful to discuss these specific areas with the service technician. Ask them to particularly investigate the health of the battery and alternator, and to check for any software or sensor issues.

      Remember, persistent issues might be a sign of a manufacturing defect. If you're in the United States and your vehicle has been in for the same repair multiple times without success, you might want to look into your state's Lemon Laws for recourse. In any case, keep a record of all repair attempts and communicate your concerns to Chrysler directly if necessary.

  2. My 2019 Pacifica had the auto start/stop warning about a month ago. Autozone read the codes and it was a simple esim error. I replaced it and had no problems since, until yesterday. The warning came on again but this time they are unable to get a code when the plug in for diagnosis. The system shows no faults/error messages. Kinda hard to make a repair without knowing what is wrong. Do you have any thoughts/suggestions?
    Thanks for the help.

    • Sure, I'd be happy to help you troubleshoot this issue.

      The Auto Start-Stop feature in your Chrysler Pacifica is managed by a network of sensors and modules that communicate with each other. If one of these components is not functioning correctly, it can cause the warning light to come on, even if no diagnostic trouble codes (DTCs) are being shown.

      Here are a few things you can check:

      1. Battery Health: The Auto Start-Stop feature relies heavily on the battery. If the battery is old or weak, it might not be able to provide the necessary power for this system to function correctly, causing the warning light to illuminate. You can have the battery tested at Autozone or any other auto parts store.

      2. Alternator: The alternator also plays a significant role in providing power to the system. If it's not functioning correctly, it can cause the warning light to come on.

      3. Faulty Sensors: There might be an issue with one of the sensors that the Auto Start-Stop system relies on, such as the brake pedal sensor or the transmission sensor. If these sensors are faulty, they might not be able to send the correct information to the system.

      4. Software Update: In some cases, a software update to the vehicle's computer systems might resolve the issue. You could ask your dealer if there are any available updates for your vehicle.

      5. Transmission Fluid: Low transmission fluid levels can cause issues with the Auto Start-Stop system. Check to see if your vehicle's transmission fluid level is within the recommended range.

      If you've gone through all of these checks and still haven't found the issue, I recommend taking your vehicle to a Chrysler dealership or a certified mechanic for further investigation. They have specialized diagnostic tools that can help determine what's causing the warning light to come on. I hope this helps, and please let me know if you have any other questions!

  3. I have a 2019 Chrysler Pacifica that has been having trouble with the Auto Stop/Start system. The warning light comes on a lot and it keeps draining the battery. I'm on my 3rd 12 volt battery in 3 years. And I've had to replace the main battery twice in 3 years also. I've taken it to a Chrysler dealership and they also couldn't fix it. I've emailed @Chrysler Cares and they haven't responded. So does this mean I'm stuck with a vehicle that cant be fixed? Of all the vehicles I've purchased, this is by far the absolute worse choice I've ever made!!

    • I'm sorry to hear about the issues you're experiencing with your 2019 Chrysler Pacifica. The Auto Stop/Start system is designed to save fuel and reduce emissions, but if it's malfunctioning, it can indeed cause issues like the ones you've described.

      Here are a few suggestions and potential solutions:

      1. Battery Quality: Ensure that the batteries you're using, both the 12-volt and the main battery, are of high quality and are recommended for your specific vehicle model. Sometimes, using a non-recommended battery can cause issues.

      2. Software Update: Sometimes, vehicle issues can be resolved with a software update. Ask the dealership if there are any updates available for your vehicle's computer system.

      3. Bypass the System: Some owners choose to bypass the Auto Stop/Start system altogether. There are aftermarket devices and methods to disable the system, but be aware that doing so might affect your vehicle's fuel efficiency and emissions. Also, make sure it's legal in your jurisdiction.

      4. Seek a Second Opinion: If the dealership you visited couldn't resolve the issue, consider visiting another Chrysler dealership or a reputable independent mechanic who has experience with Chrysler vehicles.

      5. Consumer Protection: If the vehicle continues to have unresolved issues, you might want to look into your rights under the Lemon Law or similar consumer protection laws in your jurisdiction. These laws are designed to protect consumers from vehicles that have repeated, unfixable issues.

      6. Document Everything: Keep a detailed record of all the issues, repairs, and communications related to the problem. This can be helpful if you decide to pursue a legal solution or if Chrysler decides to issue a recall or service bulletin in the future.

      Remember, while it's frustrating to deal with recurring vehicle issues, you're not alone. Many vehicle owners face challenges, and there are resources and avenues available to help you find a solution.

    • I currently have a 2019 Chrysler Pacifica. Auto on/off dash light with the exclamation point is on. Replaced main and aux batteries at the same time. Still getting warning light. Were you able to solve the issue?? Not looking forward to paying $200 just for dealership to run error codes 😕

  4. oil checks out, car runs fine with the exception of the auto start/stop light being on, how long can I drive the car before it's a problem?

    • Thank you for reaching out with your concern regarding the Chrysler Pacifica Auto Start Stop Warning Light. It's good to hear that your oil checks out and the car runs fine otherwise.

      The Auto Start Stop Warning Light on your Chrysler Pacifica is designed to inform you of potential issues with the vehicle's auto start/stop system. This system is primarily intended to save fuel by automatically turning off the engine when the vehicle is stationary, such as at a red light, and restarting it when you're ready to move again.

      If the light is illuminated, it suggests that there might be an issue with the system. The article mentions a few steps to take if the light comes on:

      1. Check the Oil Level: You've already done this, and it's great that it checks out.
      2. Inspect Battery Terminals: Ensure they are clean and free from corrosion. Dirty or corroded terminals can affect the system's performance.
      3. Check the Fuse Box: Look for any blown fuses and replace them if necessary.

      Given that your car runs fine otherwise, it's possible that the issue is minor. However, the auto start/stop system is a complex feature that interacts with various components of your vehicle, from the battery to the engine itself.

      To address your specific question about how long you can drive the car before it becomes a problem: While the vehicle might run fine for now, it's always a good idea to address warning lights sooner rather than later. Even if the car feels okay, there could be underlying issues that might worsen over time or lead to other complications.

      I would recommend scheduling a visit to a qualified technician or your dealership to have the system inspected. They can provide a more accurate diagnosis and ensure that your vehicle remains in optimal condition. Safe driving!


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