Hey guys! Is your 2021 Subaru Ascent giving you the cold shoulder with battery problems? You're not alone! Many Ascent owners have reported similar issues, and we're here to break down what's going on and how to tackle it. Let's dive into the nitty-gritty of 2021 Subaru Ascent battery woes and get you back on the road.

Understanding the Battery Drain

One of the most common complaints about the 2021 Subaru Ascent is unexpected battery drain. This often manifests as a dead battery, especially after the vehicle has been sitting for a relatively short period. Several factors could be contributing to this issue. Let's explore them:

• Software Glitches: Modern cars are essentially computers on wheels. Sometimes, software glitches can prevent systems from fully shutting down, leading to a parasitic drain on the battery. The Ascent, with its advanced features, is no exception. A software update might be necessary to resolve these glitches, ensuring all systems properly power down when the car is turned off. Keep an eye out for any software updates released by Subaru, as these often address known issues.
• Faulty Battery Management System (BMS): The BMS is responsible for monitoring and controlling the battery's charging and discharging processes. If the BMS malfunctions, it can lead to over-discharging or undercharging, both of which can shorten the battery's lifespan and cause unexpected drain. A diagnostic check can determine if the BMS is functioning correctly, and if not, replacing it might be necessary. Ignoring a faulty BMS can lead to more significant problems down the road, so it's best to address it promptly.
• Parasitic Drain from Accessories: Even when the car is off, some accessories can continue to draw power, leading to a parasitic drain. This could be anything from aftermarket electronics to a glove box light that doesn't turn off completely. Identifying the source of the parasitic drain can be tricky but is essential for resolving the issue. A mechanic can use specialized equipment to measure the current draw from different circuits and pinpoint the culprit. Unplug any aftermarket accessories that you're not actively using to minimize potential drain.
• Short Trips: If you primarily use your Ascent for short trips, the battery may not have enough time to fully recharge. This can lead to a gradual decline in battery health and eventually result in a dead battery. Try to incorporate longer drives into your routine to allow the battery to fully charge. Alternatively, you can use a battery maintainer to keep the battery topped up when the car is not in use.
• Defective Battery: Sometimes, the simplest explanation is the correct one. The battery itself could be defective. Manufacturing defects can lead to premature failure, causing the battery to lose its charge quickly. A battery test can determine if the battery is holding a charge properly. If the battery is under warranty, you may be able to get a replacement free of charge.

Common Symptoms of Battery Issues

Recognizing the symptoms of a failing battery is crucial for addressing the problem before it leaves you stranded. Here are some common signs that your 2021 Subaru Ascent might be experiencing battery issues:

• Slow Engine Crank: One of the first signs of a weak battery is a slow engine crank. The engine may take longer to start than usual, and the cranking sound might be weaker. This indicates that the battery is not providing enough power to the starter motor. Pay close attention to how your engine sounds when starting, as this can be an early warning sign of battery problems.
• Dim Headlights: If the headlights appear dimmer than usual, especially at idle, it could be a sign that the battery is not providing enough voltage. The headlights may brighten as you rev the engine, indicating that the alternator is providing some power, but the battery is still weak. Check your headlights regularly, especially at night, to ensure they are shining brightly.
• Electrical Issues: A weak battery can cause a variety of electrical issues, such as flickering lights, malfunctioning accessories, and error messages on the dashboard. These issues can be intermittent and may worsen over time. Keep an eye out for any unusual electrical behavior, as this could indicate a battery problem.
• Frequent Jump Starts: If you find yourself needing to jump-start your Ascent frequently, it's a clear sign that the battery is not holding a charge. This could be due to a parasitic drain, a defective battery, or a problem with the charging system. Frequent jump starts can damage your car's electrical system, so it's essential to address the underlying issue as soon as possible.
• Dashboard Warning Lights: The battery warning light or check engine light may illuminate on the dashboard, indicating a problem with the battery or charging system. These lights should not be ignored, as they can indicate a serious issue. Have your car scanned for diagnostic codes to determine the cause of the warning lights.

Troubleshooting Steps

If you suspect your 2021 Subaru Ascent is experiencing battery issues, there are several troubleshooting steps you can take to diagnose and potentially resolve the problem:

• Battery Test: The first step is to have the battery tested. Most auto parts stores offer free battery testing services. A battery test will determine if the battery is holding a charge properly and if it is capable of providing sufficient power. Bring your Ascent to a trusted mechanic or auto parts store for a comprehensive battery test.
• Check for Parasitic Drain: As mentioned earlier, a parasitic drain can cause the battery to discharge even when the car is off. To check for a parasitic drain, you'll need a multimeter and some basic knowledge of electrical circuits. Disconnect the negative battery cable and connect the multimeter in series between the cable and the battery terminal. With all accessories turned off, the current draw should be very low (typically less than 50 milliamps). If the current draw is higher than this, there is likely a parasitic drain. Consult a professional mechanic if you're not comfortable performing this test yourself.
• Inspect the Charging System: The charging system is responsible for recharging the battery while the engine is running. A faulty alternator or voltage regulator can prevent the battery from charging properly. Have the charging system tested to ensure it is functioning correctly. A healthy charging system is essential for maintaining battery health.
• Check Battery Connections: Corroded or loose battery connections can prevent the battery from charging properly and can also cause a variety of electrical issues. Clean the battery terminals and ensure the connections are tight. Use a wire brush and battery terminal cleaner to remove corrosion.
• Software Updates: Check with your Subaru dealer to see if there are any software updates available for your 2021 Ascent. As mentioned earlier, software glitches can sometimes cause battery drain. Keep your car's software up to date to prevent potential issues.

Solutions and Prevention

Once you've identified the cause of the battery issues, you can take steps to resolve the problem and prevent it from happening again. Here are some potential solutions and preventative measures:

• Replace the Battery: If the battery is defective or nearing the end of its lifespan, the simplest solution is to replace it. Choose a high-quality battery that is specifically designed for your 2021 Subaru Ascent. Consider an AGM (Absorbent Glass Mat) battery, as these batteries are more resistant to vibration and can provide better performance in cold weather.
• Repair or Replace the BMS: If the battery management system is faulty, it will need to be repaired or replaced. This is typically a job for a professional mechanic. A properly functioning BMS is crucial for maintaining battery health and preventing over-discharging or undercharging.
• Address Parasitic Drain: If you've identified a parasitic drain, you'll need to find the source of the drain and repair it. This may involve tracing wires, replacing faulty components, or disconnecting aftermarket accessories. Professional help may be necessary to diagnose and repair complex parasitic drains.
• Use a Battery Maintainer: If you frequently drive short distances or leave your car parked for extended periods, a battery maintainer can help keep the battery topped up and prevent it from discharging. Connect the battery maintainer when the car is not in use to ensure the battery stays fully charged.
• Regular Maintenance: Regular maintenance, such as checking the battery connections, inspecting the charging system, and keeping the battery clean, can help prevent battery issues. Follow the manufacturer's recommended maintenance schedule to ensure your car is running smoothly.

Conclusion

Battery issues in the 2021 Subaru Ascent can be frustrating, but with a little knowledge and some troubleshooting, you can often resolve the problem yourself. Understanding the potential causes, recognizing the symptoms, and taking preventative measures can help you keep your Ascent's battery in top condition. If you're not comfortable performing any of these tasks yourself, don't hesitate to seek the help of a qualified mechanic. Drive safe, guys, and keep those batteries charged!