Do subarus have problems with batteries?

Subarus are not unusually prone to battery failures compared with other mainstream brands. The most common issues involve aging 12‑volt batteries, cold‑weather strain, and, in hybrid models, the high‑voltage battery. With proactive maintenance and timely replacement, most owners experience reliable starting and electrical performance.

Common 12-volt battery issues in Subaru models

Symptoms and typical causes

Because the 12‑volt battery powers the starter, lights and control modules, signs of trouble can include slow or labored starting, dim headlights, or warning indicators on the dash. The list below covers the issues most frequently reported by Subaru owners and what tends to cause them.

• Premature battery failure due to aging (roughly 3–5 years depending on climate and driving habits).


• Parasitic drain from accessories or aftermarket devices when the vehicle sits unused for extended periods.


• Cold-weather starting difficulties caused by reduced battery capacity and slower chemical reactions in low temperatures.


• Corroded or loose battery terminals that impair charging and electrical connections.


• Alternator or voltage‑regulator issues that lead to undercharging or irregular charging voltage.


• Electrical system quirks or software updates that can temporarily affect battery state awareness or charging behavior.

In short, these issues are typically routine maintenance matters rather than systemic design flaws, and they are manageable with timely testing and replacement.

Hybrid and high-voltage battery considerations

Understanding the high‑voltage pack in Subaru hybrids

Subaru’s hybrid models (such as Crosstrek Hybrid) use a high‑voltage battery pack to assist the internal combustion engine. These packs are designed for longevity, but all HV batteries degrade gradually with use and heat. Symptoms can include reduced electric assist, slower charging, or changes in overall efficiency. Warranty coverage for HV batteries is substantial but varies by market and vehicle age.

Before diving into specifics, here are the main HV battery considerations for Subaru hybrids:

• Gradual degradation reduces electric-only capability and overall efficiency over time.


• Thermal management is important; extreme heat or poor cooling can accelerate wear.


• High replacement costs are possible, but many markets offer extended warranty coverage on HV packs.


• HV battery failures are relatively uncommon; more often drivers notice a gradual drop in performance or range.


• Regular dealer inspections help catch issues early and ensure proper cooling and charging operation.

Regular servicing and attention to warranty terms can help maximize HV battery life and minimize unexpected failures on hybrid models.

Maintenance tips to extend battery life

Best practices for Subaru battery health

Extending the life of both 12‑volt and high‑voltage battery systems involves routine checks and mindful driving habits. The following steps are practical ways to reduce surprise outages and costly replacements.

1. Schedule regular 12‑volt battery tests, especially before winter and after a few years of service. A healthy resting voltage is typically around 12.6 volts; charging voltage when running should be in the 13.8–14.4 volt range.


2. Plan for 12‑volt battery replacement roughly every 3–5 years, depending on climate, driving patterns, and accessory load.


3. Keep terminals clean and dry; remove corrosion with a baking soda solution and ensure connections are tight.


4. Use a battery maintainer or trickle charger if the car will be parked for extended periods (weeks rather than hours) in cold weather.


5. Avoid frequent short trips that prevent the alternator from fully recharging the battery.


6. Install OEM or high-quality equivalent batteries and follow the manufacturer’s recommendations for replacement procedures.


7. For hybrids, follow the dealer’s service intervals for HV battery checks and cooling system maintenance, as advised in the owner’s manual.


8. If you notice rapid onset of starting problems, a clicking noise, or warning lights related to the battery or charging system, have the vehicle tested promptly.

Sticking to these habits won’t guarantee invulnerability to battery issues, but it significantly reduces the likelihood of unexpected failures and can extend overall battery life.

Recalls, service campaigns, and how to verify issues

Staying informed about battery-related notices

Subaru, like other manufacturers, occasionally issues recalls or service campaigns that involve electrical components or battery charging systems. The most reliable way to know if a vehicle is affected is to check the VIN against official recall databases and contact a Subaru dealer for confirmation.

To stay informed, consider these steps before a potential service visit:

• Check for active recalls using the vehicle’s VIN on official sites (such as a national recall database) or the Subaru owners portal.


• Ask the dealer to search for any service bulletins related to the 12‑volt system or battery charging that could apply to your model year.


• If a recall or campaign is identified, schedule the service promptly to have repairs performed at no charge when applicable.


• For used-car buyers, request a recall history printout and verify any outstanding service campaigns before completing the purchase.

Being proactive about recalls and service campaigns helps prevent battery-related breakdowns and ensures your Subaru remains reliably powered.

Summary

Battery issues in Subarus mirror those found in many modern vehicles: aging 12‑volt batteries, cold‑weather strain, and occasional high‑voltage pack concerns on hybrids. Most problems are manageable with timely testing, replacement, and preventive maintenance. Hybrid models bring an additional layer of complexity and higher replacement costs, but warranties are typically substantial. Staying informed about recalls and following manufacturer guidance can keep batteries functioning smoothly and help you avoid unexpected outages on the road.

Do subarus have electrical problems?

Yes, Subarus can have electrical problems, though they are generally known for reliability. Common issues include dead batteries, faulty alternators, infotainment system glitches, and problems with power windows and locks. Some model years have been associated with more issues, and there have even been class-action lawsuits related to excessive battery drain. 
Common electrical issues

• Dead battery/Battery drain: This is a frequent complaint, often linked to the short-trip driving pattern or other parasitic electrical drains. 
• Infotainment system problems: Owners report issues like the system freezing, the screen going black, and problems with Bluetooth or Apple CarPlay connectivity. 
• Power windows and locks: Malfunctions such as windows not closing or the remote key fob not working reliably are reported by some owners. 
• Alternator and starter issues: These can lead to dimming lights, a dead battery, or a car that won't start. 
• Other electrical problems: This can include faulty light switches, issues with the Starlink system, and problems with warning lights on the dashboard. 

What to do

• Address minor issues first: If you have a dead battery, check for simple solutions like a replacement or look for parasitic drains. 
• Consult the dealer: For persistent or more complex problems, a Subaru dealer can diagnose and fix issues, sometimes under warranty. 
• Check for recalls: If your vehicle has a recall related to a known issue, bring it to the dealership for a free repair. 

What is the Subaru battery lawsuit about?

The lawsuit alleges that Subaru has violated customer statutes and breached warranties, but Subaru denies these claims. They believe vehicles are not defective and, in many cases, have been replacing potentially defective batteries and provided warranty coverage when appropriate.

What is the most common issue with Subaru?

The most common Subaru problems include issues with head gaskets, oil consumption, and transmission problems, particularly with older EJ engines and certain first-generation CVTs. Other frequent issues involve timing belt failures, electrical faults, and suspension wear. Many of these issues are more prevalent in specific older model years, though newer models can still experience problems like transmission wear.
 
This video discusses common issues with Subaru engines and transmissions: 58sThe OCD RepairmanYouTube · Jul 7, 2025
Engine and powertrain problems 

• Head gasket leaks: This is a notorious issue, especially in older models with EJ series engines, and can lead to coolant leaks, overheating, and other engine damage. 
• Engine oil consumption: Some models consume excessive oil, often due to worn piston rings or valve seals. 
• Timing belt failures: A failing timing belt can cause severe engine damage, and replacement should be done according to the manufacturer's schedule. 
• Transmission problems: Issues like slipping gears or rough shifting have been reported, particularly in some first-generation Lineartronic CVTs and certain models with higher torque loads. 

Other common issues

• Electrical issues: Various components can have faults, including sensors, alternators, and starters. 
• Suspension problems: Suspension components can wear out over time, leading to excessive noise, vibration, and poor handling. 
• Defective airbags: Some model years have had issues with airbags. 
• Faulty fuel pumps: Problems with fuel pumps have been reported in some models. 
• Weak windshields: Some owners have complained about the durability of the windshields. 

Tips to mitigate problems

• Perform regular maintenance: Consistent oil changes, fluid checks, and other scheduled maintenance can help prevent many issues and extend engine life. 
• Replace the timing belt on schedule: Adhering to the manufacturer's recommended timing belt replacement interval is crucial to avoid catastrophic engine damage. 
• Be mindful of specific model years: Researching specific model years for known problems can help you make a more informed decision, especially when buying used. 

What is the average life of a Subaru battery?

Subaru batteries typically last between 3 to 5 years, but this can vary depending on factors like climate, driving habits, and the type of battery. To maximize lifespan, it is important to have your battery regularly inspected and to be aware of signs of a failing battery, such as slow electrical functions or a rotten egg smell.
 
Factors that influence battery life

• Climate: Extreme heat and cold can both shorten a battery's life. Hot weather can cause fluid evaporation, while cold weather makes batteries work harder. 
• Driving habits: Frequent short trips limit the time for the alternator to fully recharge the battery, which can lead to premature depletion. 
• Electrical load: Modern cars with advanced electronics, like driver-assist systems and heated seats, place greater demand on the battery. 
• Battery condition: A battery that is not tightly fastened can be damaged by vibrations. 

Signs of a failing battery

• Slow or malfunctioning electrical components (like lights) 
• A strange or "rotten egg" smell coming from the battery 
• A build-up of corrosion (an ash-like substance) on the battery terminals 
• The battery fails to start the car, often with a clicking sound 

How to extend battery life

• Have your battery inspected at every service visit. 
• Ensure the battery is securely fastened to prevent vibration damage. 
• Consider replacing your battery every 3 to 4 years as a preventative measure, even if it seems to be working fine.