by Lawsuit Against Subaru Over Widespread Battery Drain Issue
Modern cars consume more electricity at rest than before, but some Subaru owners claim their vehicles never stop consuming it. Many automakers face complaints about a single problematic model. However, it is rarer to see the same defect attributed to almost an entire model lineup. A new class-action lawsuit claims that many well-known brand models suffer from a persistent battery drain problem.
Lawsuit Details and Affected Models
The complaint was filed on May 1st in the U.S. District Court for the District of New Jersey. The defendants are Subaru of America and Subaru Corporation. The plaintiffs allege that the vehicles’ electrical systems continue to draw power after the ignition is turned off, eventually leading to complete battery discharge.
The list of models included in the lawsuit comprises:
Complaints About Battery Drain
According to the lawsuit, owners have encountered various problems: from being unable to start the engine to the car stalling while driving. One plaintiff claims their 2024 Subaru Outback completely shut down while driving, blocking traffic, and required a tow. Others note that dealers often replaced batteries, but the problems returned after a few months.
Cause of the Problem and Internal Investigations
The lawsuit does not claim that Subaru installed weak batteries. Instead, the plaintiffs believe the real problem lies in the car’s electronics, which fail to enter the correct low-power sleep mode after shutdown. This allegedly creates a constant “dark current draw” that slowly drains the battery even when parked.
The documentation also mentions several Subaru technical bulletins addressing parasitic drain diagnostics. One bulletin from October 2025 allegedly warned technicians not to automatically blame the data communication module, stating that new-generation modules did not show “persistent parasitic draw issues.”
This detail could be significant as it indicates Subaru was actively investigating the problem internally, while owners continued to report dead batteries and the need for jump starts.
Modern Cars and Energy Consumption
It is no secret that modern cars consume more energy than ever before. This is due to the large number of additional features built into the design. Many of these features, such as connected services, can operate in an almost constant on-state. However, this does not mean that drained batteries are acceptable. We are currently awaiting Subaru’s response to this case to see how events will unfold.
This class-action lawsuit could pose a serious challenge for Subaru, as it covers not one, but several popular models produced over several years. If the court finds the plaintiffs’ arguments valid, the company will have to not only compensate owners for damages but also find a technical solution to eliminate the “dark current” problem. It is worth noting that similar electronic issues are becoming more common in the automotive industry due to the increasing number of electronic systems that operate even when the car is off. This underscores the need for manufacturers to more thoroughly test their vehicles’ energy consumption in standby mode to avoid such widespread complaints in the future.
