This bulletin announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4 Denso CP1 Audio and Navigation head units utilized in the models listed.This is an revised version of the original bulletin.
full bulletin at NHTSA ↗2021 Subaru Legacy electrical problems
moderate Owners of the 2021 Subaru Legacy have filed 4 NHTSA complaints about the electrical at roughly $850 to repair (U.S. federal records, as of September 2026). Source: NHTSA Office of Defects Investigation. See electrical across all vehicles →
Complaints
4
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2017 Legacy | 30 |
| 2018 Legacy | 38 |
| 2019 Legacy | 34 |
| 2020 Legacy | 14 |
| 2021 Legacy (this page) | 4 |
| 2024 Legacy | 5 |
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experiencing battery drain when the ignition is off, leading to no-start conditions or frequent jump-starts.This is an revised version of the original bulletin.
full bulletin at NHTSA ↗This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. (This is an revised version of the original bulletin.)
full bulletin at NHTSA ↗This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin
full bulletin at NHTSA ↗This bulletin announces the design change made to the high-pressure fuel pump developed to prevent DTC P0087 (Fuel Rail/System Pressure – Too Low Bank 1). (This is an revised version of the original bulletin.)
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
What owners are reporting 4 most recent
ODS sensor recall still not fixed/remedy available, used heat for first time since i purchased the car, minor cracks in the windshield, car radio/monitors randomly go black, reverse camera won’t work, restarts on there own after a while
Battery died completely, left me stranded at a gas station. I had to call and get a jump. I've had the car 9 weeks, it only has 690 miles on it. No warning lights prior, did notice a slightly longer crank a couple days prior. I was told by the dealer that I don't drive enough, and I should keep my key at least 30 feet away when the keys are in the house, because that can silently drain the…
There seems to be an issue with the infotainment system. The system will randomly turn off which also turns off the safety features. I would like to associate this while CarPlay is in use, but I have witnessed it happen without CarPlay. Subaru has already replaced the head unit under warranty, but the problem continues. For the cost of the car, this should not be an issue.
recall not fixed yet, what happens if a car hits me & the passenger airbags don’t work? unsafe, doesn’t seem like it’s being fixed in a timely manner
Had electrical trouble with your 2021 Subaru Legacy?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2021 Subaru Legacy?
It's a documented issue but not catastrophic. 4 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2021/Subaru/Legacy.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.