Subaru Legacy Brake Light Switch Guide for 2016-2022 Models
Understanding the common brake light switch issues in your 2016-2022 Subaru Legacy and how to fix them.
- A faulty brake light switch can cause a no-start condition, a shifter stuck in Park, and multiple dashboard warning lights.
- Subaru issued a TSB and a recall on other models for this issue, caused by contamination of the switch's internal contacts.
- Replacement is a simple DIY task that takes less than 30 minutes for most owners.
- Before purchasing a part, check with a Subaru dealer for any open recalls on your specific VIN.
Is Your Subaru Legacy Experiencing Electrical Issues? It Could Be the Brake Light Switch.
If your 2016-2022 Subaru Legacy suddenly won't start, gets stuck in Park, or has multiple warning lights on the dashboard, a faulty brake light switch is a likely culprit. This small, inexpensive part can cause a surprising number of problems when it fails. This guide will walk you through the symptoms, known issues, and replacement options for your Legacy.
Known Issue: Brake Light Switch Recall & TSB
Subaru issued a major recall (NHTSA Campaign #19V149000, Subaru #WUE-90) for a faulty brake light switch on many models, though the 2016-2022 Legacy was not explicitly listed in the main recall group which focused on other models like the Crosstrek and Forester. However, Subaru also released a Technical Service Bulletin (TSB) in November 2016 about this exact issue. The original switches were prone to contamination from common interior cleaning products containing silicone. This contamination would build up on the internal contacts, preventing the switch from sending a proper signal. The updated OEM replacement part is a different color (blue instead of gray) and uses a special fluorine grease to prevent this problem. Before buying a new part, it's wise to check with a Subaru dealer using your VIN to see if any open recalls or service campaigns apply to your specific car.
Symptoms of a Failing Brake Light Switch
A bad brake light switch can manifest in several ways. Here are the most common signs:
- Brake lights don't work or stay on: The most obvious symptom is your brake lights not illuminating when you press the pedal, or staying on even when you release it.
- Car won't start: For models with a push-button start, the system needs to see a signal from the brake switch before it will allow the engine to turn on.
- Stuck in Park: The shift interlock safety feature prevents you from shifting out of Park unless the brake pedal is depressed. A bad switch means the car doesn't know you're pressing the brake.
- Multiple dashboard warning lights: A faulty switch can trigger warning lights for the ABS, Vehicle Dynamics Control (VDC), and Check Engine Light.
- Cruise control won't work: The cruise control system deactivates when the brake is pressed. If the switch is faulty, the cruise control may not engage or may turn off unexpectedly.
Choosing the Right Aftermarket Part
When replacing the brake light switch, you have a choice between a new OEM part from a Subaru dealer or a new aftermarket part. For this specific component, the OEM part was known to be faulty from the factory. The aftermarket has had years to address this known issue.
- OEM (Original Equipment Manufacturer): The newest version of the OEM switch (Part No. 83311FJ001) was redesigned to fix the contamination issue. It's a reliable choice, but often more expensive.
- Premium Aftermarket (e.g., Standard Ignition): Brands like Standard Ignition are well-regarded manufacturers that supply parts to professional technicians. They design their parts to meet or exceed OEM specifications and often incorporate improvements over the original design. An aftermarket switch from a quality brand is a dependable and cost-effective alternative to OEM.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $40 - $55 |
| New Aftermarket (Standard Ignition) | $86.33 |
| Shop Labor | $70 - $140 |
Pro Tip: Check the Adjustment
Sometimes, the issue isn't a failed switch but an improperly adjusted one. The switch is threaded and can be rotated to adjust how much pedal travel is needed to activate it. The correct specification is 5.5mm +/- 2.5mm of pedal travel before the lights come on. If you install a new switch, make sure it is adjusted correctly for proper function.
Frequently Asked Questions
Can I replace the brake light switch myself?
Yes, this is a very feasible DIY job for most people. The switch is located above the brake pedal and is typically held in place by a locknut. You just need to disconnect the electrical connector, unthread the old switch, and install the new one. The most difficult part is working in the tight space of the driver's footwell. The entire process usually takes less than 30 minutes.
Why are so many warning lights on because of one small switch?
Modern cars use a shared network (CAN bus) for communication between different computer modules. The brake light switch provides a critical input for many systems. When that signal is lost or incorrect, systems like ABS, VDC, and push-button start go into a fault mode and illuminate their warning lights as a precaution.
My car is a 2017 model. Was it affected by the recall?
While the main recall (WUE-90) primarily listed models up to 2016 or 2017 for other vehicle lines, the underlying switch problem and TSB are relevant for the entire 2016-2022 generation. The best way to be sure is to contact a Subaru dealer with your Vehicle Identification Number (VIN).
Will an aftermarket switch void my warranty?
No. In the United States, the Magnuson-Moss Warranty Act prevents manufacturers from voiding a warranty simply because you used an aftermarket part. The manufacturer would have to prove that the aftermarket part caused the failure of another component.
Helpful Videos
Technical Specifications
OEM Part Numbers: 83311FJ001 83311FG011 83311FG010
4-Terminal Blade Connector, Plunger-style switch
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Legacy:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Subaru Legacy Experiencing Electrical Issues? It Could Be the Brake Light Switch.
- Known Issue: Brake Light Switch Recall & TSB
- Symptoms of a Failing Brake Light Switch
- Choosing the Right Aftermarket Part
- Pro Tip: Check the Adjustment
- Frequently Asked Questions
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