Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Subaru BRZ Limited, Automatic TransFACTORY OEM SERVICE PROCEDURE
Entry Start System
ENTRY START SYSTEM DIAGNOSTIC TROUBLE CODE DESCRIPTION
| DTC Code | Detection Item | See |
|---|---|---|
| B27A1 | [Driver side external antenna output stage open] | DTC B27A1: DRIVER SIDE EXTERNAL ANTENNA OUTPUT STAGE OPEN |
| B27A2 | [Passenger side external antenna output stage open] | DTC B27A2 PASSENGER SIDE EXTERNAL ANTENNA OUTPUT STAGE OPEN |
| B27A5 | [Front internal antenna output stage open] | DTC B27A5 FRONT INTERNAL ANTENNA OUTPUT STAGE OPEN |
| B27A6 | [Rear internal antenna output stage open] | DTC B27A6 REAR INTERNAL ANTENNA OUTPUT STAGE OPEN |
| B27A7 | [Trunk/rear gate internal antenna output stage open] | DTC B27A7 TRUNK/REAR GATE INTERNAL ANTENNA OUTPUT STAGE OPEN |
| B27A8 | [Trunk/rear gate external antenna output stage open] | DTC B27A8 TRUNK/REAR GATE EXTERNAL ANTENNA OUTPUT STAGE OPEN |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.