AutoCodes – Toyota – B27A3 Toyota

B27A3 Toyota Code - Open in Drivers Side Rear Door Electrical Antenna Circuit

Quick Answer

The Certification ECU (Smart Key ECU Assembly) generates a request signal and transmits the signal to the Drivers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. Common causes include Faulty Drivers Side Rear Door Outside Handle Assembly, Drivers Side Rear Door Outside Handle Assembly harness is open or shorted, Drivers Side Rear Door Outside Handle Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B27A3 Toyota indicates Open in Drivers Side Rear Door Electrical Antenna Circuit.
Common causes: Common causes include Faulty Drivers Side Rear Door Outside Handle Assembly, Drivers Side Rear Door Outside Handle Assembly harness is open or shorted, Drivers Side Rear Door Outside Handle Assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,049

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B27A3 Toyota Description

The Certification ECU (Smart Key ECU Assembly) generates a request signal and transmits the signal to the Drivers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. For the Drivers Side Rear Door Outside Handle Assembly (electrical key antenna) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, a signal requesting a response from the electrical key transmitter sub-assembly is transmitted within approximately 1 m (3.28 ft.) of the rear door at intervals of 0.25 seconds. The Diagnostic Trouble Code (DTC) B27A3 is stored by the Certification ECU (Smart Key ECU Assembly) when an open circuit is detected between the Certification ECU (Smart Key ECU Assembly) and Drivers Side Rear Door Outside Handle Assembly (electrical key antenna).

OBDII Code B27A3 Toyota - Open in Drivers Side Rear Door Electrical Antenna Circuit - AutoCodes.com — B27A3 Toyota Code - Open in Drivers Side Rear Door Electrical Antenna Circuit

What does this mean?

What are the Possible Causes of the DTC B27A3 Toyota?

Faulty Drivers Side Rear Door Outside Handle Assembly
Drivers Side Rear Door Outside Handle Assembly harness is open or shorted
Drivers Side Rear Door Outside Handle Assembly circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B27A3 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B27A3 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B27A3 Toyota code?

Need more information on how to fix the B27A3 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B27A3 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

B27A3 2013 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 2014 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 2015 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 2016 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 2017 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 2018 Toyota RAV4 — Open in Drivers Side Rear Door Electrical Antenna Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B27A3 Toyota Code

1. What does the OBDII code B27A3 mean on a Toyota?

B27A3 indicates an open circuit in the driverâ€™s side rear door electrical antenna circuit, which is part of the smart key system.

2. What are the common symptoms of the B27A3 code?

Symptoms may include difficulty unlocking or locking the car using the smart key, poor key detection near the rear driverâ€™s side door, or a malfunction warning light on the dashboard.

3. What causes the B27A3 code to appear?

The code is typically caused by a damaged or disconnected antenna wire, a faulty electrical antenna module, or a poor connection in the circuit.

4. Is the B27A3 code a serious issue?

While it doesnâ€™t affect drivability, it can impair the smart key system's functionality, making it inconvenient to lock, unlock, or start the vehicle.

5. How can I diagnose the B27A3 code?

Start by visually inspecting the wiring and connections for damage or loose connections near the driverâ€™s side rear door. Use a multimeter to test for continuity in the antenna circuit.

6. Can the B27A3 code be fixed without replacing parts?

Yes, if the issue is a loose connection or corroded wire, securing the connection or cleaning the corrosion may resolve the problem without part replacement.

7. What parts might need replacing to fix the B27A3 code?

You may need to replace the driverâ€™s side rear door electrical antenna, associated wiring, or connectors if they are damaged.

8. How much does it cost to fix the B27A3 code on a Toyota?

The cost varies depending on the issue. A simple wiring repair may cost $50-$100, while replacing the antenna or related components could cost $200-$400 or more.

9. Can I continue driving with the B27A3 code present?

Yes, the car is still drivable, but the smart key system may not function correctly on the affected side.

10. Do I need professional help to fix the B27A3 code?

If youâ€™re experienced with automotive electrical systems, you can attempt the repair yourself. Otherwise, itâ€™s best to consult a professional technician to ensure accurate diagnosis and repair.