AutoCodes – Toyota – B27A8 Toyota

B27A8 Toyota Code - Open In Outside Luggage Compartment Electrical Key Antenna Circuit

Quick Answer

The Certification ECU (Smart Key ECU Assembly) generates a request signal and sends it to the Outside Electrical Key Oscillator (for rear side). Common causes include Faulty Outside Electrical Key Oscillator (for rear side), Outside Electrical Key Oscillator harness is open or shorted, Outside Electrical Key Oscillator 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: B27A8 Toyota indicates Open In Outside Luggage Compartment Electrical Key Antenna Circuit.
Common causes: Common causes include Faulty Outside Electrical Key Oscillator (for rear side), Outside Electrical Key Oscillator harness is open or shorted, Outside Electrical Key Oscillator 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 13,334

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 B27A8 Toyota Description

The Certification ECU (Smart Key ECU Assembly) generates a request signal and sends it to the Outside Electrical Key Oscillator (for rear side). To detect the key near the driver door, the Outside Electrical Key Oscillator (for rear side) creates a detection area towards the area approximately 1.0 m (3.28 ft.) from the back door.
The Diagnostic Trouble Code (DTC) B27A8 is detected by the Certification ECU (Smart Key ECU Assembly) when an open circuit occurs between the Certification ECU (Smart Key ECU Assembly) and Outside Electrical Key Oscillator (for rear side) terminals.

OBDII Code B27A8 Toyota - Open In Outside Luggage Compartment Electrical Key Antenna Circuit - AutoCodes.com — B27A8 Toyota Code - Open In Outside Luggage Compartment Electrical Key Antenna Circuit

What does this mean?

What are the Possible Causes of the DTC B27A8 Toyota?

Faulty Outside Electrical Key Oscillator (for rear side)
Outside Electrical Key Oscillator harness is open or shorted
Outside Electrical Key Oscillator circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B27A8 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 B27A8 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.

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Information for Specific Toyota Models

B27A8 2013 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key Antenna Circuit
B27A8 2014 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key Antenna Circuit
B27A8 2015 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key Antenna Circuit
B27A8 2016 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key Antenna Circuit
B27A8 2017 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key Antenna Circuit
B27A8 2018 Toyota RAV4 — Open In Outside Luggage Compartment Electrical Key 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 B27A8 Toyota Code

1. What are common symptoms of OBDII code B27A8 in a Toyota related to the Open In Outside Luggage Compartment Electrical Key Antenna Circuit?

The common symptoms include issues with the keyless entry system, difficulty locking or unlocking the vehicle, and the key fob not working properly.

2. What are the possible causes of OBDII code B27A8 in a Toyota?

The code B27A8 indicates an open circuit in the outside luggage compartment electrical key antenna circuit. Possible causes include damaged wiring, a faulty antenna, or a malfunctioning key fob.

3. How can I diagnose the Open In Outside Luggage Compartment Electrical Key Antenna Circuit issue in my Toyota?

Diagnosing the issue involves checking the wiring and connectors in the key antenna circuit for any damage or loose connections. Using a multimeter to test the continuity of the circuit can help pinpoint the location of the open circuit.

4. Is it safe to continue driving my Toyota with the OBDII code B27A8 present?

While the vehicle may still be operable with this code, it is not recommended to ignore it. Addressing the issue promptly can prevent further complications with the keyless entry system and ensure the vehicle's security.

5. Can I repair the Open In Outside Luggage Compartment Electrical Key Antenna Circuit issue in my Toyota myself?

If you have experience with automotive electrical systems and access to the necessary tools, you may be able to repair the issue yourself. However, if you are unsure or unfamiliar with electrical work, it is advisable to seek professional help.

6. How much does it typically cost to repair the Open In Outside Luggage Compartment Electrical Key Antenna Circuit issue in a Toyota?

The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced. It is recommended to obtain quotes from different mechanics or dealerships for an accurate estimate.

7. Can a damaged key fob cause the OBDII code B27A8 to appear in a Toyota?

Yes, a malfunctioning or damaged key fob can contribute to the code B27A8 being triggered. It is important to inspect the key fob along with the circuitry to determine the root cause of the issue.

8. Will resetting the vehicle's computer clear the OBDII code B27A8 related to the Open In Outside Luggage Compartment Electrical Key Antenna Circuit?

Resetting the computer may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the circuit problem to prevent ongoing issues.

9. Are there any preventive measures I can take to avoid encountering OBDII code B27A8 in my Toyota?

Regularly inspecting the key antenna circuit for any signs of wear or damage, avoiding physical trauma to the key fob, and keeping electrical components clean can help prevent the occurrence of this code.

10. How long does it typically take to repair the Open In Outside Luggage Compartment Electrical Key Antenna Circuit issue in a Toyota?

The repair time can vary depending on the complexity of the circuit, the availability of parts, and the proficiency of the technician performing the repair. In general, the repair can take anywhere from a few hours to a full day.