AutoCodes – Generic – B27A6

B27A6 Code - Open In Rear Floor Electrical Key Oscillator Circuit

Quick Answer

The Certification ECU (Smart Key ECU Assembly) generates a request signal and sends it to the Indoor Electrical Key Oscillator (for center floor). Common causes include Faulty Indoor Electrical Key Oscillator (for center floor), Indoor Electrical Key Oscillator harness is open or shorted, Indoor 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: B27A6 indicates Open In Rear Floor Electrical Key Oscillator Circuit.
Common causes: Common causes include Faulty Indoor Electrical Key Oscillator (for center floor), Indoor Electrical Key Oscillator harness is open or shorted, Indoor 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 3,727

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 B27A6 Description

The Certification ECU (Smart Key ECU Assembly) generates a request signal and sends it to the Indoor Electrical Key Oscillator (for center floor). To detect the key inside the cabin, the Indoor Electrical Key Oscillator (for center floor) creates a detection area in the cabin.
The Diagnostic Trouble Code (DTC) B27A6 is detected by the Certification ECU (Smart Key ECU Assembly) when an open circuit occurs between the Certification ECU (Smart Key ECU Assembly) and Indoor Electrical Key Oscillator (for center floor) terminals.

OBDII Code B27A6 - Open In Rear Floor Electrical Key Oscillator Circuit - AutoCodes.com — B27A6 Code - Open In Rear Floor Electrical Key Oscillator Circuit

What does this mean?

What are the Possible Causes of the DTC B27A6?

Faulty Indoor Electrical Key Oscillator (for center floor)
Indoor Electrical Key Oscillator harness is open or shorted
Indoor Electrical Key Oscillator circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B27A6?

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 B27A6 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 Makes

B27A6 Infiniti — Mode Door Motor
B27A6 Lexus — Open In Rear Floor Electrical Key Oscillator Circuit
B27A6 Nissan — Mode Door Motor
B27A6 Scion — Open In Rear Floor Electrical Key Oscillator Circuit
B27A6 Toyota — Open In Rear Floor Electrical Key Oscillator 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 B27A6 Code

What does OBDII code B27A6 mean?

Code B27A6 indicates an open circuit in the rear floor electrical key oscillator, which is part of the vehicle's keyless entry and start system.

What are the common symptoms of code B27A6?

Common symptoms include the key fob not being detected in the vehicle, difficulty starting the car, or keyless entry features not functioning properly.

What causes the B27A6 code to appear?

The code can be caused by a damaged or disconnected rear floor electrical key oscillator, faulty wiring or connectors, or a failed oscillator module.

How do I diagnose the B27A6 code?

Diagnosis involves checking the rear floor oscillator for damage, inspecting the wiring and connectors for continuity, and testing the oscillator module for proper function.

Can a dead key fob battery cause code B27A6?

No, a dead key fob battery typically causes different issues. Code B27A6 is related to the electrical circuit of the rear floor oscillator, not the key fob itself.

Is it safe to drive with the B27A6 code?

While the vehicle may still be drivable, the keyless entry and start system may malfunction, potentially leaving you unable to start the car in some situations.

How do I fix code B27A6?

Repairs may include replacing the rear floor electrical key oscillator, repairing damaged wiring or connectors, or reprogramming the system if necessary.

Can I clear the B27A6 code without repairs?

Clearing the code without addressing the underlying issue may cause it to reappear. Proper diagnosis and repair are recommended.

How much does it cost to fix code B27A6?

Repair costs vary depending on whether you need to replace the oscillator, repair wiring, or address other related issues. Expect costs to range from $100 to $400 or more.

Can a software update fix the B27A6 code?

In some cases, a software update may resolve communication issues in the system, but physical damage to the oscillator or wiring will require repairs.