AutoCodes – Generic – B27A4

B27A4 Code - Open in Passengers 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 Passengers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. Common causes include Faulty Passengers Side Rear Door Outside Handle Assembly, Passengers Side Rear Door Outside Handle Assembly harness is open or shorted, Passengers 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: B27A4 indicates Open in Passengers Side Rear Door Electrical Antenna Circuit.
Common causes: Common causes include Faulty Passengers Side Rear Door Outside Handle Assembly, Passengers Side Rear Door Outside Handle Assembly harness is open or shorted, Passengers 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 3,258

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 B27A4 Description

The Certification ECU (Smart Key ECU Assembly) generates a request signal and transmits the signal to the Passengers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. For the Passengers 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 Passengers Side Rear Door Outside Handle Assembly (electrical key antenna).

OBDII Code B27A4 - Open in Passengers Side Rear Door Electrical Antenna Circuit - AutoCodes.com — B27A4 Code - Open in Passengers Side Rear Door Electrical Antenna Circuit

What does this mean?

What are the Possible Causes of the DTC B27A4?

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

How to Fix the DTC B27A4?

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 B27A4 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 B27A4 code?

Need more information on how to fix the B27A4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B27A4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B27A4 Infiniti — Air Mix Door Motor
B27A4 Lexus — Open in Passengers Side Rear Door Electrical Antenna Circuit
B27A4 Nissan — Air Mix Door Motor
B27A4 Scion — Open in Passengers Side Rear Door Electrical Antenna Circuit
B27A4 Toyota — Open in Passengers 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 B27A4 Code

1. What are common symptoms of OBDII code B27A4?

- Common symptoms include issues with keyless entry system, poor reception of signals, and warning lights on the dashboard.

2. What can cause the OBDII code B27A4 to appear?

- The code B27A4 typically appears due to a break or malfunction in the electrical antenna circuit of the passengers side rear door.

3. How can I diagnose the issue related to the Open in Passengers Side Rear Door Electrical Antenna Circuit?

- You can diagnose the issue by visually inspecting the wiring, checking for loose connections, and using a multimeter to test for continuity.

4. Can I still drive my vehicle with the B27A4 code present?

- It is generally safe to drive the vehicle with this code, but you may experience issues with the keyless entry system and signal reception.

5. How can I repair the Open in Passengers Side Rear Door Electrical Antenna Circuit issue?

- The repair typically involves locating the break in the circuit, repairing or replacing the damaged wiring, and ensuring proper connection.

6. Is it possible to reset the B27A4 code without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is important to address the root cause to prevent the code from reappearing.

7. Are there any DIY tips for troubleshooting the B27A4 code?

- DIY tips include checking for physical damage to the wiring, inspecting connectors for corrosion, and ensuring proper grounding.

8. Can weather conditions affect the appearance of the B27A4 code?

- Extreme weather conditions, such as heavy rain or snow, can exacerbate issues with the electrical antenna circuit and trigger the B27A4 code.

9. How much does it typically cost to repair the Open in Passengers Side Rear Door Electrical Antenna Circuit issue?

- The cost of repair can vary depending on the extent of the damage and whether you choose to do it yourself or take it to a professional mechanic.

10. Will fixing the B27A4 code improve my vehicle's overall performance?

- Fixing the Open in Passengers Side Rear Door Electrical Antenna Circuit issue can restore the proper functioning of keyless entry systems and improve signal reception, enhancing convenience and safety.