AutoCodes – Generic – B27A3

B27A3 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 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 3,117

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

What does this mean?

What are the Possible Causes of the DTC B27A3?

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?

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 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

B27A3 Infiniti — Air Mix Door Motor
B27A3 Lexus — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 Nissan — Air Mix Door Motor
B27A3 Scion — Open in Drivers Side Rear Door Electrical Antenna Circuit
B27A3 Toyota — 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 Code

1. What are the common symptoms of OBDII code B27A3 (Open in Drivers Side Rear Door Electrical Antenna Circuit)?

The common symptoms include issues with keyless entry, difficulty locking or unlocking the rear door, and intermittent or complete loss of signal.

2. What can cause the OBDII code B27A3 to trigger?

The code B27A3 is typically triggered by a break or open circuit in the electrical antenna circuit of the driver's side rear door.

3. How can I diagnose the issue related to the OBDII code B27A3?

Diagnosing the problem involves inspecting the wiring harness, connectors, and antenna in the driver's side rear door for any visible damage or breaks. Using a multimeter to test for continuity can also help pinpoint the issue.

4. What are some repair tips for fixing the Open in Drivers Side Rear Door Electrical Antenna Circuit?

Repairing the issue may involve repairing or replacing damaged wiring, connectors, or the antenna itself. Ensuring proper insulation and secure connections is crucial to prevent future problems.

5. Can the OBDII code B27A3 be cleared/reset without fixing the underlying issue?

Clearing the code without fixing the root cause will likely result in it reappearing once the system detects the problem again. It is recommended to address the issue to prevent further complications.

6. Is it safe to continue driving with the OBDII code B27A3 present?

While it may be possible to drive with the code present, it is not recommended as it may lead to further electrical issues or malfunctions in the vehicle's keyless entry system.

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

The cost of repair can vary depending on the extent of the damage, parts needed, and labor rates. It is advisable to consult a professional mechanic for an accurate estimate.

8. Can I fix the OBDII code B27A3 myself, or do I need a professional mechanic?

Depending on your experience and knowledge of automotive electrical systems, you may be able to fix the issue yourself. However, seeking assistance from a qualified mechanic is recommended for complex electrical problems.

9. Are there any preventive measures to avoid encountering the OBDII code B27A3 in the future?

Regularly inspecting the wiring harness and connectors in all doors, especially the rear doors, can help prevent issues like an open circuit in the electrical antenna circuit. Keeping the connections clean and secure is key.

10. Will fixing the Open in Drivers Side Rear Door Electrical Antenna Circuit issue improve the overall functionality of my vehicle?

Yes, resolving the issue related to the OBDII code B27A3 will restore proper functioning of the keyless entry system in the driver's side rear door, ensuring smooth operation and convenience for the driver.