B27A4 Toyota 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 Toyota 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.
Code B27A4 Toyota Description
What are the Possible Causes of the DTC B27A4 Toyota?
- 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 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 B27A4 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 B27A4 Toyota code?
Need more information on how to fix the B27A4 Toyota code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B27A4 Toyota code diagnosed by a professional: Find a repair shop in your area
Information for Specific Toyota Models
- B27A4 2013 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
- B27A4 2014 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
- B27A4 2015 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
- B27A4 2016 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
- B27A4 2017 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
- B27A4 2018 Toyota RAV4 — Open in Passengers Side Rear Door Electrical Antenna Circuit
Frequently Asked Questions about B27A4 Toyota Code
What does OBDII code B27A4 mean for a Toyota vehicle?
Code B27A4 indicates an open circuit in the passenger-side rear door's electrical antenna circuit, which is part of the smart key system.
What are the common symptoms of code B27A4 on a Toyota?
Symptoms may include difficulty unlocking or locking the rear passenger door with the smart key, or issues with the proximity sensor not detecting the key near that door.
What causes code B27A4 to appear on a Toyota?
The code is typically caused by damaged wiring, a disconnected or faulty electrical antenna, or corrosion in the connectors of the rear passenger door.
How can I diagnose code B27A4 on a Toyota?
Start by inspecting the wiring harness and connectors for damage or corrosion in the rear passenger door area. Use a multimeter to check for continuity in the antenna circuit.
Can code B27A4 affect other smart key system functions?
Yes, in some cases, it might impact the overall smart key system, causing intermittent issues with locking, unlocking, or starting the vehicle.
Is it safe to drive with code B27A4 on a Toyota?
Yes, it is generally safe to drive, but the smart key system might not function properly for the affected door, which could be inconvenient.
How can code B27A4 be repaired on a Toyota?
Repairs typically involve fixing or replacing damaged wiring, cleaning corroded connectors, or replacing the defective electrical antenna in the rear passenger door.
Can I clear code B27A4 without fixing the issue?
While clearing the code with an OBDII scanner might temporarily remove it, the issue will likely return until the underlying problem is resolved.
How much does it cost to repair code B27A4 on a Toyota?
Repair costs can vary depending on the extent of damage. Simple wiring repairs might cost under $100, while antenna replacement could cost several hundred dollars.
Do I need professional assistance to fix code B27A4?
If you’re comfortable with automotive wiring and diagnostics, you might be able to fix it yourself. Otherwise, it’s recommended to seek professional help to ensure proper repair.
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