AutoCodes – Honda – B1664 Honda

B1664 Honda Code - Rear Interior LF Antenna Circuit Open

Quick Answer

The remote is equipped with a keyless transmitter, and all doors can be locked and unlocked by a lock/unlock button operation, even from a remote distance from the vehicle. Common causes include Faulty Rear Interior Low Frequency (LF) Antenna, Rear Interior Low Frequency (LF) Antenna harness is open or shorted, Rear Interior Low Frequency (LF) Antenna 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: B1664 Honda indicates Rear Interior LF Antenna Circuit Open.
Common causes: Common causes include Faulty Rear Interior Low Frequency (LF) Antenna, Rear Interior Low Frequency (LF) Antenna harness is open or shorted, Rear Interior Low Frequency (LF) Antenna 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 11,351

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 Jun 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1664 Honda Description

The remote is equipped with a keyless transmitter, and all doors can be locked and unlocked by a lock/unlock button operation, even from a remote distance from the vehicle. When the remote lock button or the remote unlock button is pressed, the keyless transmitter sends the applicable switch signal to the keyless access control unit. After receiving the authentication at the keyless access control unit, then the door lock signals are sent to MICU through B-CAN.
The front interior, the middle interior, and the rear interior Low Frequency (LF) antennas send the signals to the remote of inside the vehicle. The driver's door outer handle, the front passenger's door outer handle, and the rear bumper LF antennas send the signals to the remote of outside the vehicle.

OBDII Code B1664 Honda - Rear Interior LF Antenna Circuit Open - AutoCodes.com — B1664 Honda Code - Rear Interior LF Antenna Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1664 Honda?

Faulty Rear Interior Low Frequency (LF) Antenna
Rear Interior Low Frequency (LF) Antenna harness is open or shorted
Rear Interior Low Frequency (LF) Antenna circuit poor electrical connection
Faulty Keyless Access Control Unit

How to Fix the DTC B1664 Honda?

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 B1664 Honda 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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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 B1664 Honda Code

1. What does the OBDII code B1664 mean on a Honda?

The B1664 code indicates an open circuit in the Rear Interior Left Front (LF) Antenna circuit, which is part of the keyless entry or smart key system.

2. What are the symptoms of code B1664 on a Honda?

Common symptoms include difficulty locking or unlocking the vehicle with the key fob, issues with the push-button start system, or a warning light on the dashboard.

3. What causes the B1664 code to appear?

The code is typically caused by a damaged or disconnected antenna wiring, a faulty rear interior LF antenna, or a malfunction in related components like connectors or the control module.

4. How can I diagnose the B1664 code?

Start by inspecting the antenna wiring and connectors for damage or disconnection, then test the antenna itself for continuity using a multimeter, and check the keyless entry control module for faults.

5. Can I still drive my Honda with a B1664 code?

Yes, you can usually drive the vehicle, but you may experience issues with keyless entry or the push-button start system, which could become inconvenient.

6. How do I fix the B1664 Honda code?

Repairs may involve reconnecting or replacing damaged wiring, replacing the faulty rear interior LF antenna, or addressing issues with the keyless entry control module.

7. How much does it cost to fix a B1664 code?

The cost varies depending on the issue. Replacing an antenna or repairing wiring may cost between $100 and $300, while module replacement or advanced diagnostics could cost more.

8. Can a dead key fob battery cause the B1664 code?

No, a dead key fob battery will not trigger this code, but it could cause similar symptoms. Replace the battery to rule out key fob issues.

9. Is the B1664 code common in Honda vehicles?

This code is not very common but may appear in models with advanced keyless entry or smart key systems when there are wiring or antenna issues.

10. Do I need a professional mechanic to fix the B1664 code?

If youâ€™re comfortable with basic electrical diagnostics, you can inspect and repair wiring or replace the antenna yourself. For complex issues, itâ€™s best to consult a professional.