AutoCodes – Acura – B1648 Acura

B1648 Acura Code - Passenger Door 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 Passenger Door Low Frequency (LF) Antenna, Passenger Door Low Frequency (LF) Antenna harness is open or shorted, Passenger Door 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: B1648 Acura indicates Passenger Door LF Antenna Circuit Open.
Common causes: Common causes include Faulty Passenger Door Low Frequency (LF) Antenna, Passenger Door Low Frequency (LF) Antenna harness is open or shorted, Passenger Door 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,533

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 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1648 Acura 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 B1648 Acura - Passenger Door LF Antenna Circuit Open - AutoCodes.com — B1648 Acura Code - Passenger Door LF Antenna Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1648 Acura?

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

How to Fix the DTC B1648 Acura?

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 B1648 Acura 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 B1648 Acura code?

Need more information on how to fix the B1648 Acura code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1648 Acura code diagnosed by a professional: Find a repair shop in your area

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 B1648 Acura Code

1. What does the OBDII code B1648 mean for an Acura?

Code B1648 indicates an issue with the passenger door LF (Left Front) antenna circuit, specifically an open circuit or a break in the connection.

2. What are the symptoms of code B1648 in an Acura?

Common symptoms include difficulty or failure to unlock the passenger door using the keyless entry system, intermittent key fob operation, or remote start not functioning properly on the passenger side.

3. What causes the B1648 Acura code?

The code is typically caused by a damaged LF antenna, broken or corroded wiring, poor electrical connections, or a malfunctioning keyless entry control module.

4. Can I drive my Acura with the B1648 code?

Yes, you can still drive the vehicle, but keyless entry features for the passenger door may not work correctly, which can be inconvenient.

5. How do I diagnose the B1648 code on an Acura?

Start by checking the LF antenna and its wiring for visible damage or corrosion. Use a multimeter to test for continuity and inspect the connectors for proper contact.

6. How do I fix the B1648 code on an Acura?

Repairs may include replacing the LF antenna, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming or replacing the keyless entry control module.

7. How much does it cost to fix the B1648 Acura code?

Repair costs can vary, but replacing an LF antenna typically costs $100-$200, while wiring repairs may cost less depending on the extent of the damage.

8. Can a weak key fob battery trigger the B1648 code?

No, a weak key fob battery does not directly cause the B1648 code, but it can lead to similar issues with keyless entry functionality. Always rule out the battery first.

9. Is the B1648 code specific to Acura vehicles?

While the code B1648 is used across various manufacturers, its specific meaning related to the passenger door LF antenna circuit is tailored to Acura models.

10. Do I need special tools to fix the B1648 code on an Acura?

Basic tools like a multimeter and OBDII scanner are sufficient for diagnosing the issue. Advanced repairs may require specialized tools for wiring or control module replacement.