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Engine-Codes – Honda – B1668 Honda

B1668 Honda Code - Rear Shelf LF Antenna Circuit Open

Quick Answer

The B1668 code for Honda vehicles indicates a problem with the rear shelf LF antenna circuit being open. Common causes include Wiring damage due to wear and tear, Corrosion in the wiring connections, Loose or disconnected wiring in the rear shelf LF antenna circuit. 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
B1668 Honda indicates Rear Shelf LF Antenna Circuit Open.
Common causes
Common causes include Wiring damage due to wear and tear, Corrosion in the wiring connections, Loose or disconnected wiring in the rear shelf LF antenna circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code B1668 Honda Description

The B1668 code for Honda vehicles indicates a problem with the rear shelf LF antenna circuit being open. This circuit is responsible for receiving signals from the key fob to unlock or lock the vehicle. When this circuit is open, it means that there is a break or disconnection in the wiring, preventing the antenna from properly functioning. This can lead to difficulties in remotely unlocking or locking the vehicle, potentially causing inconvenience for the driver. If not addressed, this issue can also impact the overall security of the vehicle, as it may not respond to the key fob signals as intended. The underlying cause of this problem is often related to wiring issues, such as breaks, loose connections, or corrosion.

OBDII Code B1668 Honda - Rear Shelf LF Antenna Circuit Open
B1668 Honda Code - Rear Shelf LF Antenna Circuit Open

Common Causes of B1668 Honda

  1. Wiring damage due to wear and tear.
  2. Corrosion in the wiring connections.
  3. Loose or disconnected wiring in the rear shelf LF antenna circuit.
  4. Faulty antenna module.
  5. Key fob battery issues.

Symptoms of B1668 Honda

  1. Key fob not working to unlock or lock the vehicle.
  2. Alarm system not responding to key fob signals.
  3. Inconsistent or weak signal reception from the key fob.
  4. Vehicle security system malfunction warning light on the dashboard.
  5. Difficulty starting the vehicle due to the security system not recognizing the key fob.

How to Fix B1668 Honda

  1. Begin by performing a visual inspection of the wiring in the rear shelf LF antenna circuit to look for any breaks, corrosion, or loose connections.
  2. Use a multimeter to test the continuity of the wiring to identify the exact location of the open circuit.
  3. Repair or replace any damaged wiring or connections in the circuit.
  4. Test the antenna module to ensure it is functioning properly; replace if necessary.
  5. Reset the vehicle's security system and reprogram the key fob to sync with the repaired circuit.

Cost to Fix B1668 Honda

The typical cost for repairing a rear shelf LF antenna circuit open issue can range from $100 to $300, depending on the extent of the damage and whether any parts need to be replaced. This estimate includes both parts and labor. It's important to note that actual repair costs can vary based on factors such as location, vehicle make and model, and the specific repair shop. It's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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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 B1668 Honda Code

1. What are the common symptoms of OBDII code B1668 in a Honda related to the Rear Shelf LF Antenna Circuit Open?

When this code is present, you may experience issues with the keyless entry system, such as the remote key fob not working or the inability to start the vehicle with the push-to-start button.

2. What are some possible causes of the Rear Shelf LF Antenna Circuit Open OBDII code in a Honda?

The code B1668 typically indicates an open circuit in the LF (left front) antenna located on the rear shelf of the vehicle. This could be caused by damaged wiring, a faulty antenna module, or a poor connection.

3. How can I diagnose the Rear Shelf LF Antenna Circuit Open issue in my Honda?

To diagnose this issue, you can start by visually inspecting the wiring leading to the LF antenna. Check for any visible damage or loose connections. You may also use a multimeter to test for continuity in the circuit.

4. Are there any DIY repair tips for fixing the B1668 OBDII code in a Honda?

If you're comfortable working with automotive wiring, you may attempt to repair the open circuit in the LF antenna wiring yourself. However, it's recommended to consult a professional technician for a proper diagnosis and repair.

5. Can the B1668 OBDII code be cleared/reset without fixing the underlying issue in a Honda?

While you can clear the B1668 code using an OBDII scanner, it's important to address the root cause of the problem to prevent further issues with the keyless entry system in your Honda.

6. Is it safe to continue driving my Honda with the Rear Shelf LF Antenna Circuit Open OBDII code present?

While the vehicle may still be operational with this issue, it's best to address it promptly to avoid potential inconveniences or complications with the keyless entry system in the future.

7. How much does it typically cost to repair the Rear Shelf LF Antenna Circuit Open problem in a Honda?

The cost of repair can vary depending on the extent of the damage and whether any components need to be replaced. It's advisable to obtain a few quotes from reputable auto repair shops for an accurate estimate.

8. Can extreme weather conditions cause the B1668 OBDII code to trigger in a Honda?

Extreme weather conditions, such as exposure to moisture or extreme heat, can potentially damage the LF antenna wiring and lead to an open circuit fault triggering the B1668 code.

9. Will disconnecting the car battery reset the B1668 OBDII code in a Honda?

Disconnecting the car battery may temporarily clear the code, but it's likely to reappear if the underlying issue with the LF antenna circuit remains unresolved.

10. How long does it usually take to repair the Rear Shelf LF Antenna Circuit Open issue in a Honda?

The repair time can vary depending on the complexity of the wiring repair or component replacement needed. A professional technician can provide a more accurate estimate based on your specific situation.

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