AutoCodes – Generic – B2664

B2664 Code - Headlamp Relay Output Open Circuit or Short to Battery

Quick Answer

The Vehicle Security Module monitors the Headlamp Relay. Common causes include Faulty Headlamp Relay, Headlamp Relay harness is open or shorted, Headlamp Relay 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: B2664 indicates Headlamp Relay Output Open Circuit or Short to Battery.
Common causes: Common causes include Faulty Headlamp Relay, Headlamp Relay harness is open or shorted, Headlamp Relay 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 3,677

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 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2664 Description

The Vehicle Security Module monitors the Headlamp Relay. The Vehicle Security Module sets the OBDII code when the Headlamp Relay is not to factory specifications.

OBDII Code B2664 - Headlamp Relay Output Open Circuit or Short to Battery - AutoCodes.com — B2664 Code - Headlamp Relay Output Open Circuit or Short to Battery

What does this mean?

What are the Possible Causes of the DTC B2664?

Faulty Headlamp Relay
Headlamp Relay harness is open or shorted
Headlamp Relay circuit poor electrical connection
Faulty Vehicle Security Module

How to Fix the DTC B2664?

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 B2664 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 B2664 code?

Need more information on how to fix the B2664 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2664 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2664 Ford — Headlamp Relay Output Open Circuit or Short to Battery
B2664 Lincoln — Headlamp Relay Output Open Circuit or Short to Battery
B2664 Mercury — Headlamp Relay Output Open Circuit or Short to Battery

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 B2664 Code

1. What are common symptoms of OBDII code B2664?

- Common symptoms include headlamps not working, headlamp relay not activating, or headlamps flickering intermittently.

2. What can cause the OBDII code B2664 to trigger?

- The code B2664 is triggered when the body control module detects an open circuit or a short to battery in the headlamp relay output circuit.

3. How can I diagnose the cause of OBDII code B2664?

- Diagnose the code by checking the headlamp relay, inspecting the wiring harness for damage, and testing the relay control circuit for continuity.

4. Can a faulty headlamp relay cause the OBDII code B2664?

- Yes, a faulty headlamp relay can cause the code B2664 if it fails to activate or if there is an internal short circuit.

5. What is the typical repair for OBDII code B2664?

- The typical repair involves repairing or replacing the damaged wiring harness, repairing the headlamp relay circuit, or replacing the faulty headlamp relay.

6. Are there any safety concerns associated with OBDII code B2664?

- Yes, driving with non-functional headlamps can pose a safety risk, especially in low light conditions or at night. It is recommended to address the issue promptly.

7. Can I reset the OBDII code B2664 without fixing the underlying issue?

- Resetting the code without addressing the root cause may temporarily clear the code, but it will likely return until the issue is resolved.

8. Will a low battery voltage cause OBDII code B2664 to trigger?

- Low battery voltage can potentially cause the code to trigger, as it may affect the operation of the headlamp relay circuit. Ensure the battery is in good condition.

9. Is it possible to prevent OBDII code B2664 from occurring in the future?

- Regularly inspecting and maintaining the headlamp relay circuit, checking for any signs of damage, and addressing issues promptly can help prevent the code from reoccurring.

10. Can a mechanic easily fix OBDII code B2664, or should I attempt the repair myself?

- Depending on your level of automotive knowledge and experience, you may be able to address the issue yourself by following repair guides. However, a mechanic with diagnostic tools can efficiently diagnose and repair the problem.