AutoCodes – Buick – B2665 Buick

B2665 Buick Code - Park Lamp Switch Circuit High

Quick Answer

The headlamp switch provides a ground input into the Body Control Module (BCM) for the park lamp switch input when the switch is activated. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch 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: B2665 Buick indicates Park Lamp Switch Circuit High.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch 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 499

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 B2665 Buick Description

The headlamp switch provides a ground input into the Body Control Module (BCM) for the park lamp switch input when the switch is activated. This input is used by the BCM to control the park lamps. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to battery or open in the park lamp circuit when the Headlamp Switch is in the PARK position.

OBDII Code B2665 Buick - Park Lamp Switch Circuit High - AutoCodes.com — B2665 Buick Code - Park Lamp Switch Circuit High

What does this mean?

What are the Possible Causes of the DTC B2665 Buick?

Faulty Headlamp Switch
Headlamp Switch harness is open or shorted
Headlamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2665 Buick?

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 B2665 Buick 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 B2665 Buick Code

1. What does the OBDII code B2665 mean on a Buick?

B2665 indicates a "Park Lamp Switch Circuit High" issue, meaning there is a problem with the electrical circuit controlling the park lamp switch.

2. What are the symptoms of code B2665 in a Buick?

Common symptoms include non-functioning or flickering parking lights, dashboard warning lights, or issues with nighttime visibility.

3. What causes the B2665 code to appear?

Possible causes include a faulty park lamp switch, damaged wiring, corroded connectors, or a malfunctioning body control module (BCM).

4. Can I drive my Buick with the B2665 code active?

While the car may still be drivable, itâ€™s unsafe to drive at night or in low-visibility conditions without functioning parking lights. Prompt repair is recommended.

5. How do I diagnose the B2665 code on my Buick?

Start by inspecting the park lamp switch, wiring, and connectors for damage or corrosion. Use a multimeter to check the circuit for high voltage or shorts.

6. How do I fix the B2665 code on a Buick?

Repairs may include replacing the park lamp switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the BCM if needed.

7. Could a blown fuse cause the B2665 code?

Yes, a blown fuse in the park lamp circuit can trigger the code. Check the relevant fuse and replace it if necessary.

8. Does the B2665 code always mean the park lamp switch is bad?

No, the issue could also stem from wiring problems, faulty connectors, or BCM issues rather than the park lamp switch itself.

9. How much does it cost to fix the B2665 code on a Buick?

Repair costs vary depending on the issue but may range from $50 for a simple wiring repair to $200â€“$500 if the BCM needs replacement or reprogramming.

10. Can I reset the B2665 code without fixing the problem?

Resetting the code without addressing the issue may clear the warning temporarily, but the code will likely return until the underlying problem is resolved.