AutoCodes – Generic – B2566

B2566 Code - Right Tail Lamp Circuit Short to Ground

Quick Answer

The Body Control Module (BCM) monitors the Right Tail Lamp Circuit. Common causes include Faulty Right Tail Lamp, Right Tail Lamp harness is open or shorted, Right Tail Lamp 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: B2566 indicates Right Tail Lamp Circuit Short to Ground.
Common causes: Common causes include Faulty Right Tail Lamp, Right Tail Lamp harness is open or shorted, Right Tail Lamp 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 3,826

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 Dec 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2566 Description

The Body Control Module (BCM) monitors the Right Tail Lamp Circuit. The BCM sets the OBDII code when the Right Tail Lamp Circuit is not to factory specifications.

OBDII Code B2566 - Right Tail Lamp Circuit Short to Ground - AutoCodes.com — B2566 Code - Right Tail Lamp Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B2566?

Faulty Right Tail Lamp
Right Tail Lamp harness is open or shorted
Right Tail Lamp circuit poor electrical connection

How to Fix the DTC B2566?

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 B2566 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 B2566 code?

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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 B2566 Code

1. What does the OBDII code B2566 mean?

Code B2566 indicates a short to ground in the right tail lamp circuit, meaning there is an electrical issue causing the circuit to lose proper functionality.

2. What are the symptoms of code B2566?

Common symptoms include the right tail lamp not functioning, dim or flickering illumination, or blown fuses related to the tail lamp circuit.

3. What causes code B2566 to trigger?

This code is typically caused by damaged wiring, a corroded or loose connector, a faulty bulb socket, or an internal short in the tail lamp assembly.

4. Can I drive with code B2566 active?

While it may be possible to drive, it is unsafe as the right tail lamp may not work, reducing visibility and increasing the risk of an accident, especially at night.

5. How can I diagnose the cause of code B2566?

Start by visually inspecting the wiring, connectors, and the tail lamp assembly for damage, corrosion, or signs of a short circuit. Use a multimeter to test for continuity and ground faults.

6. What tools are needed to fix code B2566?

A multimeter, wiring diagram, electrical tape, replacement bulbs, or connectors may be needed to diagnose and repair the issue.

7. Can a blown fuse cause code B2566?

Yes, a blown fuse can occur if the short to ground in the circuit overloads the electrical system.

8. How do I repair the issue causing code B2566?

Repair may involve replacing damaged wiring, fixing or replacing corroded connectors, repairing the bulb socket, or replacing the tail lamp assembly if it has an internal short.

9. Will disconnecting the battery clear code B2566?

Disconnecting the battery may temporarily clear the code, but it will return if the underlying issue is not resolved.

10. How much does it cost to repair code B2566?

Repair costs can vary widely depending on the cause, ranging from a few dollars for a replacement bulb to several hundred dollars if the tail lamp assembly or extensive wiring repairs are needed.