AutoCodes – Dodge – B21F8 Dodge

B21F8 Dodge Code - Exterior Lighting Power Supply Input 1 Circuit Open

Quick Answer

The Body Control Module (BCM) monitors the Exterior Lighting Power Supply Input 1 Circuit. Common causes include Blown Exterior Lighting Fuse, Exterior Lighting Fuse harness is open or shorted, Exterior Lighting Fuse 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: B21F8 Dodge indicates Exterior Lighting Power Supply Input 1 Circuit Open.
Common causes: Common causes include Blown Exterior Lighting Fuse, Exterior Lighting Fuse harness is open or shorted, Exterior Lighting Fuse 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 1,089

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 Sep 30, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B21F8 Dodge Description

The Body Control Module (BCM) monitors the Exterior Lighting Power Supply Input 1 Circuit. The BCM sets the OBDII code when it detects less than 1.0 volt on the Fused B(+) circuit.

OBDII Code B21F8 Dodge - Exterior Lighting Power Supply Input 1 Circuit Open - AutoCodes.com — B21F8 Dodge Code - Exterior Lighting Power Supply Input 1 Circuit Open

What does this mean?

What are the Possible Causes of the DTC B21F8 Dodge?

Blown Exterior Lighting Fuse
Exterior Lighting Fuse harness is open or shorted
Exterior Lighting Fuse circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B21F8 Dodge?

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 B21F8 Dodge 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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Need Help with the 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 B21F8 Dodge Code

1. What are the common symptoms of OBDII code B21F8 in a Dodge related to Exterior Lighting Power Supply Input 1 Circuit Open?

- The common symptoms include exterior lights not functioning properly, dimming or flickering lights, or total loss of power to the exterior lighting.

2. What are the possible causes of the Exterior Lighting Power Supply Input 1 Circuit Open code in a Dodge?

- Possible causes include a faulty wiring harness, a blown fuse, a malfunctioning light control module, or a damaged exterior lighting component.

3. How can I diagnose the issue causing the B21F8 code in my Dodge related to exterior lighting?

- You can use a multimeter to test the voltage at the exterior lighting power supply input, check the wiring harness for any visible damage, and inspect the fuses related to the exterior lighting system.

4. Can I still drive my Dodge with the OBDII code B21F8 related to Exterior Lighting Power Supply Input 1 Circuit Open?

- It is not recommended to drive the vehicle with this code as it can affect the visibility of your vehicle to other drivers, potentially leading to safety hazards.

5. How can I repair the Exterior Lighting Power Supply Input 1 Circuit Open issue in my Dodge?

- Repair methods may include repairing or replacing damaged wiring, replacing blown fuses, repairing or replacing the light control module, or replacing malfunctioning exterior lighting components.

6. Is it safe to reset the OBDII code B21F8 related to Exterior Lighting Power Supply Input 1 Circuit Open without fixing the issue?

- It is not recommended to reset the code without addressing the underlying issue, as the problem will likely persist and could lead to further complications.

7. Will the B21F8 code related to Exterior Lighting Power Supply Input 1 Circuit Open cause my Dodge to fail an emissions test?

- While this code is related to exterior lighting and not emissions, it is still important to address it as it can affect the overall electrical system of the vehicle.

8. Can extreme weather conditions cause the B21F8 code to appear in a Dodge?

- Extreme weather conditions can potentially contribute to wiring or component damage, which may lead to the B21F8 code related to Exterior Lighting Power Supply Input 1 Circuit Open.

9. Are there any preventive measures I can take to avoid the OBDII code B21F8 in my Dodge?

- Regularly inspecting the exterior lighting system, ensuring proper maintenance, and addressing any electrical issues promptly can help prevent the occurrence of the B21F8 code.

10. How long does it typically take to repair the B21F8 code in a Dodge related to Exterior Lighting Power Supply Input 1 Circuit Open?

- The repair time can vary depending on the specific cause of the issue, but it may take anywhere from a few hours to a day for a professional technician to diagnose and fix the problem.