B21F9 Code - Exterior Lighting Power Supply Input 2 Circuit Open
Quick Answer
The Body Control Module (BCM) monitors the Exterior Lighting Power Supply Input 2 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
- B21F9 indicates Exterior Lighting Power Supply Input 2 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.
Code B21F9 Description
What are the Possible Causes of the DTC B21F9?
- 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 B21F9?
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 B21F9 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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Information for Specific Makes
- B21F9 Chrysler — Exterior Lighting Power Supply Input 2 Circuit Open
- B21F9 Dodge — Exterior Lighting Power Supply Input 2 Circuit Open
- B21F9 Jeep — Exterior Lighting Power Supply Input 2 Circuit Open
- B21F9 RAM — Exterior Lighting Power Supply Input 2 Circuit Open
Frequently Asked Questions about B21F9 Code
1. What are the common symptoms of OBDII code B21F9 (Exterior Lighting Power Supply Input 2 Circuit Open)?
- The common symptoms include non-functional exterior lighting, such as headlights, tail lights, or turn signals.
2. What are the possible causes of OBDII code B21F9?
- The code B21F9 can be caused by a damaged wiring harness, a blown fuse, a faulty lighting control module, or a malfunctioning light switch.
3. How can I diagnose the Exterior Lighting Power Supply Input 2 Circuit Open issue?
- To diagnose this issue, you can use a diagnostic scanner to read the trouble code, visually inspect the wiring harness for any damage, check the fuses related to the exterior lighting, and test the lighting control module and light switch for proper functionality.
4. Can a loose connection cause OBDII code B21F9?
- Yes, a loose or corroded connection in the exterior lighting circuit can lead to an open circuit condition and trigger the B21F9 trouble code.
5. What is the recommended repair for OBDII code B21F9?
- The recommended repair for code B21F9 is to repair any damaged wiring, replace blown fuses, repair or replace the lighting control module, and ensure all connections are secure and free of corrosion.
6. Can I drive my vehicle with OBDII code B21F9?
- It is not recommended to drive your vehicle with the B21F9 code present, as non-functional exterior lighting can pose a safety hazard, especially in low visibility conditions.
7. How much does it typically cost to repair OBDII code B21F9?
- The cost of repairing code B21F9 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
8. Will resetting the trouble code make the issue go away permanently?
- Resetting the trouble code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, the code is likely to return.
9. Is the Exterior Lighting Power Supply Input 2 Circuit Open issue a common problem in vehicles?
- Yes, issues with exterior lighting circuits leading to open circuit conditions are relatively common in vehicles and can occur due to various factors like wear and tear, water damage, or electrical faults.
10. Can a DIY enthusiast repair OBDII code B21F9 at home?
- While some DIY enthusiasts may be able to diagnose and repair simple wiring issues related to code B21F9, complex electrical repairs involving modules or switches may require professional assistance to ensure proper repair and safety.
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