B21F8 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 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.
Code B21F8 Description
What are the Possible Causes of the DTC B21F8?
- 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?
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 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 B21F8 code?
Need more information on how to fix the B21F8 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B21F8 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B21F8 Chrysler — Exterior Lighting Power Supply Input 1 Circuit Open
- B21F8 Dodge — Exterior Lighting Power Supply Input 1 Circuit Open
- B21F8 Jeep — Exterior Lighting Power Supply Input 1 Circuit Open
- B21F8 RAM — Exterior Lighting Power Supply Input 1 Circuit Open
Frequently Asked Questions about B21F8 Code
1. What are common symptoms of OBDII code B21F8 (Exterior Lighting Power Supply Input 1 Circuit Open)?
- Common symptoms include exterior lights not working, flickering lights, or dim lights on the vehicle.
2. What are possible causes of OBDII code B21F8?
- Possible causes include a damaged wiring harness, a blown fuse, a faulty relay, or a malfunctioning light switch.
3. How can I diagnose the issue related to OBDII code B21F8?
- You can start by inspecting the wiring for any visible damage, checking the fuses and relays related to the exterior lighting system, and testing the light switch for proper functionality.
4. Can a DIY enthusiast repair OBDII code B21F8 at home?
- Depending on the cause of the issue, DIY repairs may be possible for those with automotive repair experience. However, complex electrical issues may require professional assistance.
5. Is it safe to continue driving with OBDII code B21F8 present?
- It is not recommended to drive with OBDII code B21F8, as malfunctioning exterior lights can compromise your safety on the road, especially in low visibility conditions.
6. How much does it typically cost to repair OBDII code B21F8?
- The cost of repair can vary depending on the underlying cause and whether you choose to DIY or seek professional help. Costs may range from a simple fuse replacement to more extensive wiring repairs.
7. Are there any preventive measures to avoid OBDII code B21F8 in the future?
- Regularly inspecting the exterior lighting system, keeping the wiring well-maintained, and promptly addressing any lighting issues can help prevent OBDII code B21F8 from occurring.
8. Can weather conditions affect the likelihood of OBDII code B21F8 being triggered?
- Extreme weather conditions, such as heavy rain or snow, can potentially damage the exterior lighting system and increase the risk of triggering OBDII code B21F8.
9. Will resetting the OBDII system clear OBDII code B21F8?
- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.
10. How important is it to address OBDII code B21F8 promptly?
- It is crucial to address OBDII code B21F8 promptly to ensure the proper functioning of your vehicle's exterior lighting system and maintain road safety for yourself and other drivers.
Discuss the causes and fixes for B21F8 OBDII Code
Code B21F8 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
