B21F9 Chrysler 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 Chrysler 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 Chrysler Description
What are the Possible Causes of the DTC B21F9 Chrysler?
- 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 Chrysler?
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 Chrysler 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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Frequently Asked Questions about B21F9 Chrysler Code
1. What does the OBDII code B21F9 mean on a Chrysler vehicle?
The code B21F9 indicates an issue with the Exterior Lighting Power Supply Input 2 Circuit, specifically an open circuit preventing proper current flow.
2. What are the common symptoms of the B21F9 code?
Symptoms include non-functional exterior lights, such as headlights, taillights, or turn signals, and possibly a warning light on the dashboard.
3. What causes the B21F9 code to appear?
Common causes include damaged wiring, a blown fuse, a faulty relay, or a malfunctioning lighting control module.
4. How can I diagnose the B21F9 code on my Chrysler?
Start by inspecting the wiring and connectors for damage or corrosion, check the fuses and relays for the exterior lighting circuit, and test the power supply to confirm continuity.
5. Can I drive my Chrysler with the B21F9 code active?
It’s not recommended, as malfunctioning exterior lights can make your vehicle unsafe and may result in legal issues.
6. How do I fix the B21F9 code?
Repairs may include replacing damaged wires, fuses, or relays, or repairing or replacing the lighting control module if it is at fault.
7. How much does it cost to fix the B21F9 code on a Chrysler?
Costs vary depending on the issue, but wiring repairs or fuse replacements are generally inexpensive, while a new lighting control module can be more costly.
8. Can a dead battery cause the B21F9 code?
A dead or weak battery is unlikely to directly cause this code but could contribute to electrical issues if it disrupts the power supply.
9. Will resetting the code fix the B21F9 issue?
Simply clearing the code won’t fix the problem; you must address the underlying issue with the circuit to prevent the code from returning.
10. What tools are needed to troubleshoot the B21F9 code?
Basic tools include a multimeter for checking voltage and continuity, a scan tool for reading codes, and possibly a wiring diagram for the exterior lighting circuit.
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