Exterior Lighting Power Supply Input 1 Circuit Open
Table of contents
B21F8 RAM Possible Causes
- 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 do I fix code B21F8 RAM?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B21F8 RAM code
The cost of diagnosing the B21F8 RAM code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B21F8 RAM 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.