OBD-II FAULT CODE
B2550
LAMP DOME OUTPUT Circuit Short to Ground
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2550.
- Body/accessory warning lamp or feature not working
- Blown bulb/LED module
- Poor ground
- Fuse/relay fault
- Switch/module/wiring issue
- Wire shorted to chassis/ground
- Check related fuses, connectors, grounds and switch/module power supply
- Check bulb/module, fuse, ground and connector corrosion
- Inspect harness for rubbing/pinch points and check resistance to ground
- Replace failed bulb/module, repair ground/wiring, replace switch/relay if confirmed
- Repair insulation/harness damage or replace internally shorted component
Related Codes
Need more help?
Search manuals, wiring diagrams and technical service bulletins.
Not sure what to do next?
Get step-by-step instructions and professional repair information.
Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.