OBD-II FAULT CODE
B2511
Horn Output Relay Circuit Short to Battery
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2511.
- Body/accessory warning lamp or feature not working
- Weak battery
- Charging system fault
- Loose/corroded terminals
- Poor ground
- Wire shorted to power feed
- Check related fuses, connectors, grounds and switch/module power supply
- Test battery state of charge and charging voltage
- Inspect terminals and ground straps
- Check for unwanted voltage on signal/control circuit
- Clean/tighten terminals, replace weak battery, repair alternator/charging circuit as needed
- Repair harness short to power 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.