OBD-II FAULT CODE
B2451
Aux Heater Fuel Pump Circuit Short to Ground
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2451.
- Body/accessory warning lamp or feature not working
- Hard start, hesitation, stalling or inaccurate fuel reading depending on component
- Low fuel pressure
- Faulty pump/regulator/sensor
- Wiring fault
- Clogged filter
- Injector fault
- Check related fuses, connectors, grounds and switch/module power supply
- Check fuel pressure and sensor data
- Inspect pump/injector fuses, relay, wiring and grounds
- Inspect harness for rubbing/pinch points and check resistance to ground
- Repair wiring/relay issues, replace clogged filter, failed pump/sensor/injector only after testing
- Repair insulation/harness damage or replace internally shorted component
Related Codes
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Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.