B2454
Low Severity (Level 2)Aux Heater Blower Fan Circuit Open
B2454 usually means aux Heater Blower Fan Circuit Open.
Can you still drive with B2454?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $60 – $900
Severity Level 2 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Climate control working intermittently, then stopping completely
- A/C or heat output inconsistent — temperature won't adjust
- Climate control not working — no response when activated
- Infinite resistance in the climate control / HVAC circuit — broken wire or disconnected connector
Possible Causes
- Broken wire or connector pin in the climate control / HVAC system harness — common at flex points like door jambs or where wiring moves
- Disconnected or loose electrical connector — may have been bumped during other repairs
- Failed blower motor — internal open circuit from age, heat cycling, or vibration
- Corrosion completely severing a wire or connector terminal — green crust on copper wiring
- Wiring harness damage from rodent chewing — look for nesting material near the engine or under dash
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($27-100 at shop, free at auto parts store for basic scan)
- Visually inspect the climate control / HVAC system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $95 diagnostic fee at shop)
- Trace the climate control / HVAC system wiring from connector to connector with a multimeter set to continuity/resistance mode — find and repair the break in the circuit ($112-277 labor for diagnosis and repair)
- Check and reseat all connectors in the climate control / HVAC system circuit — disconnect, inspect pins, clean with electrical contact cleaner, apply dielectric grease, and reconnect firmly ($13 DIY or $81 shop minimum)
- If blower motor has failed internally (open circuit inside), replace it — don't try to repair sealed components ($50-800)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B2454 mean?
B2454 stands for "Aux Heater Blower Fan Circuit Open". B2454 usually means aux Heater Blower Fan Circuit Open.
Can you drive with B2454?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2454?
Repair costs for B2454 typically range from $60 to $900, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($27-100 at shop, free at auto parts store for basic scan); Visually inspect the climate control / HVAC system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $95 diagnostic fee at shop); Trace the climate control / HVAC system wiring from connector to connector with a multimeter set to continuity/resistance mode — find and repair the break in the circuit ($112-277 labor for diagnosis and repair).
Will B2454 clear itself?
Explore Repair Costs
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