B2451
Serious Severity (Level 4)Aux Heater Fuel Pump Circuit Short to Ground
B2451 usually means aux Heater Fuel Pump Circuit Short to Ground.
Can you still drive with B2451?
⚠️Limited driving — get to a repair shop within 1–2 days. Avoid long trips and highway speeds.
Typical repair cost: $180 – $1000
Severity Level 4 — Serious
This code indicates a serious issue that can cause noticeable driveability problems and potential engine damage if not addressed. The vehicle should be taken to a mechanic as soon as possible. Extended driving is not recommended.
Common Symptoms
- Engine not working or completely dead
- Engine blowing fuses when activated
- Check Engine Light illuminated
- Zero voltage on the fuel pump/fuel pressure system circuit — short pulls signal to ground
Possible Causes
- Chafed or pinched wire in the fuel pump/fuel pressure system circuit — wire insulation worn through, copper touching vehicle chassis/ground
- Failed fuel pump with internal short to ground — most common when the component gets wet or overheats
- Corrosion in the electrical connector allowing current to leak to the connector shell/ground
- Damaged wiring harness where it passes through a body panel grommet or near a sharp metal edge
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 ($10-149 at shop, free at auto parts store for basic scan)
- Visually inspect the fuel pump/fuel pressure system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $128 diagnostic fee at shop)
- Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($83-319 depending on accessibility)
- If fuel pump is internally shorted, replace with a quality OEM or OEM-equivalent aftermarket unit ($150-800)
- Clean all ground points related to the fuel pump/fuel pressure system — remove bolt, sand contact surface to bare metal, apply dielectric grease, and torque to spec ($35-135 at shop)
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 B2451 mean?
B2451 stands for "Aux Heater Fuel Pump Circuit Short to Ground". B2451 usually means aux Heater Fuel Pump Circuit Short to Ground.
Can you drive with B2451?
Limited driving — get to a repair shop within 1–2 days. Avoid long trips and highway speeds.
How much does it cost to fix B2451?
Repair costs for B2451 typically range from $180 to $1000, 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 ($10-149 at shop, free at auto parts store for basic scan); Visually inspect the fuel pump/fuel pressure system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $128 diagnostic fee at shop); Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($83-319 depending on accessibility).
Will B2451 clear itself?
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