OBD Guide
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B2451

Auxiliary Heater Fuel Pump Circuit Short to Ground

B2451 is an OBD-II diagnostic trouble code meaning: Auxiliary Heater Fuel Pump Circuit Short to Ground. Common causes: damage to wiring or wiring harness, heater fuel pump malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Auxiliary heater does not work
  • Check Engine light comes on
  • Increased fuel consumption (if the heater tries to work)

Causes

  • Damage to wiring or wiring harness
  • Heater fuel pump malfunction
  • Short circuit in pump relay
  • Problems with the heater control unit

How to Fix

  1. Check the integrity of the wiring and wiring harness
  2. Diagnose the heater fuel pump
  3. Check relays and circuit fuses
  4. Test the heater control unit

Related codes

B2450B2452P0230

FAQ

What does the B2451 code mean?

B2451 is an OBD-II diagnostic trouble code that indicates: Auxiliary Heater Fuel Pump Circuit Short to Ground

What causes a B2451 error code?

The most common causes of B2451 include: Damage to wiring or wiring harness; Heater fuel pump malfunction; Short circuit in pump relay; Problems with the heater control unit.

How do I fix a B2451 diagnostic trouble code?

To fix B2451: Check the integrity of the wiring and wiring harness. Diagnose the heater fuel pump. Check relays and circuit fuses. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2451?

Limited driving only, diagnose soon

How much does it cost to fix B2451?

The estimated repair cost for B2451 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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