OBD Guide
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B2449

Auxiliary Heater Glow Plug Circuit Short to Ground

B2449 is an OBD-II diagnostic trouble code meaning: Auxiliary Heater Glow Plug Circuit Short to Ground. Common causes: damage to wire insulation, glow plug 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 turn on
  • Reduced interior heating efficiency
  • Error indication on the instrument panel

Causes

  • Damage to wire insulation
  • Glow plug malfunction
  • Problems in the wiring harness
  • Short circuit in power supply

How to Fix

  1. Check the integrity of the glow plug circuit
  2. Inspect the wiring harness for damage
  3. Check glow plug resistance
  4. Replace glow plug if necessary
  5. Eliminate short circuit in the circuit

Related codes

B2448B2450P0380

FAQ

What does the B2449 code mean?

B2449 is an OBD-II diagnostic trouble code that indicates: Auxiliary Heater Glow Plug Circuit Short to Ground

What causes a B2449 error code?

The most common causes of B2449 include: Damage to wire insulation; Glow plug malfunction; Problems in the wiring harness; Short circuit in power supply.

How do I fix a B2449 diagnostic trouble code?

To fix B2449: Check the integrity of the glow plug circuit. Inspect the wiring harness for damage. Check glow plug resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2449?

Limited driving only, diagnose soon

How much does it cost to fix B2449?

The estimated repair cost for B2449 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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