OBD Guide
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B2450

Auxiliary Heater Glow Plug Circuit Open

B2450 is an OBD-II diagnostic trouble code meaning: Auxiliary Heater Glow Plug Circuit Open. Common causes: broken wires in the glow plug power circuit, malfunction of the glow plug itself. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • No additional heater operation
  • Increased interior warm-up time in winter
  • Check Engine light comes on

Causes

  • Broken wires in the glow plug power circuit
  • Malfunction of the glow plug itself
  • Problems with the power relay
  • Short circuit in the circuit
  • Malfunction of the heater control unit

How to Fix

  1. Check the condition of the glow plug (resistance)
  2. Check the integrity of the wiring harness to the spark plug
  3. Check the operation of the power relay
  4. Check circuit fuses
  5. If necessary, replace the spark plug or repair the wiring harness

Related codes

P0380P0381B2440

FAQ

What does the B2450 code mean?

B2450 is an OBD-II diagnostic trouble code that indicates: Auxiliary Heater Glow Plug Circuit Open

What causes a B2450 error code?

The most common causes of B2450 include: Broken wires in the glow plug power circuit; Malfunction of the glow plug itself; Problems with the power relay; Short circuit in the circuit.

How do I fix a B2450 diagnostic trouble code?

To fix B2450: Check the condition of the glow plug (resistance). Check the integrity of the wiring harness to the spark plug. Check the operation of the power relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2450?

Limited driving only, diagnose soon

How much does it cost to fix B2450?

The estimated repair cost for B2450 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat