Code Definition

B2450 — Aux Heater Glow Plug Circuit Open

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2450

B2450 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2450 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2450 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The B2450 code indicates that the auxiliary heater control module has detected an open circuit on the glow plug ignition circuit. Auxiliary heaters such as Webasto or Eberspacher units are independent fuel fired cabin heaters fitted to diesel vehicles in cold climates to provide rapid cabin warmth and engine pre warming without idling the main engine. The glow plug inside the heater chamber ignites the atomised diesel fuel during start up, and the control module drives the plug while monitoring the current draw to confirm the plug is electrically present and conducting. This code sets when the...

Join TaT to view the complete code information and diagnostic details.

Quick Facts