Code Definition

B2468 — Aux Heater Coolant Pump Circuit Short to Ground

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

About B2468

B2468 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 B2468 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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 B2468 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 auxiliary heater control module drives the auxiliary coolant pump through a low side switched circuit, applying ground to the pump while supplying battery voltage to the other terminal. DTC B2468 sets when the module detects the pump control circuit is shorted to chassis ground outside of its commanded operation, either continuously or intermittently. This shows up as excessive current flow, pump operation when not commanded, or a voltage measurement on the control wire that does not match expected on or off states. When this code is set, the auxiliary heater may refuse to operate to preve...

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