Code Definition

B2151 — Power Supply #2 Circuit Short to Ground

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

About B2151

B2151 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 B2151 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 B2151 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 B2151 fault code indicates that a body control system has detected a short to ground condition on the Power Supply #2 circuit. This is a secondary battery voltage feed used to power a control module, accessory motor, or sensor within a body system such as seats, mirrors, door locks, lighting, or HVAC actuators, depending on the application. The control module monitors the Power Supply #2 line and sets this code when the measured voltage drops abnormally low because of a direct short to chassis ground, which often disables the affected feature or drops the module into a reduced function sta...

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