Code Definition

B2250 — All Doors Unlock Relay Circuit Failure

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

About B2250

B2250 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 B2250 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B2250 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 Body Control Module (BCM) controls the all doors unlock relay by switching the relay coil low side to ground, which energises the relay to send power to all door lock actuators in the unlock direction simultaneously. DTC B2250 sets when the BCM detects a circuit failure on the all doors unlock relay coil control circuit, including open coil, short to ground, short to battery, or unexpected feedback voltage when the relay is commanded. The BCM uses an internal driver with monitoring capability and runs self diagnostic checks on the circuit each ignition cycle. When this code is set, the all...

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