Code Definition

B2591 — Detent Signal Missing During Unlatch

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

About B2591

B2591 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.

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 B2591 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 B2591 fault code indicates that the power door or liftgate control module did not detect the expected detent signal transition during an unlatch operation. Power operated latches use multiple position detents (primary latch, secondary latch, fully open) reported by integrated microswitches, and the control module monitors these signals to confirm that the latch has cleared each detent during powered release. When the detent signal fails to transition within the expected time window, this code is set. The driver may notice that the power latch will not release the door, the door must be ope...

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