Code Definition

B1571 — Door Ajar LR Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1571

B1571 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1571 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.

B1571 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) monitors the left rear door ajar switch to determine whether the door is open or closed. DTC B1571 sets when the BCM detects an electrical fault in the left rear door ajar switch circuit, such as an open circuit, short circuit, or a signal that does not change state during door movement. The door ajar switch is typically a plunger style switch integrated into the door latch assembly that grounds the signal wire when the door is open and releases the ground when the door is closed. When this code is set, the driver may notice the door ajar warning illuminated on th...

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