Code Definition

B1572 — Door Ajar LR Circuit Open

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

About B1572

B1572 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 B1572 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1572 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 circuit to detect whether the door is open or closed. DTC B1572 sets when the BCM detects a sustained open circuit condition in the left rear door ajar switch circuit, meaning the signal wire shows a permanently disconnected state regardless of door position. The door ajar switch is normally a plunger style switch within the door latch assembly that grounds the signal wire when the door is open, monitored by an internal pull up reference inside the BCM. When this code is set, the instrument cluster typically shows a continuo...

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