Code Definition

B1311 — Power Door Unlock Circuit Open

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

About B1311

B1311 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 B1311 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.

B1311 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) or a dedicated Door Control Module drives the power door unlock function by energising the unlock side of the door lock actuator with a brief pulse of around half a second when an unlock command is received. The lock actuator is typically a reversible DC motor or solenoid integrated into the latch assembly, with separate lock and unlock drive wires running from the controlling module through the rubber door boot to the actuator inside the door panel. DTC B1311 sets when the controlling module detects an open circuit on the unlock drive output, identified by the ab...

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