Code Definition

B1520 — Hood Switch Circuit Open

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

About B1520

B1520 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 B1520 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.

B1520 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 Hood Switch is a body system component that detects whether the vehicle's hood is open or closed and provides this status to the body control module, alarm module, or central electronic module depending on the platform. The switch is normally a plunger or magnetic reed type fitted to the hood latch or hinge area, and forms part of the anti theft, security, and convenience systems. DTC B1520 specifies the open circuit fault mode, meaning the controlling module sees no continuity through the hood switch circuit when continuity is expected, indicating a broken wire, disconnected plug, or fail...

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