Code Definition

B1306 — Oil Level Switch Circuit Open

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

About B1306

B1306 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 B1306 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.

B1306 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 Engine Control Module (ECM) monitors the oil level switch circuit to determine when engine oil has dropped below the minimum safe level. The switch is typically a magnetic reed or hall element actuated by a float in the oil pan, providing a simple open or closed signal back to the controlling module. DTC B1306 is set when the module detects that the oil level switch circuit is permanently open, meaning the expected change in switch state is not seen or the wiring is broken at one or more points. When this code is set the low oil level warning lamp may stay illu...

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