Code Definition

B1307 — Oil Level Switch Circuit Short To Battery

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

About B1307

B1307 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 B1307 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1307 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 detect low oil level conditions in the engine sump. The oil level switch is typically a float operated reed switch or a thermistor based sensor mounted in the oil pan, signalling the control module via a low side switched circuit that is normally referenced to ground or pulled high through an internal pull up. DTC B1307 sets when the control module detects battery voltage on the switch signal circuit when ground or an open should be present, indicating a short to battery somewhere between the ...

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