Code Definition

B1308 — Oil Level Switch Circuit Short To Ground

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

About B1308

B1308 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 B1308 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.

B1308 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 in the engine sump and warn the driver before damage occurs. The oil level switch is typically a float operated reed switch or a thermistor based level sensor mounted in the oil pan, signalling the control module via a low side switched circuit that the module pulls high through an internal reference resistor. DTC B1308 sets when the control module detects a continuous ground or near zero ohm path on the switch signal circuit when an open or floating high state should be p...

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