Code Definition

B1377 — Oil Change Lamp Circuit Failure

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

About B1377

B1377 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 B1377 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1377 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 oil change lamp circuit is part of the body or instrument cluster control system that drives the maintenance reminder indicator on the dashboard. DTC B1377 sets when the controlling module detects a general fault on the lamp control circuit that does not match a specific short to power or short to ground pattern, typically an open circuit, an intermittent connection, or a current draw outside the expected range for the lamp load. The module monitors the circuit by checking the voltage on the output side against the commanded state, so a missing bulb, an open wire, or a corroded terminal ca...

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