B1381 indicates the engine control or body/instrument-panel module has detected an open circuit in the oil-change reset button (or switch) input. When this circuit is open, the button press signal cannot reach the module, so the oil-life reminder usually cannot be reset. The fault is almost always in the switch, its connector, or the wiring leading to the receiving module.
The internal contacts of the reset switch can wear out or break, creating an open circuit. This is the most common cause because the button is a mechanical component that is pressed repeatedly over the vehicle's life.
A wire can break, chafe, or pull out of its terminal between the reset button and the instrument panel or body-control module, interrupting the signal path.
Moisture, dirt, or vibration at the switch connector or module connector can cause poor contact or an open circuit, preventing the button press from being detected.
If the dash, radio, or related trim has been removed, the reset-button harness may have been pinched, left unplugged, or a connector may not be fully seated.
The receiving module's internal input circuit can fail, but this is rare. Module replacement should only be considered after the switch, connectors, and wiring have been proven good.
No. This code affects only the oil-life reset function and does not change engine operation, oil pressure, or lubrication. Just keep track of oil changes manually until it is repaired.
Almost certainly not. B1381 is a body/instrument-panel input circuit code, not a powertrain code. The oil-change reset button, its wiring, or its connector is the usual problem; the receiving module is an uncommon cause.
The reset button circuit is open, so the module never sees the button press. Replacing or repairing the button and its wiring is what allows the reminder to be reset normally.
Some vehicles allow reset through the driver information center menu or a scan tool, but many require the physical reset button circuit to be working. The exact procedure depends on the vehicle's design.