Oil Change Reset Button Circuit Failure
The vehicle's oil change reminder button or its wiring has an electrical problem, similar to a doorbell that won't ring because the button is broken or disconnected. The ECU can't detect when you press the reset button to clear the oil change interval reminder.
The ECU monitors the voltage signal from the oil change reset button circuit when the ignition is in the ON position. It expects to detect a brief voltage drop or signal transition when the button is pressed. A fault is recorded when the ECU cannot establish continuity or detect the expected signal pattern from the button circuit.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Button Circuit Voltage | 5V (unpressed) to 0V (pressed) | No voltage transition detected or open circuit |
| Signal Detection | Button press recognized within 500ms | No signal response after multiple press attempts |
Code B1380 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B1380 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.