B1381

Oil Change Reset Button Circuit Open

Body Network/Communication Oil Service Reminder Circuit 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The oil change reset button circuit isn't completing electrical continuity—think of it like a light switch that's broken or disconnected. The ECU can't detect when you press the button to reset the oil service interval reminder.

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Symptoms You May Notice

3 known symptoms for this code
Oil change service reminder won't reset
Oil change indicator light stays illuminated
No electrical response when pressing reset button
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the oil change reset button circuit for a voltage signal (typically 5V or 12V) when the button is pressed. The circuit should complete and drop to ground when activated. A fault occurs when the ECU detects an open circuit—no signal is received despite button activation attempts.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Reset Button Signal Voltage 5V–12V when pressed; 0V baseline No voltage change detected; remains open
Circuit Resistance Less than 5 ohms when activated Infinite resistance; circuit open
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Reset button connector
Inspect and reseat the connector at the reset button; clean corrosion from pins with a dry brush.
2
Wiring harness
Check the wiring from the button to the ECU module for breaks, loose connections, or pinched wire.
3
Reset button assembly
Replace the button switch if internal contacts are worn or the mechanical mechanism is damaged.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1381 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.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B1381

What happens after you fix the fault

Once the fault is repaired, B1381 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.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.