B1381 — Oil Change Reset Button Circuit Open #

The code description may vary depending on the vehicle manufacturer. Below are known variations of the code label:

• Oil Change Reset Button Circuit Open (Generic / Most OEMs)
• Service Interval Reset Switch Circuit Open (Volkswagen/Audi)
• Maintenance Reminder Reset Switch Circuit Open (Toyota/Lexus)

Summary of code B1381 #

The B1381 diagnostic trouble code (DTC) indicates that the oil change reset button circuit is open. This means the vehicle’s onboard computer (also called the Engine Control Module or ECM) has detected an electrical break or disconnect in the circuit responsible for registering when the reset button is pressed after an oil change. The oil change reset button is a part of the vehicle’s maintenance reminder system, which helps track oil change intervals and alert the driver when service is due.

While this code is not linked to engine performance or immediate drivability, it prevents the maintenance system from accurately tracking or resetting the oil change interval. It may lead to persistent reminders on your dashboard or an inability to clear maintenance warnings, potentially causing driver confusion or neglect of scheduled service. Understanding and addressing this code ensures your maintenance system works as intended and helps you stay on top of routine service.

Common symptoms for code B1381 #

The symptoms of B1381 are generally limited to the maintenance reminder system. You won’t notice drivability issues, but the dashboard may display persistent alerts. Here’s what you’re likely to experience:

• Unable to reset oil change or maintenance reminder after service
• Maintenance light or “service due” message remains on
• No confirmation or feedback when pressing the reset button
• Possible warning chime after startup
• Maintenance interval continues counting down erroneously

Probable causes of code B1381 (by frequency) #

The B1381 code typically results from an electrical fault in the oil change reset button circuit. Often, the problem is straightforward—think of it as a broken link in a simple chain. The most frequent causes, in order, are:

1. Faulty or worn oil change reset button (internal switch failure)
2. Damaged or disconnected wiring at the reset button
3. Corroded or loose connector in the reset button circuit
4. Open circuit or broken wire between the reset button and the vehicle’s computer (ECM)
5. ECM or body control module (BCM) fault (rare)

Step-by-step diagnostic for B1381 #

A methodical approach is the key to pinpointing the cause of B1381. Start with visual checks, then move to electrical testing:

• 1. Check for other DTCs related to the maintenance system or wiring.
• 2. Inspect the oil change reset button for signs of physical damage, stickiness, or lack of tactile feedback.
• 3. Locate and inspect the wiring harness and connectors at the reset button. Look for broken wires, corrosion, or loose pins.
• 4. Use a multimeter to test for continuity between the reset button and the ECM/BCM connector. An open circuit confirms a wiring break.
• 5. Test the reset button’s operation with the ignition on—does it show continuity when pressed?
• 6. If the wiring and button test normal, check for ECM/BCM input using a scan tool with live data.
• 7. If all external components are functional, suspect an internal module fault (rare; consult OEM documentation).

Possible repairs for B1381 #

Once you’ve identified the source of the open circuit, the right repair should be clear. Address the most likely culprits first:

• Replace the oil change reset button if it fails continuity testing or is physically damaged
• Repair, reconnect, or replace damaged wiring or connectors at the reset button
• Clean any corroded connectors and apply dielectric grease
• Repair or replace the wiring harness between the button and ECM/BCM as needed
• If confirmed, replace or reprogram the ECM/BCM (only after all other causes are eliminated)

Can you drive with code B1381? #

Yes, you can drive with this code. The B1381 code does not affect engine performance, braking, or critical safety systems. However, the inability to reset your maintenance reminder means you could miss scheduled oil changes if you rely solely on the dashboard indicator. It’s best to resolve the issue soon to keep your maintenance tracking accurate and avoid confusion.

Vehicles most affected by B1381 #

While B1381 is a generic OBD-II code, it’s most commonly reported on vehicles that use a physical oil change or maintenance reset button, especially models with separate maintenance interval systems. The following makes are frequently associated with this code:

• Toyota / Lexus (especially early 2000s–2010s models)
• Volkswagen / Audi (certain models with dashboard reset switches)
• Honda / Acura (some models with maintenance reset feature)
• Ford / Lincoln (trucks and SUVs with dedicated reset buttons)

Common mistakes & best practices for B1381 #

Misdiagnosing B1381 is easy if you overlook the simple things—like a sticky button or a loose connector. Avoid these pitfalls by following best practices:

• Don’t replace the ECM/BCM unless you’ve verified all wiring and button functionality
• Always check for physical damage or debris around the reset button before testing circuits
• Be sure to test the button itself—sometimes the fault is mechanical, not electrical
• Clear the code and retest after any repair to confirm the issue is resolved
• Consult OEM wiring diagrams for your specific vehicle to avoid confusion

FAQ express — B1381 #

Still have questions? Here are quick answers to common concerns:

• Q: Will this code cause any engine problems?
  A: No, B1381 only affects the maintenance reminder system; your engine’s operation is not impacted.
• Q: Can I reset the maintenance light another way?
  A: On some vehicles, yes—you may be able to reset it using a scan tool or a specific ignition/key sequence. Check your owner’s manual or consult a professional.