No Latch Signal Sensed on Closing and Door Reversed
Your vehicle's door latch sensor isn't detecting when the door closes properly, like a light switch that won't register when flipped. The ECU also detected the door moving in reverse when it shouldn't be.
The ECU monitors the door latch switch signal during closing cycles and expects a clean latch confirmation within a specific time window. It also detects abnormal reverse motion of the latch actuator, which indicates mechanical binding or electrical faults.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Latch Signal Detection Time | Signal present within 1.5-2 seconds of door close command | No signal detected or signal present after 3+ seconds |
| Latch Actuator Direction | Forward motion only during close cycle | Reverse/backward motion detected during normal close operation |
Code B2601 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, B2601 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.