Missing Latch Signal During Power Sliding Door Unlatch
The vehicle's power sliding door won't unlock because the control module isn't receiving a confirmation signal that the door latch released. It's like pressing an unlock button but not getting feedback that the lock actually opened.
The ECU sends an unlock command to the power door latch actuator and expects to receive a latch position signal confirming the unlock occurred within a specific timeframe. If this feedback signal is missing or delayed beyond the threshold, the fault is logged. The module continuously monitors voltage and signal timing to ensure proper latch operation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Latch Signal Response Time | 200-500 milliseconds after unlock command | No signal or delayed >1000ms |
| Latch Position Feedback Voltage | 4.5-5.5V (locked), 0.5-1.5V (unlocked) | Out of range or no transition detected |
Code B2602 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, B2602 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.