PSD Not Fully Closed During Self-Test
Your vehicle's PSD (Power Sliding Door) didn't fully close during the self-diagnostic test, similar to a door that won't latch completely. The ECU detected the door sensor signal stayed open when it should have closed.
The ECM monitors the PSD position sensor during initialization and self-test cycles. It expects the sensor to signal a fully-closed state within a defined time window and position threshold. If the sensor fails to reach the closed position signal, the ECU logs a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Door Position Sensor Voltage | 0.2-0.5V (closed) / 4.5-4.8V (open) | Remains in open range during close cycle |
| Close Cycle Completion Time | 2-4 seconds | Exceeds 5 seconds or fails to complete |
Code B2603 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, B2603 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.