Left Power Sliding Door Open/Close Output Circuit Short to Battery
The power sliding door's control circuit is shorted to the battery's positive voltage, preventing the door from operating normally. Think of it like a electrical wire touching the live battery terminal instead of flowing through the proper control circuit.
The ECU monitors the voltage and current flowing through the left sliding door motor circuit. It expects to see a controlled voltage signal that switches on and off to operate the door motor. When the circuit shorts directly to battery voltage, the ECU detects an abnormal high voltage condition that exceeds normal operating thresholds.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Door Motor Circuit Voltage | 0-14V (controlled PWM signal) | Continuous 12-14V without modulation |
| Door Motor Current Draw | 2-8A (during operation) | >10A or no current response to command |
Code B2557 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, B2557 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.