Decklid Release Circuit Short To Battery
The trunk/decklid release circuit is shorted directly to battery power, meaning the control module is detecting constant maximum voltage when it should be variable. Think of it like a light switch stuck in the 'on' position—the circuit can't control the release properly because power is always flowing.
The body control module monitors voltage on the decklid release solenoid control line. It expects to see voltage rise and fall as it commands the solenoid on and off. A short to battery causes the voltage to remain at battery level (12-14V) regardless of the module's command signals, triggering a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Decklid Release Control Voltage | 0V (off) to 12V (on) under module command | Constant 12V+ regardless of command state |
| Solenoid Current Draw | 1-3A when activated, 0A when deactivated | Continuous current draw indicating short path |
Code B1553 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, B1553 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.