Trunk Open Switch Circuit Short to Ground
The trunk open switch circuit is shorted to ground.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The system thinks the trunk is open because the circuit is shorted directly to ground instead of sending a proper signal.
What the computer is actually seeing
The body control module expects a voltage signal from the trunk open switch that fluctuates between 0 volts (closed) and 5 volts (open). In this case, it's seeing 0 volts continuously, indicating a short to ground.
What a healthy reading looks like
0 volts when trunk is closed, 5 volts when trunk is open.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the trunk open switch for physical damage and test for continuity with the trunk closed. If it's closed, you should measure near 0 ohms on the switch itself.
- 22. Check the wiring from the switch to the body control module for any visible damage, especially near the trunk hinge.
- 33. With the trunk closed, measure the voltage at the body control module connector for the trunk open circuit. It should show near 0 volts. If it does, proceed to check continuity back to the switch.
- 44. If there's continuity and the switch is functioning properly, inspect the body control module for faulted components.
Common causes
- Damaged wiring in trunk area
- Faulty trunk open switch
- Corroded connectors near the trunk
- Water ingress causing shorts in wiring
Typical repair cost
$$$ - $$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, the vehicle is drivable, but the trunk warning light may stay illuminated.
Will this code come back after clearing?
If the cause isn't fixed, the code will likely return within days or weeks.
Why does this code pair with other trunk codes?
Related codes may indicate issues with the same circuit or component, like multiple switches or faulty wiring.
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