When your 2020 Honda Civic's trunk release stops working from both the interior lever and the key fob, you're locked out of your trunk without the physical key. This comprehensive failure suggests a system-wide issue rather than a single switch problem.
Civic Trunk Release System
The Civic trunk opens via: the interior trunk release button/lever, the key fob unlock function (holding the button), or the physical key in the trunk lock cylinder. Electronic release uses a motorized latch actuator controlled by the body control module.
Why All Methods Fail
When both interior and fob release fail, causes include: failed trunk latch actuator (most common), blown trunk release fuse, body control module not commanding release, damaged wiring to the trunk area, or mechanical latch jamming. The actuator or its power supply is usually the culprit.
Symptoms and Observations
Listen for any sound from the trunk when pressing release buttons. No sound at all suggests electrical failure (fuse, wiring, actuator). A click without release indicates mechanical binding. The trunk lock cylinder should still work if the latch itself isn't damaged.
Diagnostic Process
First, try the physical key in the trunk lock to determine if the latch is mechanically functional. Check the trunk release fuse. Test for power at the latch actuator connector when release is commanded. Check wiring continuity between the body control module and actuator.
Repair Options
Fuse replacement is the quickest fix if blown. Latch actuator replacement is common—the motor wears out over time. Wiring repairs address harness damage. In rare cases, the body control module may need diagnosis. Emergency access through rear seat fold-down allows getting into the trunk to work on the latch.