What does it mean?
B1381 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Tailgate Closer Unit Release Switch Circuit Malfunction .
Symptoms
- The tailgate does not power open, because the module never sees the latch release
- The gate may release mechanically but then be cinched again immediately
- Ajar warning and interior lamps behave incorrectly
- The fob or handle command produces a click at the latch but nothing more
- The tailgate can still be opened by hand once released
Likely causes
- Release switch inside the closer unit worn out after many cycles
- Latch pawl sticking with dry or dirty grease so the release position is never reached
- Water in the latch body corroding the internal switch contacts
- Broken or chafed wire between the closer unit and the module, usually in the hinge boot
- Corroded or damp connector at the latch
- Release actuator weak, so the latch only partly releases
- Tailgate control module input fault
How to fix it
- Command the latch with the scan tool if that function is available, and watch the release switch state change
- Listen at the latch during a release attempt to hear whether the actuator moves at all
- Inspect the latch connector for water and corrosion, and check the terminals for push-back
- Clean and relubricate the latch mechanism so the pawl reaches its full release position
- Measure the release switch circuit for an open or a short with the latch unplugged
- Flex the hinge boot harness during the test to catch a broken conductor
- Replace the closer or latch assembly when the internal switch or actuator is proven faulty, then relearn the tailgate if required