What does it mean?
B1382 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Tailgate Closer Unit Full Latch Switch Circuit Malfunction .
Symptoms
- Tailgate ajar warning stays on even with the gate firmly shut
- Interior lights stay on and the alarm may not arm, which can flatten the battery overnight
- Power close cycles repeatedly or the cinch keeps trying because the module never sees full latch
- On some vehicles the vehicle will not allow power tailgate operation at all
- The gate can be pushed or slammed shut but the warning does not clear
Likely causes
- Full latch switch inside the latch worn or contaminated so it never closes cleanly
- Striker out of adjustment or the tailgate seals so firm that the latch cannot reach full latch
- Water and corrosion inside the latch body after a seal, lamp or screen leak
- Broken wire in the hinge boot between the latch and the tailgate module
- Damp or corroded latch connector at the bottom of the tailgate
- Latch mechanism stiff with old grease, stopping just short of full latch
- Module input stage fault
How to fix it
- Watch the full latch and half latch states on the scan tool while closing the gate by hand and note which one fails to change
- Inspect the latch connector for water and corrosion, and dry the tailgate cavity if it is wet
- Check striker alignment and the wear marks on it; a badly aligned striker keeps the latch just short of full travel
- Clean and relubricate the latch, then close the gate slowly and watch the switch state again
- Measure the full latch switch circuit for an open or a short with the latch unplugged
- Flex the hinge boot harness while monitoring for dropouts
- Replace the latch or closer assembly when the internal switch is proven faulty, then verify the ajar warning clears