What does it mean?
B1380 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Tailgate Closer Unit Neutral Switch Circuit Malfunction .
Symptoms
- The power cinch will not pull the tailgate from half latch to fully closed
- Tailgate ajar warning stays on even though the gate looks shut
- Interior lights stay on and the alarm may refuse to arm
- Power tailgate operation is disabled until the fault clears
- The tailgate has to be slammed shut by hand
Likely causes
- Neutral switch inside the closer unit worn or contaminated with old grease and road dirt
- Cinch lever stuck away from its rest stop so the switch never changes state
- Water inside the closer unit after a tailgate seal or lamp gasket started to leak
- Chafed or broken wire between the closer unit and the tailgate control module
- Corroded connector at the closer unit, which sits low in the tailgate where water collects
- Closer motor or gearbox binding, holding the mechanism out of neutral
- Module input fault
How to fix it
- Watch the neutral switch state on the scan tool while cycling the latch, using the tool output test if one is available
- Inspect the closer unit connector for water, corrosion and pushed-back terminals
- Check that the cinch lever returns freely to its rest stop, then clean and relubricate the latch mechanism
- Measure the switch circuit at the module connector for an open, a short to ground and a short to power
- Flex the harness in the hinge boot while monitoring, since that section takes all the movement
- Replace the closer or latch assembly once its internal switch is proven faulty
- Re-initialise the power tailgate after the repair if the manufacturer specifies a relearn