What does it mean?
B1376 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Tailgate Outer Handle Switch Circuit Malfunction .
Symptoms
- Pressing or pulling the outer handle no longer releases or opens the tailgate
- If the switch is shorted the tailgate may open repeatedly or refuse to power close because it always sees an open request
- The key fob and the inside button may still work normally
- Operation gets worse in wet weather and improves as the vehicle dries out
- A tailgate warning message or chime
Likely causes
- Water inside the outer handle switch after a rear lamp, screen or handle seal has started to leak
- Corroded connector at the handle, often with green or powdery terminals
- Broken wire in the tailgate hinge boot harness after many thousands of open and close cycles
- Switch stuck closed, so the module sees a permanent open request
- Damage or a disturbed connector after tailgate lock, camera or trim work
- Poor ground for the tailgate switch circuit
- Input fault in the tailgate or body control module
How to fix it
- Operate the handle while watching the switch input on the scan tool to see whether the signal reaches the module at all
- Remove the tailgate trim panel and inspect the handle connector for water, corrosion and salt tracking
- Dry and clean the connector, then find and reseal the leak that let water in before refitting
- Flex the hinge boot harness while watching the input for dropouts
- Test the switch for continuity when operated and a clean open at rest; replace the handle assembly if it is internally corroded
- Repair any broken wire in the boot and sleeve it so it survives the flexing
- Treat the module as the last suspect, after wiring, switch and grounds are proven