What does it mean?
B1892 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Liftgate Control Circuit 2 High .
Symptoms
- Power liftgate operates in one direction only or refuses to run
- Audible warning and flashing lamp when power operation is attempted
- Gate stops partway and must be finished manually
- Fault may only appear when the gate is in a certain position, as the conduit flexes
- Occasional operation after a reset, then the same failure
Likely causes
- Control wire shorted to a battery feed inside the tailgate or in the hinge conduit
- Water bridging pins in the spindle drive or module connector
- Open circuit or high resistance on the return side, letting the output float high
- Failed spindle drive motor with an internally open winding
- Corroded terminals raising circuit resistance so the module measures high
- Module output driver failed in the open or shorted to supply condition
- Incorrect wiring after a used gate, motor or module was fitted
How to fix it
- Check the battery and the drive circuit fuse first, then read the module codes
- Watch the module output states in live data while commanding the gate to move
- Unplug the spindle drive and check whether the control wire has voltage when it should not, which confirms a short to power
- With the connector off, check the motor windings for an open circuit and compare both control paths
- Inspect the hinge conduit and flex the loom while measuring to expose a break or a short
- Repair the harness with proper terminals and secure it clear of sharp edges inside the gate
- Replace the liftgate control module only after wiring and motor have been verified