What does it mean?
B1893 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Liftgate Control Circuit 2 Open .
Symptoms
- Power liftgate is completely inoperative in the affected direction
- Motor makes no sound at all when operation is requested, only the warning beeps
- Gate has to be opened and closed manually every time
- Fault may be intermittent at first, working only when the gate is at a certain angle
- Related liftgate codes may set at the same time
Likely causes
- Broken conductor in the harness that flexes through the liftgate hinge conduit, the most common failure on power gates
- Connector at the spindle drive unplugged or not latched after body or trim work
- Open motor winding inside the spindle drive unit
- Blown fuse or open feed to the drive circuit
- Corroded or backed out terminal in the module or motor connector
- Wiring cut during accessory installation in the tailgate
- Liftgate control module output driver failed open
How to fix it
- Check the fuse feeding the liftgate drive circuit before doing anything else
- Read the codes and note which drive output is open
- Confirm the spindle drive connector is fully seated and locked, since it is often left off after trim removal
- Measure continuity of each control wire from the module connector to the motor connector
- Open the hinge conduit and flex the harness while measuring, because broken strands inside intact insulation are typical here
- Repair the harness with correct terminals and a proper protective sleeve inside the conduit
- Replace the module last, only when wiring and motor have both tested good