What does it mean?
B1986 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Liftgate Latch Control 2 Circuit Open .
Symptoms
- One latch direction does nothing, with no click or motor noise
- Gate has to be pulled shut or opened by hand
- Ajar warning does not clear, or the gate reports open while closed
- Powered operation disabled with a warning chime
- Complaint often starts right after rear body, glass or trim work
Likely causes
- Latch connector left unplugged or not fully seated after service
- Broken conductor in the flexing section of the liftgate harness
- Open winding on the second actuator circuit
- Corroded or burnt terminal that has lost contact
- Terminal backed out of the connector body
- Failed crimp or a repair splice that has separated
- Open output stage inside the liftgate control module
How to fix it
- Command the latch outputs with a scan tool and note which direction produces no reaction at all
- Reseat the latch connector and inspect the terminals for corrosion, burning and backed out pins
- Measure the second actuator winding at the latch connector, an open reading condemns the assembly
- With the module unplugged, check continuity of the control 2 wire while flexing the harness through the boot
- Cut back the insulation at any suspicious point to look for broken strands inside
- Repair with a soldered or properly crimped and sealed joint, or fit a new latch assembly
- Clear the code, run several complete gate cycles and confirm both directions operate every time