What does it mean?
U1144 is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Power Sliding Door Module-Right .
Symptoms
- Right sliding door dead to the switch, key fob and inside handle, working only by hand
- Door stopping halfway, reopening by itself, or closing very slowly
- Chime or dash message stating that the power sliding door is not available
- Door ajar indication that does not clear
- Battery drain caused by the door module or lamps staying awake
- Scan tool cannot reach the right sliding door module
Likely causes
- Fatigued conductors in the flexible sliding door harness on the right side, broken by repeated bending
- Water and corrosion in the door or pillar connector, since the right side is often the one used most in traffic
- Blown fuse, poor supply voltage or a bad ground at the right sliding door module
- Damaged bus wiring between the door module and the rest of the body network
- Drive motor or clutch drawing excessive current, so the module stops responding
- Track, rollers or latch mechanism binding after an impact or debris in the rail
- Failure of the sliding door control module itself
How to fix it
- Watch module communication with the scan tool while the door is opened and closed slowly
- Inspect and flex-test every wire in the sliding door loom at the hinge and track transition point
- Check the door and pillar connectors for corrosion, moisture and terminal damage, and dry and repair as required
- Verify the fuse, battery feed and ground at the module using a loaded voltage drop test
- Test bus continuity from the module back to the body control module
- Inspect the track, rollers, drive cable and latch, cleaning and lubricating them so the motor is not overloaded
- Replace the module only after wiring and mechanics are proven good, then perform the door relearn procedure