U0223Lost Communication With Door Window Motor B
- Generic OBD-II code · Network
- How the car detects it
- U0223 points to door window motor B dropping out of communication; GM lists it in PIT5981B together with A, C and D for its 2021–2025 full-size SUVs. Smart motors keep learned data: Atmel's AVR480 reference stores blocking points and anti-pinch parameters in EEPROM and acquires them while the window is first operated. GM TechLink (April 2021, Equinox and Terrain 2018–2021) warns that after unplugging the motor or the door harness the motor must be normalised, otherwise express-up and the small upward index when the door shuts are lost. A lost learn is a different fault from U0223, though: a motor without its learned values still answers on the bus. Both often show up after work inside the door. No MIL.
- What you may notice
- Window in the affected door does not move at all
- Express-up unavailable
- Fault appears right after door panel or glass work
- Likely causes
- LikelyMotor or door connector not fully reconnected after door trim work
- PossibleBroken wire in the door harness
- PossibleElectronics of window motor B failed
- RareBlown fuse or missing ground for the motor
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.