U0289Lost Communication With DC/AC Converter Control Module B
- Generic OBD-II code · Network
- How the car detects it
- U0289 belongs to a second DC/AC converter, unit B, in vehicles that generate mains-voltage alternating current at two points, for example a small inverter for a console socket and a stronger one for the bed, or one converter per group of outlets. No manufacturer documents U0289 or describes a converter B in public material. Unit A shows how such a check behaves: GM's body control module on the 2026 Colorado and Canyon flags lost contact as U0288, falsely even on trucks without the outlet. GM's 2023 Silverado and Sierra programme, which later activated the inverter for dashboard and bed outlets by adding a power control module and reprogramming the BCM, shows that option coding decides which converters the network expects. Only the sockets fed by B should fail.
- What you may notice
- Some outlets dead while others still work
- Power outlet warning message
- Likely causes
- PossibleNetwork configured for a second converter that is missing or not activated
- PossibleNo supply or ground at converter B (fuse, connector)
- PossibleBus wiring or connector to converter B damaged
- RareConverter B internally failed
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.