OBD-II code · Network
U0289 Lost Communication With DC/AC Converter Control Module B
The vehicle bus reports loss of communication with DC/AC inverter module B. Drive-motor torque commands or AC-outlet supply that route through this inverter are unavailable, putting the EV/hybrid drivetrain into a degraded mode.
Is it safe to drive with U0289?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Dc AC Converter Module B, Vehicle Bus Wiring
Related codes
- U0288Lost Communication With DC/AC Converter Control Module A
- U0286Lost Communication With Radiator Anti-Tamper Device
- U0287Lost Communication With Transmission Fluid Pump Module A
- U028ALost Communication With Transmission Fluid Pump Module B
- U028BLost Communication With Active Grille Air Shutter Module C
- U028CLost Communication With Active Grille Air Shutter Module D
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.