U0298Lost Communication With DC/DC Converter Control Module A
- Generic OBD-II code · Network
- How the car detects it
- A DC/DC converter adapts one direct voltage to another. Hybrids and EVs use it to charge the 12 V system from the traction battery, while some start-stop cars use it to keep the voltage steady for sensitive electronics during an engine restart. U0298 means converter module A no longer answers on the bus. Ford's 2014 OBD code list contains U0298 without the MIL. How this converter is supervised on start-stop vehicles is visible in its invalid-data partner: GM explains in 20-NA-191, covering CT4 and CT5 of model year 2020, that the ECM switches off auto stop at the first fault and lights the MIL at the second, and FCA lists DC/DC converter A data codes for the 2019 Cherokee V6. Expect start-stop to be withdrawn; on electrified cars the 12 V battery may run flat.
- What you may notice
- Start-stop no longer active
- 12 V battery discharging, charge warning
- Electronics resetting during engine restarts
- Likely causes
- PossibleConverter connector corroded, often from water in the battery area
- PossibleBlown fuse or missing supply at converter A
- PossibleBus wiring to converter A damaged
- PossibleConverter A internally failed
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.