U04C0Invalid Data Received From Battery Management Control Module
- Generic OBD-II code · Network
- How the car detects it
- The battery management control module behind U04C0 is not always the main controller of the high-voltage battery. Mazda uses the code on the CX-90 (2024–2026) and CX-70 (2025–2026) plug-in hybrids for their backup power unit: the PCM stores U04C0:00, which Mazda describes as an internal malfunction there, often together with P143B, U3008 or U3003 and a lit hybrid system warning. Bulletin SA-030-26 traces this to the small AGM sub battery under the passenger floor and has it replaced. GM's 2024 table 24OBDG07 has only the lost-contact sibling U01BF, set by the gateway after 6.5 s without messages from a module called LIBI, Type B, and no U04C0 entry. Not the same as U0412, the invalid-data code of the battery energy control module.
- What you may notice
- Hybrid system warning light on
- Further codes for the backup power supply stored
- Likely causes
- LikelyWeak backup sub battery (Mazda CX-90/CX-70 PHEV, AGM YTZ7S)
- PossibleBattery management or backup power unit internally faulty
- RareBus wiring or connector fault to the module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.