U01BFLost Communication With Battery Management Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- A battery management control module watches cell voltages, temperatures and current and decides how much power a pack may deliver or accept. The J2012 name does not tie it to the high-voltage battery. GM's 2024 and 2025 tables (24OBDG07, 25OBDG03B) assign U01BF00 to the central gateway module, which sets it when supervised messages from a unit GM calls LIBI are missing for 2.5 times their nominal period, with supply above 7 V and an active power mode; the fault matures after 6.5 s and is Type B, two trips. No other manufacturer documents the code publicly. Depending on what the module guards, expect battery or electrical warnings and limited charging or power. U04C0 is the invalid-data partner, U0111 the battery energy control module A, U01B0 the 12 V battery sensor.
- What you may notice
- Battery or electrical system warning
- Charging or drive power limited
- MIL on (GM Type B)
- Likely causes
- LikelyBus wiring or connector between gateway and battery module damaged
- PossibleModule supply interrupted or 12 V voltage too low
- RareBattery management control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.