U0112Lost Communication With Battery Energy Control Module B
- 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
- U0112 is logged when a second battery energy control module, B, stops talking on the bus while a partner still waits for its data. Mitsubishi's 2018 Outlander PHEV is a documented case: the main battery management unit (BMU) supervises a sub-BMU inside the traction pack and stores U0112 once that unit's frames have been missing for 0.3 s, after the BMU has seen 8–16 V for more than 2 s; the check follows drive-cycle pattern 1, and the CAN pair between the two units should measure 100–140 Ω. VW's 2014 Touareg Hybrid lists the code for absent BECM messages, and GM's Saab 9-4X list assigns it to its battery module. Module A has U0111. Typical results are a hybrid warning, less electric range or no READY.
- What you may notice
- MIL or hybrid system warning
- Reduced electric range or electric drive unavailable
- Vehicle does not reach READY
- Likely causes
- LikelyOpen, shorted or chafed CAN lines between main and sub battery module inside the pack
- PossibleCorroded or loose connector at the traction battery
- PossibleBattery module B internally faulty or without supply
- RareReceiving main battery module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.