U014ALost Communication With Battery Energy Control Module C
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U014A concerns a third battery energy control module, C. Hybrid and electric vehicles use such units to watch cell voltages, temperatures and state of charge and to protect the pack; distributed or modular designs give several sub-packs their own controller, which is where letters beyond A and B come in. No manufacturer documents U014A publicly. The best documented relative is U0111 for module A: in GM's 2018 hybrid tables the hybrid powertrain controller flags missing BECM messages after 500 ms, once bus communication has run for at least 5 s and the battery holds 10.2 V or more, and rates it Type B with MIL after two trips. Without data from C the system cannot judge that part of the pack, so expect reduced power, blocked charging or no ready mode. U0111, U0112 and U014C cover modules A, B and D, U044B invalid data from C.
- What you may notice
- Hybrid or EV system warning, reduced power
- Charging refused or stopped
- Vehicle may not enter ready mode
- Likely causes
- LikelyLow-voltage supply, fuse or ground of battery module C missing
- PossibleBus wiring or connector inside or at the battery pack damaged or corroded
- RareMoisture or coolant in the pack affecting module C
- RareBattery module C internally faulty or not programmed
- 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.