P0EECBattery Energy Control Module B Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0EEC says a second battery energy control module, B, has failed its own internal checks. Large or split packs can carry more than one such controller, each watching cell voltages, temperatures and current of its part. No manufacturer documents P0EEC publicly. GM shows how the module A version P0A1F works: in its 2016 and 2019 hybrid tables a single software watchdog reset of the controller is enough, checked at 9 V or more, and the code is Type A, so the MIL lights after one trip. That a B module exists in practice is visible at Audi: on the Q5 and A7 PHEV, U041300 reports invalid data from Battery Energy Control Module B, and TSB 2065722/2 links it to software 106 or 206 in the battery junction box SX6. Network loss of the module is a U code; P0A1F covers module A.
- What you may notice
- MIL or hybrid warning on
- Limited electric drive or charging
- Likely causes
- LikelySoftware fault or watchdog reset in module B
- PossibleLow or unstable 12 V supply to the module
- RareInternal hardware fault of module B
- 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: €50 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.