Powertrain, generic

P0EEC Battery Energy Control Module B Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Software fault or watchdog reset in module B
Low or unstable 12 V supply to the module
Internal hardware fault of module B

Symptoms

  • MIL or hybrid warning on
  • Limited electric drive or charging

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–3,000
Time0.3–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery energy cm bhv battery

Related codes

P0A1FU0413U0111P0A7F

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.