Network, generic

U0112 Lost Communication With Battery Energy Control Module B

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Open, shorted or chafed CAN lines between main and sub battery module inside the pack
Corroded or loose connector at the traction battery
Battery module B internally faulty or without supply
Receiving main battery module faulty

Symptoms

  • MIL or hybrid system warning
  • Reduced electric range or electric drive unavailable
  • Vehicle does not reach READY

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–6 h

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

Parts involved

battery energy control modulecan bus wiring

Related codes

U0111U0313U0413U0293

References: mitsubishitechinfo.com, static.nhtsa.gov, saabwisonline.com, law.cornell.edu.