U0111: Lost Communication With Battery Energy Control Module "A"
6 vehicles · 3 makes · $180-$600 repair
Most Reported On
U0111 is an OBD-II diagnostic trouble code meaning “Lost Communication With Battery Energy Control Module "A".” Sets when a module loses data-bus communication with Battery Energy Control Module 'A' (the high-voltage battery management controller) and no longer receives its expected messages. This code is most commonly reported on 2023-2025 Mercedes-Benz EQS SUV (EQS 450+, EQS 450 4MATIC, EQS 580 4MATIC), 2023-2025 Mercedes-Benz EQE (EQE 350+, EQE 350 4MATIC, EQE 500 4MATIC, AMG EQE 53 4MATIC+), and 2021-2022 Volvo XC40 (Recharge Pure Electric, Recharge Twin), plus 3 other vehicles, with repair costs ranging from $180 to $600.
Common Causes
Typical Repair Cost
Based on 6 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0111.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (6)
Battery Management System Diagnostic Memory Overflow Opens HV Contactors (Turtle Mode)
Battery Management System Memory Overflow Opens HV Contactors — Sudden Loss of Drive Power
Battery Management System Software Overload Triggers High-Voltage Shutdown (NHTSA 24V372000)
48-Volt Lithium-Ion Battery Reinitialization Communication Fault Draining the 12V Battery (Service Campaign 2025100004)
FAQ
What does U0111 mean?
U0111 stands for "Lost Communication With Battery Energy Control Module "A"." Sets when a module loses data-bus communication with Battery Energy Control Module 'A' (the high-voltage battery management controller) and no longer receives its expected messages.
What are the most common causes of U0111?
The most common causes of U0111 are: Open or shorted bus wiring to the battery energy control module, Corroded or loose connector / poor ground, Blown fuse / lost low-voltage power feed, Low 12V battery voltage, Failed battery energy control module. The specific cause varies by vehicle.
How much does it cost to fix U0111?
Repair costs for U0111 range from $180 to $600, depending on the vehicle and root cause.
Which vehicles are affected by U0111?
Au7o has documented U0111 across 6 vehicle models from 3 manufacturers: Mercedes-Benz, Volkswagen, Volvo.
Sources (12)
- articleNHTSA Part 573 Safety Recall Report 24V-372 - battery management system software
- ForumMercedes BMS Recall for EQS/EQE - MBWorld.org Forums
- articleMercedes-Benz Recalls EQE, EQS, EQS SUV EVs For Faulty Software - InsideEVs
- ForumBattery Management System recall — MBWorld.org EQE (V295) Sedan forum
- articleMercedes-Benz Recalls EQE and EQS for Battery Management System Software Issue
- RecallNHTSA Recall 21V109000 — 2021 Volvo XC40
- ForumT-Cross Forum (UK) — Error: Start/Stop System
- articleAUTODOC — VW T-Cross common problems and faults (Start/Stop & battery)
- articleMercedes recalls nearly 15,000 EVs for software issue (Green Car Reports)
- ForumGLB 48-V Battery Service Campaign 10-31-25 - MBWorld.org GLB Class (X247) forum
- ForumAuxiliary battery - MBWorld.org GLB Class (X247) forum
- ForumBATTERY - MBWorld.org GLB Class (X247) forum
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.