U0111: Lost Communication With Battery Energy Control Module A
What Does U0111 Mean?
U0111 is a diagnostic trouble code indicating: Lost Communication With Battery Energy Control Module A. This code relates to the network communication system. It has been reported in NHTSA complaints across 4 different vehicle models.
Common Causes
- 🔍 Wiring or connector problem
- 🔍 Sensor or control module malfunction
U0111 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"DRIVING ON SB HWY 35 AT 74MPH, MASTER WARNING LIGHT CAME ON AND VEHICLE SHUT DOWN, NO ELECTRICAL OR ENGINE CONTROL. PULLED SAFELY TO SHOULDER OF ROAD. CAR WOULD NOT RESTART. GOT OUT OF CAR, LOCKED CAR, UNLOCKED CAR (TOYOTA TECHNICIAN INSTRUCTIONS), THEN CAR RESTARTED. GOT CAR OFF THE ROAD, CONTA"
— Toyota Prius owner, 10/14/2014
"Driving down highway at highway speed and car shot 52 failure codes. Car lost power and crawled to side of road. Nearly got rear ended multiple times trying to remove vehicle from roadway. Engine permanent codes U0111 U012D U0110 U12A5 U1206 U1205 Anti lock brakes permanent codes U040168 CAN "
— Honda Insight owner, 12/09/2022
"While driving around [XXX] PM on Thursday, [XXX], the Focus Electric displayed a "Stop Safely Now" message and proceeded to cut power going to the electric motor, allowing the car only to coast as if it was in neutral. Luckily no vehicles were around in my lanes, as that easily could've caused an ac"
— Ford Focus owner, 04/18/2024
Source: NHTSA Complaints Database
Most Reported Vehicles for U0111
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA PRIUS | |
| 2 | HONDA INSIGHT | |
| 3 | FORD FOCUS | |
| 4 | JEEP WAGONEER |
U0111 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
-
1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
-
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
-
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.