U112100: Communication Fault (Extended Manufacturer Specific)
2 vehicles · 1 makes
Most Reported On
U112100 is an OBD-II diagnostic trouble code meaning “Communication Fault (Extended Manufacturer Specific).” Extended manufacturer-specific network communication fault code. This code is most commonly reported on 2019-2023 Audi e-tron (e-tron quattro (2019, 2021-2023); e-tron Sportback quattro (2020-2023); e-tron S (2022-2023); excludes Q8 e-tron), and 2020-2024 Audi S8 (Vehicles with adaptive air suspension; confirm DTC and symptom code before parts).
Common Causes
Diagnostic Tools
To diagnose U112100, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (2)
2019-2023 e-tron Air-Suspension Warning with J1135 Communication Fault - Diagnosis Required
2020-2024 S8 Air-Suspension Malfunction with J1135 Communication Fault - Diagnosis Required
2021 e-tron Charging Interruptions with Onboard-Charger Software 0070 - Diagnosis Required
FAQ
What does U112100 mean?
U112100 stands for "Communication Fault (Extended Manufacturer Specific)." Extended manufacturer-specific network communication fault code.
What are the most common causes of U112100?
The most common causes of U112100 are: Module communication error, CAN bus issue, Software incompatibility, Wiring fault, Module requiring update. The specific cause varies by vehicle.
How much does it cost to fix U112100?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U112100?
Au7o has documented U112100 across 2 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.