U2100 on 2020-2023 Lincoln Aviator — CAN Bus Communication (Manufacturer-Specific)
1 vehicles · 1 makes
Most Reported On
U2100 is an OBD-II diagnostic trouble code meaning “CAN Bus Communication (Manufacturer-Specific).” U2100 is a manufacturer-specific code indicating a Controller Area Network (CAN) bus communication problem, often meaning one or more modules has gone into a 'bus-off' condition or initial network configuration was not completed. The vehicle's modules talk to each other over the CAN bus, and this code sets when that communication is disrupted. The effect ranges from warning lights to disabled features depending on which modules dropped off. This code is most commonly reported on 2020-2023 Lincoln Aviator.
Common Causes
Diagnostic Tools
To diagnose U2100, 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
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FAQ
What does U2100 mean?
U2100 stands for "CAN Bus Communication (Manufacturer-Specific)." U2100 is a manufacturer-specific code indicating a Controller Area Network (CAN) bus communication problem, often meaning one or more modules has gone into a 'bus-off' condition or initial network configuration was not completed. The vehicle's modules talk to each other over the CAN bus, and this code sets when that communication is disrupted. The effect ranges from warning lights to disabled features depending on which modules dropped off.
What are the most common causes of U2100?
The most common causes of U2100 are: Damaged CAN bus wiring (short, open, chafe), Loose or corroded connector at a module (e.g., transmission harness), Faulty control module causing bus-off, Poor or high-resistance ground, Low or unstable battery voltage, Module not configured/programmed correctly after replacement, Water intrusion / corrosion at connectors. The specific cause varies by vehicle.
How much does it cost to fix U2100?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U2100?
Au7o has documented U2100 across 1 vehicle models from 1 manufacturers: Lincoln.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.