U2100 on 2020-2023 Lincoln Aviator — CAN Bus Communication (Manufacturer-Specific)
1 vehicles · 1 makes
How to diagnose and fix U2100: most-reported vehicles
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Lincoln Aviator · 2020–2023
Some 2020-2023 Aviators equipped with air suspension may display a Drive Malfunction and/or Suspension Fault message with DTCs B1041 and U2100 stored in Suspension Control Module A (SUMA). Ford SSM 51621 says this bulletin-defined condition can occur when SUMA enters diagnostic service mode after an on-demand self-test following suspension diagnosis or repair. It does not identify a leaking air spring, compressor, height sensor, or solenoid as the cause of these two codes.
Common Symptoms
- Drive Malfunction message
- Suspension Fault message
- DTC B1041 stored in SUMA
- DTC U2100 stored in SUMA
How to Fix
Use Ford Diagnosis and Repair System (FDRS) and select SUMA > Run All CM (Continuous Memory) DTCs. Do not run SUMA > OD and CM DTCs for this condition because the on-demand self-test can create the invalid codes. If that test was run, clear the condition with SUMA > Transport and Factory Mode Deactivation. If other DTCs or physical ride-height symptoms remain, follow Workshop Manual Section 204-05 normal diagnostics before selecting a part.
Owner tips & cautions
- WarningDo not replace a compressor, air spring, sensor, or solenoid from B1041/U2100 alone; SSM 51621 first corrects a diagnostic service-mode state.
- TipAsk whether an on-demand SUMA self-test was run immediately before the warning appeared and retain the complete FDRS fault report for any remaining diagnosis.
Sources for this issue (1)
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U2100 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.