Lost Communication with ECM/PCM
2014-2014 Lincoln MKX 3.7L V6
The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed u0100 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The diagnostic system cannot communicate with the Engine Control Module.
Symptoms
- Multiple warning lights
- Engine may not start
- Many systems inoperative
- Cannot read engine codes
Common Causes
- PCM power or ground failure
- CAN bus wiring issue
- PCM failure
- Fuse blown
- Wiring harness damage
Diagnostic Steps
- Check PCM fuses
- Test PCM power and ground circuits
- Check CAN bus wiring to PCM
- Try communicating with other modules
- Inspect wiring harness
Repair Notes
Check fuses and power supply to PCM first. CAN bus issue is second most common.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0005High Speed CAN Communication Bus (+) High
U0100 on Other Vehicles
Lincoln Aviator
2003-2003 4.6L V8 DOHC
Lincoln Aviator
2004-2004 4.6L V8 DOHC
Lincoln Aviator
2005-2005 4.6L V8 DOHC
Lincoln Aviator
2020-2020 3.0L Twin-Turbo V6
Lincoln Aviator
2020-2020 3.0L V6 Twin Turbo
Lincoln Aviator
2020-2020 3.0L V6 Twin Turbo Hybrid
Lincoln Aviator
2021-2021 3.0L Twin-Turbo V6
Lincoln Aviator
2021-2021 3.0L V6 Twin Turbo
Common Questions
What does code U0100 mean on a 2014-2014 Lincoln MKX?
U0100 stands for "Lost Communication with ECM/PCM". The diagnostic system cannot communicate with the Engine Control Module.
What are the symptoms of U0100 on a Lincoln MKX?
Common symptoms of U0100 include: Multiple warning lights, Engine may not start, Many systems inoperative, Cannot read engine codes.
What causes U0100 on a 2014-2014 Lincoln MKX?
Common causes of U0100 include: PCM power or ground failure, CAN bus wiring issue, PCM failure, Fuse blown, Wiring harness damage.
Last updated: March 2026