Lost Communication with Starter/Generator Module
2011-2015 Ford Explorer 3.5L V6
Description
Cannot communicate with the integrated starter-generator in start-stop or mild hybrid vehicles.
Symptoms
- Start-stop system disabled
- Engine will not auto-restart
- Mild hybrid assist not available
- Warning message displayed
Common Causes
- Starter-generator module failure
- CAN bus wiring
- Module power loss
- Belt-driven starter-generator fault
Diagnostic Steps
- Check module fuse
- Test power and ground
- Check CAN wiring
- Test starter-generator operation
- Inspect drive belt condition
Repair Notes
Check power supply and belt condition on belt-driven starter-generators.
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
U0120 on Other Vehicles
Ford Bronco
2021-2024 2.3L I4 EcoBoost
Ford Bronco
2021-2024 2.7L V6 EcoBoost
Ford Bronco Raptor
2022-2024 3.0L V6 EcoBoost
Ford Bronco Sport
2021-2024 1.5L I3 EcoBoost
Ford Bronco Sport
2021-2024 2.0L I4 EcoBoost
Ford Crown Victoria
1998-2011 4.6L V8 Modular 2V
Ford E-150
1997-2014 4.6L V8 Triton
Ford E-150
1997-2014 5.4L V8 Triton
Common Questions
What does code U0120 mean on a 2011-2015 Ford Explorer?
U0120 stands for "Lost Communication with Starter/Generator Module". Cannot communicate with the integrated starter-generator in start-stop or mild hybrid vehicles.
What are the symptoms of U0120 on a Ford Explorer?
Common symptoms of U0120 include: Start-stop system disabled, Engine will not auto-restart, Mild hybrid assist not available, Warning message displayed.
What causes U0120 on a 2011-2015 Ford Explorer?
Common causes of U0120 include: Starter-generator module failure, CAN bus wiring, Module power loss, Belt-driven starter-generator fault.