U0120moderate severityNetwork
Lost Communication with Starter/Generator Module
on 2011 Hyundai Tucson 2.0L I4 · AWD
What this code means
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.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0005
High Speed CAN Communication Bus (+) High