U2100moderate severityNetwork
Initial Setup Not Complete
on 2012 Toyota Tundra 5.7L V8 3UR-FE · 4WD
What this code means
The vehicle or module initial setup procedure has not been completed. Required after major module replacement.
Symptoms
- Multiple systems in limited mode
- Features not available
- Setup reminder messages
- Module self-tests not passed
Common causes
- Post-replacement setup not done
- Battery disconnect reset setup flags
- Module replacement without completing setup
- Programming interrupted during setup
Diagnostic steps
- Run complete vehicle setup procedure
- Perform module initialization sequence
- Complete all post-replacement steps per service manual
- Verify each system completes self-test
Repair notes
Complete the full post-service initialization procedure per manufacturer service manual.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus