U1041moderate severityNetwork
Communication Bus Initialization Failure
on 2015 Kia Forte 1.8L I4 · FWD
What this code means
The communication bus failed to initialize properly during vehicle startup.
Symptoms
- Systems slow to come online
- Extended crank before modules respond
- Features not available immediately after start
- Delayed warning light checks
Common causes
- Module power-up sequence issue
- Bus termination problem
- Module not completing initialization
- Power supply slow to stabilize
- Gateway module slow to boot
Diagnostic steps
- Check power supply voltage during cranking
- Monitor bus initialization with scope
- Check gateway module boot sequence
- Verify module power-up order
- Test battery and charging system
Repair notes
Check battery condition and power supply during cranking. Weak battery causes slow initialization.
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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