U0044high severityNetwork
Control Module Communication Bus D Open
on 2006 GMC Canyon 3.5L I5 · 4WD
What this code means
There is an open circuit in bus D, breaking the communication path. Data cannot travel between the disconnected modules.
Symptoms
- Warning lights on dash
- Modules not communicating
- Loss of vehicle features
Common causes
- Broken bus D wire
- Disconnected connector
- Corroded terminals
- Failed control module
Diagnostic steps
- Scan all modules for codes
- Check bus D wiring for continuity
- Inspect connectors for damage
- Repair open and retest network
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Any of these will read and clear this code — pick by how deep you want to go.
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ANCEL AD410 →
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Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
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Autel MaxiCOM MK808S →
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Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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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