U0029
Vehicle Communication Bus B Performance
2002-2009 GMC Envoy 4.2L I6 🇨🇦
Moderate SeverityNetwork
Description
CAN bus B performance is degraded with intermittent communication issues.
Symptoms
- Secondary systems intermittent
- Body control functions erratic
- Climate control glitches
Common Causes
- Wiring degradation on bus B
- Module fault on bus B
- Poor splice connections
- Aftermarket device loading bus
Diagnostic Steps
- Scope bus B signals
- Check bus B termination
- Inspect bus B wiring
- Isolate modules on bus B
Repair Notes
Diagnose bus B wiring and termination. Check for aftermarket device interference.
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
U0029 on Other Vehicles
Common Questions
What does code U0029 mean on a 2002-2009 GMC Envoy?
U0029 stands for "Vehicle Communication Bus B Performance". CAN bus B performance is degraded with intermittent communication issues.
What are the symptoms of U0029 on a GMC Envoy?
Common symptoms of U0029 include: Secondary systems intermittent, Body control functions erratic, Climate control glitches.
What causes U0029 on a 2002-2009 GMC Envoy?
Common causes of U0029 include: Wiring degradation on bus B, Module fault on bus B, Poor splice connections, Aftermarket device loading bus.