Vehicle Communication Bus B Performance
2007-2012 Nissan Altima 2.5L I4
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
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0029 on Other Vehicles
Nissan 200SX
1995-1998 1.6L I4 GA16DE
Nissan 200SX SE-R
1995-1998 2.0L I4 SR20DE
Nissan 240SX
1995-1998 2.4L I4 KA24DE
Nissan 300ZX
1990-1996 3.0L V6 VG30DE
Nissan 300ZX Twin Turbo
1990-1996 3.0L Twin-Turbo V6 VG30DETT
Nissan 350Z
2003-2006 3.5L V6 VQ35DE
Nissan 350Z
2007-2009 3.5L V6 VQ35HR
Nissan 370Z
2009-2020 3.7L V6 VQ37VHR
Common Questions
What does code U0029 mean on a 2007-2012 Nissan Altima?
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 Nissan Altima?
Common symptoms of U0029 include: Secondary systems intermittent, Body control functions erratic, Climate control glitches.
What causes U0029 on a 2007-2012 Nissan Altima?
Common causes of U0029 include: Wiring degradation on bus B, Module fault on bus B, Poor splice connections, Aftermarket device loading bus.