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Home/DTC Codes/Pontiac/Sunfire/1995-2005 2.2L I4/U0029
U0029

Vehicle Communication Bus B Performance

1995-2005 Pontiac Sunfire 2.2L I4

Moderate SeverityNetworkGeneric (SAE)

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

  1. Scope bus B signals
  2. Check bus B termination
  3. Inspect bus B wiring
  4. Isolate modules on bus B

Repair Notes

Diagnose bus B wiring and termination. Check for aftermarket device interference.

Related Codes

U0010Medium Speed CAN Communication BusU0028Vehicle Communication Bus A Performance

Other Network Codes

U0029 on Other Vehicles

Pontiac Aztek

2001-2005 3.4L V6

Pontiac Bonneville

1990-1999 3.8L V6

Pontiac Bonneville

2000-2005 3.8L V6

Pontiac Bonneville GXP

2000-2005 4.6L V8

Pontiac Bonneville GXP

2000-2005 4.6L V8 Northstar

Pontiac Bonneville SSEi

1992-1999 3.8L Supercharged V6

Pontiac Bonneville SSEi

1992-1999 3.8L V6 Supercharged

Pontiac Firebird

1993-1997 3.4L V6

Common Questions

What does code U0029 mean on a 1995-2005 Pontiac Sunfire?

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 Pontiac Sunfire?

Common symptoms of U0029 include: Secondary systems intermittent, Body control functions erratic, Climate control glitches.

What causes U0029 on a 1995-2005 Pontiac Sunfire?

Common causes of U0029 include: Wiring degradation on bus B, Module fault on bus B, Poor splice connections, Aftermarket device loading bus.

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