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Home/DTC Codes/Pontiac/Sunfire/1995-2005 2.2L I4/U0046
U0046

Vehicle Communication Bus B Off

1995-2005 Pontiac Sunfire 2.2L I4

High SeverityNetworkGeneric (SAE)

Description

CAN bus B is completely offline. No communication on the secondary CAN bus.

Symptoms

  • Secondary systems inoperative
  • Body control functions down
  • Climate control offline
  • Entertainment system not communicating

Common Causes

  • CAN bus B wiring shorted or open
  • Bus B termination resistor failure
  • Module pulling down bus B
  • Major connector failure

Diagnostic Steps

  1. Measure bus B resistance
  2. Check bus B voltage levels
  3. Isolate bus B segments
  4. Inspect bus B connectors

Repair Notes

Complete bus B failure requires systematic wiring diagnosis.

Related Codes

U0010Medium Speed CAN Communication BusU0073Control Module Communication Bus A Off

Other Network Codes

U0046 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 U0046 mean on a 1995-2005 Pontiac Sunfire?

U0046 stands for "Vehicle Communication Bus B Off". CAN bus B is completely offline. No communication on the secondary CAN bus.

What are the symptoms of U0046 on a Pontiac Sunfire?

Common symptoms of U0046 include: Secondary systems inoperative, Body control functions down, Climate control offline, Entertainment system not communicating.

What causes U0046 on a 1995-2005 Pontiac Sunfire?

Common causes of U0046 include: CAN bus B wiring shorted or open, Bus B termination resistor failure, Module pulling down bus B, Major connector failure.

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