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Home/DTC Codes/Nissan/Altima/2007-2012 2.5L I4/U0046
U0046

Vehicle Communication Bus B Off

2007-2012 Nissan Altima 2.5L 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

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 U0046 mean on a 2007-2012 Nissan Altima?

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 Nissan Altima?

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

What causes U0046 on a 2007-2012 Nissan Altima?

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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