For Shop Owners

U1000 NISSAN - CAN Communication Line - Signal Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Controller Area Network (CAN) communication harness is open or shorted
  • Faulty Engine Control Module (ECM)
  • Poor harness ground connection.
What does this mean?

Tech notes

Usually, the problem is poor harness ground connection.

There is a service bulletin for the following Nissan models with U1000 code:
- 2002-2006 Nissan Maxima
- 2004-2006 Nissan Titan
- 2004-2006 Nissan Armada
- 2002-2006 Nissan Sentra
- 2005-2006 Nissan Frontier
- 2002-2006 Nissan Altima
- 2005-2006 Nissan Xterra
- 2005-2006 Nissan Pathfinder
- 2004-2006 Nissan Quest
- 2003-2006 Nissan 350Z
- 2003-2006 Nissan Murano
Nissan Factory Service Bulletin Code U1000

Service bulletin suggests cleaning engine and body harness ground connection to repair the problem.
- Clean/re-tighten ECM ground connections.
- Clean/re-tighten negative battery cable body connection and battery post connection.
- If needed, clean and ensure good contact between the steering member assembly and the left side instrument stay assembly.
What does this mean?