Possible causes
– Controller Area Network (CAN) communication harness is open or shorted
– Faulty Engine Control Module (ECM)
– Poor harness ground connection.
– Faulty Engine Control Module (ECM)
– Poor harness ground connection.
Tech description
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
The service bulletin suggest cleaning engine and body harness ground connection to repair problem.
When is the obd code mean?
When ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) for 2 seconds or more.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
U1000 NISSAN OBD Code Description