Possible causes
– Engine Control Module (ECM) may be faulty
– ECM harness power supply circuit is open or shorted
– ECM harness ground circuit is open or shorted
– ECM harness power supply circuit is open or shorted
– ECM harness ground circuit is open or shorted
Tech description
Try erasing the code first, if the light comes back ON you may have to replaced the ECM to repair the problem.
There is a factory service bulletin for the following Nissan models:
2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2002-2005 Nissan Altima Service Bulletin OBDII Code P0605
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Engine may not start
– Engine may not start
P0605 NISSAN OBD Code Description