One problem related to transmission not engage has been reported for the 2006 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Altima based on all problems reported for the 2006 Altima.
2006 Nissan Altima ser. When driving the clutch sinks. Several pumps will get it back in order. Also at times on a cold start it doesn't feel like the clutch disengages completely.