One problem related to diesel engine has been reported for the 2004 Nissan Titan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Nissan Titan based on all problems reported for the 2004 Titan.
1-knocking sound, sounds like a diesel engine. 2-body & steering wheel vibration at idle. 3-hissing sound when heat or ac is on. 4-rotors replaced 3 times. Still having some problem. 5-when idle in gear (idle drops below 500 steering start to vibrate. 6-vibration on brake pedal. 7-emergency brake not holding when in park.