Three problems related to wiring have been reported for the 2008 Nissan Titan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Nissan Titan based on all problems reported for the 2008 Titan.
Pulling a trailer when the abs & slip lights came on, then the service engine soon light came on. After getting to the camp site I looked under the truck and found that the wiring harness had burned and melted fusing several wires together. This caused me to have no electric brake control to my trailer. Also some fire damage to the under frame and other parts of vehicle.
The Nissan Titan button on the shift lever that shifts manually, after manual shift is turned on, stopped working. This happened while I was pulling a trailer coming down from the mountains. This left my transmission in 4th gear and was not able to use the compression to help slow me down. I was able to get the truck back into normal automatic mode and I had to ride my breaks down the mountain to a flat area and swap vehicles to tow the trailer. After this incident I found that this issue is very common and is specifically caused by normal use of the vehicle. Meaning using the shift lever to pull the tuck out of park and back into park. This motion starts breaking the wiring on the controller. Nissan stated that there was nothing on record of this being a safety recall.
2008 Titan shift gear not responding, will not allow me to engage to lower gears (1-4). Stays on d only. The gear shifter button will not respond when the button is pressed. According to other Titan owners it appears to be a wiring harness as they have indicated the same problem, the wire breaks due to not enough slack in the wiring harness. Nissan service center stated that they will not honor the transmission warranty since I have 64000k miles on the vehicle.