I have a 2004 crew cab 4x4 truck I just bought it wont run after it was parked inside. I havent used it much as still havent sold the 03. This one has 88,000K or 55,000 miles. I left it low on fuel the light wasnt on but it was nearly empty on guage. I want to install a webasto heater and need to pull tank for that. Anyway I primed the fuel filter and it started so I added a few gallons for safety margin and moved it outside. It doesnt start now no matter what. I have a snap on scan tool I just put on and it says U1800 lost comm with fuel injection module. Has anyone one across this? All fuses are good but no run. Here is hoping engine warranty covers it as didnt want repair costs yet. Any help is appreciated.