2004 turbo 6.0 diesel 30, 000 miles lots of after market chip, exhaust, air filter etc. (not mine so not sure what else). check engine light entermintent. with trouble code T2285 Injector Control Pressure is Low. No apparent run problems. any ideas what to check? I Believe it is still under warranty but thats 100$ min to find out if it is covered. I personaly like to know before i take it it in thanks for any help.