03 6.0 I use it for a every other day truck. I dont hardly ever pull loads with it, but do drive it hard. It wouldnt start this morning temp was around 35-40 %. When I got home this evening it still wouldnt hit. It was cranking over good, but I did run the batteries down after a while. I put it on charge and plugged in the block heater. I drained the water trap, it was clean. After sitting plugged in for about 30 min. it started right up. It started throwing codes for ICP sensor circuit low, but its not leaking any oil. Would the sensor make it not cold start or do I have another problem? I not real sure about the sensor most things I read say when they go bad they leak oil. Could it be a HPOP problem instead?

 

is that the only code?

 

Yes it had two codes but it was the same one.

 

Get a scanner that can test ICP desired VS. ICP actual, also test the FICM
Also it wouldnt leak oil cause of icp

 

Update I left the truck plugged up last night. It started right up this morning. I'm going to change icp sensor this weekend. Is there anything I can do to help the cold start problem? I also forgot to mention the truck has 77,000 miles and is all stock. Was planning to do a egr delete this winter and coolant filter.

 

That time of the year again when we start hearing more and more about hard starting in the cold.

First things first, good batteries go a long way. I would take both batteries in to an auto parts store and have them load tested. If one is bad, replace both. I just did this with my 06. Napa had some of the highest CCA batteries I could find, they were 880CCA each.

Second, test your FICM.

When you were cranking the truck over, were you getting any smoke out the exhaust?

With a weak or dying FICM, plugging it in will make it start tremendously easier. 35-40 degrees is hardly cold enough to stop a 6.0 from starting, IF it has good batteries and a good FICM, those two things will do wonders on a 6.0. There is a FICM test procedure at the top of the 6.0 page, it takes 15 minutes with a buddy, a multi-meter, an 8mm socket, and a T-20 torx bit on a socket. That 15 minutes includes drinking two beers.