Lately, my truck has been cutting off while I'm sitting in traffic. A few times it has cut off while I'm cruising at @ 45 mph. I have no idea what the problem is. Today it has already cut off twice, and the second time the SES light came on. I pulled out my Hellion to read the codes and I had 3: P1299 - Cylinder Head Overtemperature Protection Active; P0102 - MAF Circuit Low Input; & P0451 - Evap Emission Control System Pressure Sensor Performance. What the hell do these mean?? The truck "feels" like it is running flawlessly. I have noticed a "hissing" sound coming from what seems like the front of the KB. I'll try to get it on vid and post it up.

Any help/advise would be great.

Thanks
Tucker

 

The cyl head temp code sounds serious ..
As does the MAF circuit low input..

Both could spell serious trouble.

Cyl head temp should be the EXACT same as the coolant

BUT here is a scenario I dreamed up ... Your MAF is some how screwed up and it is reading the amount of air coming in as lower than it really is so you are running lean and that is also driving up the cylinder head temp...

As I understand it "P1299 - Cylinder Head Overtemperature Protection Active" is a last chance fail safe to keep the engine from melt down...

Doug