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I have a 2009 Duramax LML with approximately 185k miles that is all stock. I was driving on the interstate last weekend about three hours into a five hour drive. Cruise was set on 78 running about 2000 rpm. It was level ground with minimal boost involved. Out of nowhere, it felt like the truck lost power and had a noise similar to a belt or the transmission slipping. The truck slowed itself down and it felt like I was applying the brakes even though I wasn't. I pulled off the interstate onto the shoulder and before I came to a complete stop, the noise went away. Checked the belt, etc. and couldn't find anything. All gauges read normal and the transmission temp was around 180 which is normal cruise temp for the truck. Being in the middle of nowhere, I got back on the interstate and the truck was driving fine. About 30 miles later, it did the same exact thing. I once again pulled off the interstate to look and couldn't find anything. I drove another 100 miles or so to my destination without a problem. Two days later, about the same distance into the drive home, my truck did the same thing once, went away, and has driven fine since. I checked all fluids, etc. and everything looks good. Has anyone dealt with this before. I can't get it into the dealership until after the 4th of July weekend and am supposed to haul horses on an eight hour round trip. Thank you for any input.
 

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I have a 2009 Duramax LML with approximately 185k miles that is all stock. I was driving on the interstate last weekend about three hours into a five hour drive. Cruise was set on 78 running about 2000 rpm. It was level ground with minimal boost involved. Out of nowhere, it felt like the truck lost power and had a noise similar to a belt or the transmission slipping. The truck slowed itself down and it felt like I was applying the brakes even though I wasn't. I pulled off the interstate onto the shoulder and before I came to a complete stop, the noise went away. Checked the belt, etc. and couldn't find anything. All gauges read normal and the transmission temp was around 180 which is normal cruise temp for the truck. Being in the middle of nowhere, I got back on the interstate and the truck was driving fine. About 30 miles later, it did the same exact thing. I once again pulled off the interstate to look and couldn't find anything. I drove another 100 miles or so to my destination without a problem. Two days later, about the same distance into the drive home, my truck did the same thing once, went away, and has driven fine since. I checked all fluids, etc. and everything looks good. Has anyone dealt with this before. I can't get it into the dealership until after the 4th of July weekend and am supposed to haul horses on an eight hour round trip. Thank you for any input.


i dont think it would be the actual belt slipping, that should not have any impact on the power output of the truck, the belt only runs that AC, power steering, brakes, alternator and fan. Do you have any codes? also, do you have a scanner that can read fuel rail pressure and the like?
 

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The truck does not show a CEL. When I plugged it into a snap-on Solus code reader yesterday, it did not show any stored codes. From the scanner, rail pressure, etc. at idle are within normal range.
 

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The truck does not show a CEL. When I plugged it into a snap-on Solus code reader yesterday, it did not show any stored codes. From the scanner, rail pressure, etc. at idle are within normal range.
Id plug the solus in and take it on the highway and see if you notice anything there, my first guess would be a fuel delivery issue, be that a restriction in the lines, weak pump or an issue with the filter / head, dunno. The solus should be able to data log the whole event, its been a while since ive used mine but ive data logged some pretty long drives before.

How long did you let the truck sit each time you pulled over? would it be long enough for the fuel and lines to cool down? maybe you have a fuel line that's collapsing under vacuum as the fuel temperature rises.
 
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