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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-03-2018, 12:15 AM   #1 (permalink)
coug60
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P2495 Code

2011 2500HD 104k miles

Just picked up a hard P2495 code.

Can someone fill me in on this?

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Old 02-03-2018, 09:56 AM   #2 (permalink)
G2GBY
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P2495 EGR cooler bypass bank 1 high circuit.

One persons fix was.
"Found a loose plug on the EGR Cooler bypass plug (P2495 which is on the passanger side by the firewall next to the coolant overflow) cleared codes and that one stayed gone"

If it was my truck I would take care of it like Kennedy's suggested.
https://www.dieselplace.com/forum/63-...placement.html


Last edited by G2GBY; 02-03-2018 at 10:07 AM.
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Old 02-03-2018, 11:10 AM   #3 (permalink)
coug60
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Thanks, Ill look into that.
I keep this truck in perfect condition. I could understand it maybe if I had close to 200k on it but...

I wonder if its the cooler itself, or if there is other components with it that are more probable cause to this fault..
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Old 02-08-2018, 11:47 PM   #4 (permalink)
coug60
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Well took the truck to the dealership to have them checkout a P2495, P140A, P245 and they told me my EGR Cooler Bypass Valve was bad. I suspected it was the valve but was hoping I was wrong and they would find something simple that was causing the faults. They said it was going to be $3100 to fix. So, said hell no and picked the truck up and was about to do it myself. I’m pretty good at working on the top half of a Duramx.
I did some research and found a new OE valve for $296 and for the hell of it checked a reputable diesel repair shop I know and they said they could do the R&R for $1200. So, in order to save some knuckle skin took the truck in, dropped it off and the guys told me it would be ready the next day.

Then Murphy showed up…

Got a call and was told that when they took the resonator off, out of it came a bunch of metal filings and a small beat-up sheet metal screw. They then put a video scope down to the Turbo and the impeller was chewed up ugly (saw the pictures) and the nut on the front center of the impeller was half gone. I didn’t think I had a bad EGR Cooler Bypass Valve anymore.
So now it’s going to cost me about $3300 to put in a new turbo, replace the EGR Cooler Bypass Valve anyway just in case (add $296 for that), and remove and clean out the intercooler. Pretty good price if you ask me and that includes the turbo, all the gaskets and painting my turbo, crossover pipe, intake bridge, red with high heat 2k degree engine paint. Probably would have been twice that at least with the dealership.

Somehow, I think my dealership had something to do with this since I haven’t done any maintenance on my own truck and always took it to the dealership for required maintenance. Not going there anymore….
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Old 02-09-2018, 10:06 AM   #5 (permalink)
G2GBY
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I would do an oil Annalise just to make sure any shrapnel make its way into the engine. Normally an intercooler is often becomes the catchall for compressor wheel fragments but you never know.

Last edited by G2GBY; 02-09-2018 at 10:07 AM.
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