L5p problems - Chevy and GMC Duramax Diesel Forum
2017+ L5P Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 27 (permalink) Old 02-16-2017, 08:14 PM Thread Starter
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L5p problems

Starting a common thread for early problems. Please just leave a post of problem and resolution. This is just a thread for reporting problems not trying to resolve them.

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'15 Chevy ccsb wt wehrli | motorops | xd | nitto | atta | curt | tork lift | airlift | edge | s&b |
Bought 11/21/14 72 mi
01/01/16 177685
'03 cc lb drw bd intake, intake horn mod, dsp5, 4" silverline turbo back, d-celerator exhaust brake, amsoil bypass, amsoil synthetics throughout, 225/70 19.5, 1/3 drop, oil cooler
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post #2 of 27 (permalink) Old 02-17-2017, 09:57 AM
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post #3 of 27 (permalink) Old 02-17-2017, 11:06 PM
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Problem - They cost too much.
Solution - Didn't buy one.

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2015 CC/LB DRW 3500HD LML LTZ Blk/Blk #284 Stock for now ~ on the hunt for 19.5s.
2012 CC/SB 2500HD LML LTZ Blk/Blk PPEI tuned & deleted ~Traded~

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post #4 of 27 (permalink) Old 02-18-2017, 06:28 AM
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That was informational.....
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post #5 of 27 (permalink) Old 02-20-2017, 11:57 AM
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We just turn in our (3) Demos, putting 3-4k on each of them (they all 3 had 5K+ when we got them). I don't have the full report yet, but I do know they all performed decent.

1) LML 70mph+ vibration is still there (on one truck) (New wheels/tires/RFB/Driveshaft/Front Wheel bearings did nothing)
2) One truck had some transmission shifting issues towing 15k. TCM was replaced, issue corrected.

These are the only two items I'm aware of that came up on the negative side. The transmission shifting was corrected with a new TCM, but the LML 70+ vibration still remains unsolved.
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post #6 of 27 (permalink) Old 02-20-2017, 01:26 PM
 
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NOx sensors have been an issue on mine and at least one or two other peoples' trucks on here. So far, I've had the CEL come on twice now in 1200 miles for the NOx sensor. Just got the truck back from the dealer again today. Also, the first time the truck went in for the NOx sensor, they also replaced a seal on the rear differential, which was at about 850 miles.
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post #7 of 27 (permalink) Old 04-22-2017, 05:14 PM
 
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2017 gmc 3500 duramax 6.6 took off today and dash displayed reduced power the mil lighy came on and the engine stopped would not turn over turned key nothing after a couple of min. Would turn over no start
throwing p0087 code
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post #8 of 27 (permalink) Old 04-23-2017, 01:06 PM
 
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Ticking Noise

Is anyone else getting a ticking noise when the engine reaches operating temperature?
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Semper Et Deinceps
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post #9 of 27 (permalink) Old 04-23-2017, 01:55 PM Thread Starter
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Quote:
Originally Posted by WOODDUCK View Post
2017 gmc 3500 duramax 6.6 took off today and dash displayed reduced power the mil lighy came on and the engine stopped would not turn over turned key nothing after a couple of min. Would turn over no start
throwing p0087 code
Low frp. Mebob said there is a hpfp part change so I wonder if they're finding issues with the new fuel system

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'15 Chevy ccsb wt wehrli | motorops | xd | nitto | atta | curt | tork lift | airlift | edge | s&b |
Bought 11/21/14 72 mi
01/01/16 177685
'03 cc lb drw bd intake, intake horn mod, dsp5, 4" silverline turbo back, d-celerator exhaust brake, amsoil bypass, amsoil synthetics throughout, 225/70 19.5, 1/3 drop, oil cooler
Traded at 299,465
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post #10 of 27 (permalink) Old 04-23-2017, 04:23 PM
 
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Thanks for the reply.
Hopefully this will be the last time its on the flatbed,
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