2017 6.6

Waaazooo · October 10, 2017

Any ideas of common reasons why a new truck has a CEL? Cruising on the freeway and CEL came on. I checked the fuel cap. Any ideas?

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jhplak325 · October 10, 2017

Going to need the code read to see what the problem is.

In the meantime, head over to Duramax.com forum for others with CEL with less miles than you have on 2017’s - http://www.duramaxforum.com/forum/2017-l5p-duramax-powertrain/

Waaazooo · October 10, 2017

That was depressing. Ugh

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grizzlyltz · October 10, 2017

Most likely emission crap.

Had a LML and never again will I own a newer diesel.

I had no choice and deleted

But I couldn't stand the smell in the winter so I traded it in on a 6.0 and I haven't looked back.

But I do miss the sound and the torque

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Waaazooo · October 13, 2017

Nox sensor low voltage. Recalibrated something and sent me on my way.

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redwngr · November 17, 2017

Waaazooo,

you probably already know this, but there is now a (Nov 1 announced) programming recall for the L5P. Deals with an emission sensor issue and also TCM changes. Hopefully this will stop all the mystery cel issues that some are having with the L5P.

Waaazooo · November 17, 2017

Waaazooo,
you probably already know this, but there is now a (Nov 1 announced) programming recall for the L5P. Deals with an emission sensor issue and also TCM changes. Hopefully this will stop all the mystery cel issues that some are having with the L5P.

Funny thing. I took it in to have the alignment done and they mentioned they did a recall that was due on the truck. I wonder if that was it.

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redwngr · November 17, 2017

It likely was primarily the emissions sensor programming thing. Seems like they all need it unless built just before the Nov 1 2017 announcement.

Some have reported the TCM changes have improved drivability.

Mine was built late enough it didn't need the updates, so I don't have an opinion on any drivability impact.

Waaazooo · November 17, 2017

How do you find out the born on date for your truck?

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redwngr · November 17, 2017

1 hour ago, Waaazooo said:

How do you find out the born on date for your truck?

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Easiest is likely to get dealer or gm chat to run VIN and check for you.

You can check recall status yourself with the myGMC (or chev version) onstar app. (it's no the vehicle status page)

(and likely through the 'Owner Centre' on the GMdivision websites)

EDIT to add: If you get the Onstar ~~maintenance~~ diagnostic reports there is a link there to check recall status as well.

Copy the VIN from the report, then click the link, then paste in the VIN...

powerhaulic · November 18, 2017

production date is in the door jamb as well

Recall for programming does come up on MY GMC app as well

My L5P was built early Oct, Had 1900mi on it this week when check eng. light came on.

Recall was done wednesday, driveability is improved and shifts are improved.

Looking forward to many enjoyable miles from this truck

redwngr · November 18, 2017

Just the month/year on the label on doorjam isn't it?

powerhaulic · November 18, 2017

9 hours ago, redwngr said:

Just the month/year on the label on doorjam isn't it?

Correct

Cowpie · November 20, 2017

The myriads of sensors on a modern diesel engine is staggering. It has been well stated.... the more complicated the plumbing, the easier it is to stop up the drain.

SMiller · November 23, 2017

On 10/9/2017 at 9:28 PM, grizzlyltz said:

Most likely emission crap.

Had a LML and never again will I own a newer diesel.

I had no choice and deleted

But I couldn't stand the smell in the winter so I traded it in on a 6.0 and I haven't looked back.

But I do miss the sound and the torque

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I drive diesel trucks at work all day, nasty ass regens, smoke, fumes, shitty mileage.

Hop in my gas truck, no noise, no smell, no issues.

Love the L5P but at some point the manufacturers have to figure out a solution, the EPA has them jumping through hoops and they don't even have time to figure it out.