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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 08-30-2017, 12:27 PM   #1 (permalink)
mastercraftka
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2011 LML multiple codes

I have a 2011 LML been deleted almost one year now. I got a check engine light this week had it scanned.

C0899
P0675
P0128

P0675 I have read that it is the #5 glow plug seems straight forward.


C0899 I can't find anything?

P0128 says the thermostat? IF so replace? where is it on the lml?

thanks,

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Old 08-30-2017, 02:17 PM   #2 (permalink)
mastercraftka
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went and checked the TCM wires jiggled them. Also checked voltage on the batterys which was 12 volts then I checked the alternator and batteries while it was running go 14 volts at the batteries and the alternator.

checked codes again all i got was the p0675 code. I cleared them and ran it for a bit nothing back on yet.

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Old 08-30-2017, 02:27 PM   #3 (permalink)
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I found this for the C0899

Quote:
Those are all low voltage codes stored in your vehicle. Has the battery gone dead recently? Have you replaced the battery or alternator recently?

Usually these codes set as a result of an electrical issue, usually a battery problem. If you haven't done any repairs, I would suggest to start by checking the starting and charging system on the Yukon. You may need a new battery and that can fix all those codes.
Being a 2011 you are at 6 years on the batteries. I think that might be your trouble spot. I bet a low battery at start could also throw a glow plug code. Have you had the batteries load tested? How long did it sit before you started it and received the codes?
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Old 08-30-2017, 02:33 PM   #4 (permalink)
mastercraftka
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Nothing done to it, the batteries are only about 2 years old at the most. The starter does drag a bit always has. I guess there could be an issue with one or both even though they show to have 12 volts.
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Old 08-30-2017, 02:36 PM   #5 (permalink)
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A completely smoked battery can show 12V. You need to have them load tested. And as I'm sure you know, always replace batteries in pairs.
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Old 08-30-2017, 02:47 PM   #6 (permalink)
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Ya will get them load tested for sure. And ya i know about doing it in pairs hope they are bad like i said only 2 years old maybe less.
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Old 08-30-2017, 08:54 PM   #7 (permalink)
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https://www.dieselplace.com/forum/63-...074-p0128.html
DTC P0128 is designed to detect for a stuck open thermostat.

Last edited by G2GBY; 08-30-2017 at 09:20 PM.
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Old 08-30-2017, 09:01 PM   #8 (permalink)
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Your Thermostates (338) (340)
In DIY there's how to change Thermostates
There's also YouTube vidios that are very helpful.

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Old 08-30-2017, 09:33 PM   #9 (permalink)
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C0899
http://repairdata.cnlaunch.com/pdf/2...c7d469e48a.pdf

Last edited by G2GBY; 08-30-2017 at 09:34 PM.
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Old 08-31-2017, 09:56 AM   #10 (permalink)
mastercraftka
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Still no codes yet. can you have a code and no check engine light?

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