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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 09-16-2019, 12:52 PM   #1 (permalink)
sellsted69
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2011 LML stalling issue

New hire at fleet shop, was given this issue to try and rectify. 2011 LML with 287,000 km on it. Randomly stalls when driving. Small shop, jobber, says crank sensor gives erratic readings when running. They suspect crank bearings are worn out, which causes harmonic vibrations in crank and creates the erratic readings, which eventually causes stalling. They say they have seen this in one other vehicle, cant find any other online info to corroborate the story. Shop says engine oil smells burnt, which they say is an indication of bearing issues. My nose isnt great, cant verify, even by other people.
Have seen all sorts of random issues with stalling problems, but nothing to really deal with this engine, mostly older duramax's.

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2011 LML with 287,000 km

Last edited by OkDually; 09-16-2019 at 01:11 PM. Reason: sig
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Old 09-17-2019, 10:29 AM   #2 (permalink)
Rat Infested
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Did you check the harness that runs behind the A/C compressor on top of the engine? They rub on the A/C hard line and cause issues like you're stating.

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Old 09-17-2019, 11:11 AM   #3 (permalink)
Rvn4me
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Any codes? 2001-2010 Have a Crankshaft Position Sensor (also called Knock Sensor) 97365037
SENSOR, CRANKSHAFT POSITION
2011 and new don’t have this sensor.

Last edited by Rvn4me; 09-17-2019 at 11:14 AM.
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Old 09-17-2019, 05:40 PM   #4 (permalink)
sellsted69
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Quote:
Originally Posted by Rat Infested View Post
Did you check the harness that runs behind the A/C compressor on top of the engine? They rub on the A/C hard line and cause issues like you're stating.
I had noticed this issue with an earlier engine, had a look at mine, but could not see an issue at that time. I will check closer now that I have a better idea of were to look.
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Old 09-17-2019, 05:43 PM   #5 (permalink)
sellsted69
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Quote:
Originally Posted by Rvn4me View Post
Any codes? 2001-2010 Have a Crankshaft Position Sensor (also called Knock Sensor) 97365037
SENSOR, CRANKSHAFT POSITION
2011 and new donít have this sensor.

What year did they incorporate the crank sensor and knock sensor? Every other engine that I know of has them seperate. As for codes, there is a check engine light, last mechanic had his own code reader, so he took it with him when he left. I will check when I remember to bring my own from home.
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Old Today, 08:11 AM   #6 (permalink)
Rvn4me
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Quote:
Originally Posted by sellsted69 View Post
What year did they incorporate the crank sensor and knock sensor? Every other engine that I know of has them seperate. As for codes, there is a check engine light, last mechanic had his own code reader, so he took it with him when he left. I will check when I remember to bring my own from home.
Go to your favorite parts store to have codes read and report back.
Your code will tell you exactly what’s going on otherwise it’s just a guessing game.
These codes below are for 2001-2010
There doesn’t seem there’s a (CKP or (CMP) on the LML. I don’t know where the get there readings from or if not needed. Parts diagrams don’t show a (CKP) or CMP) for the LML

2001-2010
The ECM uses Crankshaft Position (CKP) Sensor and the Camshaft Position (CMP) Sensor information for:
- Start-up
-Engine speed
-Engine stroke
If the CKP Sensor signal is lost at any time, the engine will not run.
-DTC P0335 sets if there is no signal from the CKP sensor.
-DTC P0336 sets if the CKP sensor signal is out of range.
If the CMP Sensor signal is lost while the engine is running, the engine will operate normally.
-If the CMP Sensor signal is not present at start-up, the engine will not start.
-DTC P0340 will set if there is no signal from the CMP.
-DTC P0341 sets if the CMP signal is out of range.

Last edited by Rvn4me; Today at 08:31 AM.
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