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Old 10-23-2012, 10:44 PM   #1
Sureshot
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Default Duramax starting issue

My 05 2500HD with Duramax has an intermittent issue with starting or the starter "sensor". It cranks but kicks out like it thinks it started. It has done it off and on but in the last day or two has gotten worse and I would like to get it fixed. I am thinking they must have a sensor or something detecting ??? to keep from engaging the starter while running.

I made a short audio file of a few attempts then it starting.

https://dl.dropbox.com/u/56347875/Dmax%20Starting.m4a

Can't remember for sure but around 230k miles on it never touched.
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Old 10-24-2012, 12:28 AM   #2
atomicsaladbowl
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Default Re: Duramax starting issue

Can you possibly just bypass the sensor? I would imagine if you could figure out where it is and just bypassing it or replacing it wouldn't be that bad.

I have a chevy cavalier that has that sensor that won't allow the starter to engage while the car is running, but never owned anything else with that, or maybe I did, most vehicles I had were too loud to not be able to tell they were running haha!

I would think the sensor just went bad, or maybe there is a short to ground for the wiring that goes to this sensor? just a thought, good luck!
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Old 10-24-2012, 07:14 PM   #3
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Default Re: Duramax starting issue

I did a little google search and seems it may be the starter. It acted worse today and I thought I had pushed my luck too far. Spins with no engagement. Ever since new it has "ground" on engagement once in a blue moon but never enough to get me too concerned. If I can get through the next couple days I will have time to swap it out. I hate to drive my "nice" truck for work.
Sounds like some have had trouble with the reman starters as well. Anyone with experience?
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Old 10-24-2012, 07:54 PM   #4
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Default Re: Duramax starting issue

I know absolutely nothing about a diesel, but you have the classic symptoms of a failing starter "bendix" which is an overrun clutch on the end of the starter motor.
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Old 10-24-2012, 07:56 PM   #5
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Default Re: Duramax starting issue

Common problem. Replace the starter and be done with it. I've had a few duramaxs over the years, and remember doing starters on two of them.
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Old 10-24-2012, 08:07 PM   #6
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Default Re: Duramax starting issue

Quote:
Originally Posted by pop pop View Post
...you have the classic symptoms of a failing starter "bendix" which is an overrun clutch on the end of the starter motor.
^^^^
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Old 10-24-2012, 08:34 PM   #7
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Default Re: Duramax starting issue

Sound like the starter (not everything is because of a sensor). Have fun changing it though. Downpipe has to come off.
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Old 10-24-2012, 08:36 PM   #8
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Default Re: Duramax starting issue

I would get a acdelco and yes it doe suck cuz of downpipe.
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Old 10-24-2012, 08:49 PM   #9
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Default Re: Duramax starting issue

Quote:
Originally Posted by aussiek2000 View Post
Sound like the starter (not everything is because of a sensor). Have fun changing it though. Downpipe has to come off.
I am well aware. I was trying to get some input as to the sensor's role in why you can't engage the starter when the truck is running. The way the problem started and has been very intermittent but consistent in the cut out just as the truck would normally fire lead me to think other than the starter. The way it is acting today I think it is the starter.

I have had three Duramax trucks but never took one this far for mileage. It acted up with the grinding noise once in a blue moon since new so I guess it should be no surprise. As usual it is at a most busy time. I wonder if I show up at 8am and wine if I can get it in tomorrow ahead of everyone else.

Last edited by Sureshot; 10-24-2012 at 08:52 PM.
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Old 10-24-2012, 09:04 PM   #10
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Default Re: Duramax starting issue

Quote:
Originally Posted by aussiek2000 View Post
Sound like the starter (not everything is because of a sensor). Have fun changing it though. Downpipe has to come off.
You can finagle it in and leave the downpipe in place....well at least i have never pulled it off...
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Old 10-24-2012, 09:21 PM   #11
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Default Re: Duramax starting issue

is it cranking over fast enough ?
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Old 10-24-2012, 10:39 PM   #12
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Default Re: Duramax starting issue

There is no "starter sensor", the ecm reads the crank sensor, if it's spinning faster than starter speed, the ecm disengages the starter...that being said, your starter motor is bad. Stick with Delco, aftermarket reman starters are hit or miss, mostly miss.
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Old 10-25-2012, 10:45 AM   #13
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Default Re: Duramax starting issue

If it were my repair my first choice would be a new starter from the mfg. - Still Delco?
Second choice would be a new (Delco) bendix on the old starter - replace brushes while it's out.
I would not buy a rebuild starter - ever.
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