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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 07-31-2010, 09:08 AM
9365turbo 9365turbo is offline
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Default Service engine soon and priming the engine

My service engine light comes on intermittently. Also I have to prime the system the same. Mostly when I drive for a while and the outside temp is hot. Above 80. I have a edge juice on the truck no moniter. The condition was happening quite alot when hauling my camper using tow haul mode. Juice at zero. Thanks for any info or fixes.
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Old 07-31-2010, 10:47 AM
DmaxMaverick DmaxMaverick is offline
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Remove the Edge and try again. Diagnostics does no good with it connected, and a little vehicle info might be helpful.

If you have to prime the fuel filter to start, you have a fuel (air) leak. Change the fuel filter and/or verify it is installed correctly. In most cases, it's as simple as that.
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Old 07-31-2010, 11:18 AM
9365turbo 9365turbo is offline
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ok. I will give that a try. The truck is a 02 Sierra with a cold air intake and 4" exhuast other then that all stock. Changed the head gaskets in Feb 2010. It has been awhile since I changed the fuel filter though. Thanks
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Old 07-31-2010, 11:37 AM
Kennedy Kennedy is offline
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It would be nice to know what DTC is being set.
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Old 07-31-2010, 06:05 PM
9365turbo 9365turbo is offline
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I was only running level 1. Stock on tow haul. Not sure what DTC is.
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Old 08-01-2010, 12:48 AM
DmaxMaverick DmaxMaverick is offline
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DTC = Diagnostic Trouble Code: The code that will be present any time the SES lamp is lighted.
As John said, it is helpful to know the code to aid in the diagnosis.

The Edge level is not important. It must be removed to eliminate it as a cause. If it was, it wouldn't be the first time. However, if the condition and SES can be repeated, change/repair/remove only one thing at a time. If you change more than one, you won't know what was the cause.
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Old 08-01-2010, 10:30 AM
9365turbo 9365turbo is offline
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Do I need a code reader? I removed the edge. I drove about 10 miles yesturday with it removed and the SES light came on when I parked. It wasnt on when I drove home.
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Old 08-01-2010, 10:43 AM
DmaxMaverick DmaxMaverick is offline
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Yes, you need a code reader. Or, ask your local Autozone if they read codes. Many of them will do it for free.

I suggest doing nothing until the code can be retrieved. It may or may not be related to a problem you can see. If you aren't experiencing limp mode or a driveability problem, it's hard to say.

What of the "prime the system" issue? If you have an air leak, it can cause the SES lamp. In any case, get the code read. And, leave off the Edge until you get the current issue resolved. Not knowing the problem, using it may be damaging.
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Old 08-01-2010, 11:25 AM
9365turbo 9365turbo is offline
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I will leave the edge off. Will there be a trouble code if the light stays off? The truck has no driveability problems.
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Old 08-01-2010, 06:32 PM
DmaxMaverick DmaxMaverick is offline
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The code will be in memory for several start and/or warm-up cycles depending on the code, but not indefinitely. Check as soon as you can. You may find more than one code, as not all of them will command the MIL.
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