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Old 05-19-2009, 08:20 PM   eBay Motors  #1 (permalink)
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04 duramax wont start after changing battery

batteries were weak so I pulled them out and picked up 2 new ones, NOW truck will NNOT start. I check fuse and what i found out is that if I pull the fuel pump 20 amp fuse and reinsert it, It will start if I turn the ignition withing 20 seconds or so, after a little time, I hear a relay kick out and it will not start.
I can re pull the fuse and reinsert ( only with the switch on) and I have a 20 sec or so window that it will start.
Is this related to the battery replacement or what?
any ideas of how to fix?
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Old 05-19-2009, 09:59 PM   eBay Motors  #2 (permalink)
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Bump..... Thats messed up. Are u sure u put positive to positive on both?
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Old 05-19-2009, 10:00 PM   eBay Motors  #3 (permalink)
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make sure the terminals are tight, just because you buy new batteries off the shelf doesnt mean they are good either
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Old 05-19-2009, 11:03 PM   eBay Motors  #4 (permalink)
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bump Tighten the cables on real good my truck did this the other day kinda. it wanted to start but kept lossing connection tightened them up and worked like a charm.
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Old 05-20-2009, 03:15 AM   eBay Motors  #5 (permalink)
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If you removed both batteries at the same time (neither hooked up) you may have tripped the VATS, or Vehicle Anti Theft System.

What you can try is turning the ignition to "ON" and leaving it for 30 minutes without trying to start it. This is supposed to reset the VATS.

As well, check terminals as others have suggested.

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Old 05-20-2009, 05:26 AM   eBay Motors  #6 (permalink)
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I have plenty of power from the batteries, and it turns over very well.
I just dont have any fuel going to the engine becasue of some kind of switch.
I will try the VATS system suggested .
tks.
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Old 05-20-2009, 06:32 AM   eBay Motors  #7 (permalink)
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I have tried the VAT procedure.
switch on for 10 min, then off then on for 10 then off then on for 10 for a total of 30 minutes. no luck
I have plenty of battery power.
again,
when I pull the PCM B fuse, while the switch is on, it resets something, then it will start. If I turn it off, it will immediately crank again. BUT if I let it set 15-20 seconds, I hear a relay click and it will not start again, until I pull the PCM B fuse again.

This all started yesterday after pulling both batteries and letting it set overnight before replacing them with new ones.

this fuse ( PCM B ) controls the ( power train module and fuel pump)

Somebody help, called dealership here this morning, they said they had no clue.
,
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Old 05-20-2009, 07:07 AM   eBay Motors  #8 (permalink)
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well there is no fuel pump on a dmax. Just the cp3 that sucks fuel from the tank. So it's not for lack of fuel. Not sure whats going on though. Maybe one of the Gm techs will be on here and know whats up.
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Old 05-20-2009, 07:11 AM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by rackmaster2 View Post
I have tried the VAT procedure.
switch on for 10 min, then off then on for 10 then off then on for 10 for a total of 30 minutes. no luck
I have plenty of battery power.
again,
when I pull the PCM B fuse, while the switch is on, it resets something, then it will start. If I turn it off, it will immediately crank again. BUT if I let it set 15-20 seconds, I hear a relay click and it will not start again, until I pull the PCM B fuse again.

This all started yesterday after pulling both batteries and letting it set overnight before replacing them with new ones.

this fuse ( PCM B ) controls the ( power train module and fuel pump)

Somebody help, called dealership here this morning, they said they had no clue.
,
That's not how you reset the VATS, at least, AFAIK. You switch the ignition to "ON" and leave it for THIRTY MINUTES without interruption.
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Last edited by rkeithdavis; 05-20-2009 at 07:15 AM.
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Old 05-20-2009, 09:12 AM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by rackmaster2 View Post
I have tried the VAT procedure.
switch on for 10 min, then off then on for 10 then off then on for 10 for a total of 30 minutes. no luck
I have plenty of battery power.
again,
when I pull the PCM B fuse, while the switch is on, it resets something, then it will start. If I turn it off, it will immediately crank again. BUT if I let it set 15-20 seconds, I hear a relay click and it will not start again, until I pull the PCM B fuse again.

This all started yesterday after pulling both batteries and letting it set overnight before replacing them with new ones.

this fuse ( PCM B ) controls the ( power train module and fuel
pump) according to book

Somebody help, called dealership here this morning, they said they had no clue.
,
Still needing help from a super tech!!!!!!!!!!
This fuse is controlling something or a module that is allowing it to crank.
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