Duramax Diesels Forum Truck of the Week
  #1  
Old 01-08-2014, 04:53 PM
Rerywilson277's Avatar
Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
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Default 02 lb7 battery light and guages

Hello all, i apologize if this is in the wrong area as this is my first post.
I have a 2002 Chevy lb7 duramax, the problem is that the battery light display is on in the message center as well as the security display and the low fuel display. Also, the engine temp gauge and fuel gauge reads zero and i know i have half a tank of fuel. this is also the same when the truck is running
So its:
Battery light
security light
low fuel light
fuel gauge
engine temp gauge

the batteries were bad so i thought that might be the problem and was going to replace them anyway so i bought two diehard agm batteries. and the problem did not go away, so i took it to my local shop to have them reset all the codes. and this is the weird part, when he plugged in the scanner all the lights went off, the temp and fuel gauges started working, and there were no codes to read. as if there were no issues at all. then as soon as he unplugged it it went back to all the same issues. we tried a couple of times with the same results.
so i dont know if there may be a short somewhere or a fuse but i have no clue what is causing this.
If someone knows what the problem is that would be great. thanks in advance.
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  #2  
Old 01-08-2014, 05:04 PM
DAVe3283's Avatar
DAVe3283 DAVe3283 is offline
Why not?



 
Join Date: Sep 2009
Location: Boise, ID, USA
Truck: CC/SB
Engine: LB7
Transmission: Automatic
Posts: 1,353

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Sounds like a bad ground or broken wire.
It would be worth checking the fuses, but also look for any wires that move when the OBD2 plug is moved. There may be a problem in there.
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  #3  
Old 01-08-2014, 05:51 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

Default

alright, tomorrow morning ill check all of the grounds that i can find and look under the fuse box to see if any wires got disconnected somehow. thank you for the reply
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  #4  
Old 01-09-2014, 12:53 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

Default

i recently installed an aftermarket radio, would a bad ground on the radio cause my issues?
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  #5  
Old 01-12-2014, 02:15 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

Default

okay so i took off, sanded and re ground the ground under the drivers side door, behind the front bumper on drivers side, and the braided one on the firewall. plus i checked all of the fuses. no luck. so as i was looking all over in frustration i found a connector by the fuel filter that has nothing plugged into it but i dont see any wires loose or hanging down. what is this connector for?
I need to get this thing fixed but am running out of ideas.
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  #6  
Old 01-12-2014, 02:51 PM
TheBac's Avatar
TheBac TheBac is offline
Why do I keep doing this?

 
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Location: Mid Michigan
Truck: 2003 GMC CC/SB
Engine: LB7-Z
Transmission: Automatic
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Did you do your own wiring on the radio? Possibly grounded/shorted something you shouldnt have. Recheck that first.
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  #7  
Old 01-12-2014, 02:57 PM
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SouthernsuspensionCEO SouthernsuspensionCEO is offline
'04 lb7 zf6 cc/sb 4x4
 
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Location: Memphis Tennessee
Engine: LB7 ZF6
Transmission: Manual
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It is defiantly a bad ground, and def a bcm related issue...check your grounds
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  #8  
Old 01-12-2014, 02:58 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

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yeah i did. i checked it today. i even tried grounding the radio using the fixing screw on the back of the radio to the metal mount behind the radio.
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  #9  
Old 01-12-2014, 03:00 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

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does the gauge/ecm grounds go to the drivers side cab mount? or is there another ground im not aware of? thank you for the help
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  #10  
Old 01-12-2014, 03:03 PM
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SouthernsuspensionCEO SouthernsuspensionCEO is offline
'04 lb7 zf6 cc/sb 4x4
 
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Location: Memphis Tennessee
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Transmission: Manual
Posts: 20

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There are multiple grounds, there's two grounds under the dash on the firewall, also is the check engine light on?
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  #11  
Old 01-12-2014, 03:06 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

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the service engine light comes on when you turn the key but goes away after the truck starts. although it has always done this and thought it was normal.
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  #12  
Old 01-12-2014, 03:12 PM
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SouthernsuspensionCEO SouthernsuspensionCEO is offline
'04 lb7 zf6 cc/sb 4x4
 
Join Date: Jan 2014
Location: Memphis Tennessee
Engine: LB7 ZF6
Transmission: Manual
Posts: 20

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That is normal...the cluster comes out very easy, pull it out, check ur connections, but my money is on a ground.
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  #13  
Old 01-12-2014, 03:20 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

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okay i can get a picture if need be but i just took a look under the dash. there is a blue wire that runs behind where the flasher unit is and there is a red wire spliced into it that doesn't connect to anything, it has a c prong end on it.
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  #14  
Old 01-12-2014, 03:23 PM
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Rerywilson277 Rerywilson277 is offline
2002 LB7
 
Join Date: Nov 2013
Location: Havre de Grace, Maryland
Truck: 2500HD Silverado
Engine: LB7
Transmission: Automatic
Posts: 17

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i hope the picture shows up, i am new to this forum
the picture is turned sideways for some reason
Attached Images
File Type: jpg IMG_0531[1].jpg (183.0 KB, 13 views)
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  #15  
Old 01-12-2014, 03:25 PM
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SouthernsuspensionCEO SouthernsuspensionCEO is offline
'04 lb7 zf6 cc/sb 4x4
 
Join Date: Jan 2014
Location: Memphis Tennessee
Engine: LB7 ZF6
Transmission: Manual
Posts: 20

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Picture please
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