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P1682 crazy electric problems

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chevguy52325

New member
Ok guys I'm new here but I sure hope you can help us out. I'm working on my wife's car its a 2007 Pontiac gp gxp. I just installed a new tep transmission after setting for 2 years. All went well except battery kept going dead over night (new battery) so checked alt is good then replaced starter as soon as I hooked up the battery the engine tried to turn over (key out of ignition) so found car was throwing code for ignition switch or ecm bad (can't remember what number code) so I installed new ignition switch same problem after so I bought a used ecm off eBay programmed to my vin and then theft system prevented starting even though car would randomly try to start itself. Next I took it to gm dealer after I couldn't get the key relearn to work. They said bcm was bad along with key tumbler assembly they replaced them 800 later I still have original issue. They said fuse panel is bad. I brought it back home removed panel and dissasembled it. I found a small amount of corrosion but nothing alarming I cleaned it and reinstalled. I then had code p1682 after clearing it would come back on next key cycle then I cleared again and it stayed off I drove car about 5 miles no problems came home turned car off now if I turn key to run position and back off check engine light turns on even without key in ignition if I start car then light goes out. I'm baffled any help greatly appreciated thanks fellas
 


Which ground lol I would have thought the stealership service would have checked those also I have cleaned/checked the ground next to battery also
 
I should also add their is a clicking from one of the under hood relays not sure which one I will have to investigate more tomorrow
 


No aftermarket electronics does have factory remote start. Relays have all been swapped. I'm wondering if it's a harness issue or fuse panel still I just dont know where to start anymore. Where is common run spota in harness. I just had engine out and nothing was broken that I noticed also before I tore out engine and trans the car had a problem with battery going dead over night so I dont think this is something I caused lol
 
Turbo charged is right, I had a major problem in the beginning. I had to take the column apart to find this wire that someone had stripped for a starter and left it bare. replace line and all was well. parasitic drain test while unplugging fuses and relays would be my first step. Unless your starter wire is fubared somewhere.
 
Ok came back for lunch turned off car and split second starter engage and car kept running for about 2-3 seconds I'm seriously wondering if it's in the ignition switch even though its new
 
By the way current code is p1682 which according to my Mac scan tool says manufacturer controlled computer circuit searching internet I can find nothing for this
 


Ok fellas I replaced ignition switch again no luck so I checked grounds again and replaced a few wire ends still no luck I'm lost I dont know what to do now should I try replacing fuse panel?
 
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