Question about 2001 GMC Sonoma Extended Cab

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2001 GMC Sonoma 4.3l acts like battery is dead

I have a 2001 Sonoma. Sometimes the truck will just die and I will have no power. Not even the dome light will come on. When I try to restart it I get nothing not even a click. I have had the battery checked by 2 diffrent places both saying it is a good battery. If I unhook the battery for a few minutes and hook it back up the truck will start just fine. This may happen 2 or 3 times a week and then may go for a month without a problem. What am I missing here?

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Maybe the main Ignition relay in your fuse box or on the firewall. Faulty relay can cause intermittent no-power situations.

Posted on Jan 07, 2009

  • Tim Higgins
    Tim Higgins Jan 07, 2009

    Maybe the main Ignition relay in your fuse box or on the firewall. Faulty relay can cause intermittent no-power situations.

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Have a 2001 gmc sonoma has code p1621 control modle long term menory perfprmace what is the fix for this code


I would disconnect the battery for a few min then hook it back up to see if it resets itself. if not you have bad cell in the battery and needs to be replaced. good luck

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Hello ,
The area you need to check ( check owners manual) is most likely this is two issues that could be. It could be your fuel pump relay , that is what triggers your fuel pump to work.Or your fuel pump itself. However first thing I would check is your fuel pump relay, which is normally square like fuse, check fuse box area, or sometimes it is under hood near firewall in a box, with other fuse relays. Thanks Mike

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Hey there JC

Could be the batterey, but I'm leaning toward cables or terminals. From your description its acting like the battery isn't there, even when you jump it.

Questions:
  1. When you jumped it, did the other vehicles engine bog down at all?
  2. Do the head lights work?
  3. Is there any evidence of power? even the dome light?
First steps:
  • Test the voltage on your battery
  • Remove, clean and reattach battery terminals
  • Check the battery cables, good connection on both ends? no breaks, wear, anything odd?

Comment me back with your findings, we'll take it from there
Mike

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