Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
How long does it take to make the battery go dead?
um as soon as i shut it off it takes a few mins before it goes dead, when the battery is charged and i try to start it up it will sound like its abt to start but then just sputter
and all my electrical doesnt work and it says unknown driver in the in dash thing
Ok, lets start with this, take the battery and have it tested. We need to start with a solid base, in this case battery fully charged and known to be good prior to all other testing
ok i was at autzone a few hours before that and they said the battery is good
and so was the alternator
all my fuses are good but everytime i shut the car off and leave it off it dies
Is there anything installed that is not GM?
nope everything is stock except rims and tires and that should be a problem
ive read up online about the "unknown driver" message displayed and people say you need a new ecu
ok, then you need to do the test. CLICK HERE FOR DIRECTIONS
and that is going to do what? ive tested all my fuses and none are blown at all
It will determine which fuse and branch the drain on the system is.
ok, even when the battery wasnt being drained none of the electrical was working and the car wouldnt go into 4 lo and the radio wouldnt work and i mean no electrical at all and it would start and there was a message displayed in the electronic odometer saying "unknown driver"
This could mean a bad Body Control Module
and where is that located and is there a test for that/
That is under the steering column and the testing I outlined is one part of the test. It is a computer so the testing is complicated and needs some special tools.
hmm ok so if i replaced the body controle module should that fix the problem of the "unknown driver"
and make my electrical work?
There is a chance yes, but without testing we cannot know and to simply replace it would be guessing at this point. That is why I posted some instructions.
ok so for those instructions do i need any special tools or is it that basic
That you need an electrical meter that will read DC amps.
ok, now if i do that test that will show where my power is being drained to and it will determine whether or not my body control module is good or not?
That is the idea yes. USually if you find the power drain, that will correct the other issues.
ok so find out where the power is being drained then cut that off and see where that takes me, after that if it still displays the "unknown driver message then i need a new body control module
YEs that may be the case. don't get too far ahead.
i wont, what im gunna do is tomorrow im going to have a family friend go through the electrical and see where the power is being drained from but i have a good idea where it is going, then im gunna see if that fixes the power drain issue
then if the truck starts and functions ok im going to wait to monday to see if it still starts and everything goes good, if it happens to display the "unknown driver" message im going to change the body control module
If the fuse is for a module then you may need to replace the module. and it is my though that the BCM could be that module, but the test will tell.
so is that what i should do?
See what fuse is pulling the power then get back to me.
There are far too many "what ifs" to spell them all out here.
ok will it cost me more money or is it a one time fee?
Bookmark this page so you can easily navigate back to it, and so you know, you can reply at any time for follow up information regarding this issue, even after you accept my answer and I will reply.
ok and how much do the body control module's usually cost and its located under the steering wheel in the dash right?
300 or so plus programming.
ok and is there a certain place i could buy that from that i know ill be getting the right product? and where was it located in my tahoe?
That is the module under the steering column. If you as for a Body Control Module for your vehicle, any part store should be able to get you the proper one.
ok ill be replyin to this message sometime tomorrow after noon, ill talk to you then and tell you how it went while i was finding the power drain
thanks buddy ill talk to you tomorrow
hey you there?
how do i check to see if there is a shortage? is there a cheap tool i can buy that will allow me to check those things easily?
to scan what the OBD? bcuz i did and all that came up was my bad o2 sensors and i got them fixed