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Gary, GM Technician
Category: GMC
Satisfied Customers: 1178
Experience:  Senior Technician
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GMC 1500 Series: 2003 gmc 1500 wont crank

Customer Question

2003 gmc 1500 wont crank
Submitted: 2 years ago.
Category: GMC
Expert:  Jerry replied 2 years ago.
Hello and welcome. My name is ***** ***** you for visiting the site, I will be happy to assist you today.
What is the voltage to the starter?
Customer: replied 2 years ago.
Dont know
Expert:  Jerry replied 2 years ago.
I see. How may I help you with it?
Customer: replied 2 years ago.
Thats too advanced
Expert:  Jerry replied 2 years ago.
I see, that could be a few things but we would be guessing at it without knowing what sort of voltage there is either at the starter, relay or switch.
Thank you.
Customer: replied 2 years ago.
New,expert please
Expert:  Jerry replied 2 years ago.
Expert:  Gary replied 2 years ago.
Hi there,
I will try to offer some assistance.
Jerry had asked you for the starter terminal voltage.
You say the headlights are bright, so we'll assume the battery to be reasonable.
I don't know what you mean by "battery shows up to 1" 1 what?
You need to get a scan tool on the car to see what modules are either not communicating and/or what DTCs are set.
Your BCM is probably not recognising your key, but until you scan for DTCs, that will be only an educated guess.
Don't waste your time looking at anything else, if you think the battery voltage is ok.
Get hold of a GM scan tool.
Customer: replied 2 years ago.
I had it on low volatge charger all night. That shows.a1 before was a 6. Yes headlights bright. Is their a key sequence to do after battery unhooked? There is a light on dash with engine and lock key shows up for.few seconds
Expert:  Gary replied 2 years ago.
Ok, the lock symbol is the immobiliser not reading your key correctly.
Do you have another key?
Do know anybody that can reprogram your keys and/or read vehicle DTCs?
A mobile car locksmith might be able to do this for you.
I don't know of any sequence, because I would class it abnormal to have no battery for 2 months.
I would have a scan tool on it by now.
It is definitely a key reading issue, so don't worry about anything major as yet.
Hope this helps.
Customer: replied 2 years ago.
Work in north dakota truk.was in wa state so disconnect battery when i leave.
Customer: replied 2 years ago.
Will get a scan tool when they open.. its only 530am here. Their is a buzzing noisr whrn key in on position in a tiny speaker above driver. ?on star?
Expert:  Gary replied 2 years ago.
Ok, I would get a battery maintainer (more fancy battery charger) and float the battery while still connected while your away. Have done it with my own cars. Charger can be setup as a timer.
Interesting about the noise from a speaker. Onstar is your GPS?