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Will not start, locks and windows do not work

Tiny
HBUTLER56
  • MEMBER
  • 2007 GMC SIERRA
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
Lights and alarm works. When key in in start position lights on dash go out but nothing happens.
Sunday, June 30th, 2019 AT 4:52 AM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The first thing I would do is to clean the battery terminals as it sounds like you are losing voltage.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Also, check the voltage of the battery while at rest and with the key in the start position. Without proper voltage nothing will work correctly.

https://www.2carpros.com/articles/car-battery-load-test

Roy
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Sunday, June 30th, 2019 AT 5:17 AM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
Dealer just replaced battery and all new cables less than two months ago, after leaving battery disconnected over night it cranks sometime. Drove it down the road and now I get the same problem. Electric locks don't work, windows don't work. Then I can go back to it and everything works.
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Sunday, June 30th, 2019 AT 8:40 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to check the voltages as I suggested.

Sounds like a low battery or bad connection.

Roy
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Sunday, June 30th, 2019 AT 8:42 AM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
I have checked voltage and and pulled and cleaned all cables, same thing dealer told me, when they told me it was battery and cables, and $1,200.00 later I am back with same problem.
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Sunday, June 30th, 2019 AT 8:45 AM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
Thanks for the help.
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Sunday, June 30th, 2019 AT 8:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

What is the voltage at the battery while resting?

What is the voltage when the key is in the start position?

Roy
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Sunday, June 30th, 2019 AT 8:48 AM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
12.15 just battery
11.75 with key on
14 with it running
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Sunday, June 30th, 2019 AT 12:25 PM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
Seems like after it gets warm is when the problems start.
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Sunday, June 30th, 2019 AT 12:27 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Battery very low. Should be 12.6.

At 12 1 you have less than 25 percent of the battery charge working.

Roy
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Sunday, June 30th, 2019 AT 12:27 PM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
Then I suppose I need to take It back to the dealer, because they just put the battery in about two months back.
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Monday, July 1st, 2019 AT 5:09 AM
Tiny
HBUTLER56
  • MEMBER
  • 8 POSTS
The battery does not seem week, be cause when it will spend over it fires right up. You can wait a while and it fires right up, but once the truck warms up it may or may not turn over and when it wont turn over. All the lights light up on dash and I get all these warning messages. Not sure of that helps.
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Monday, July 1st, 2019 AT 5:12 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Again, 12.1 volts is very low. It is very weak.

You need to charge to 12.6 volts and then try it again.

Roy
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Monday, July 1st, 2019 AT 6:39 AM

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