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2018 5.3 SILVERADO WONT START BATTERY OK

terry pierce

By terry pierce
in Engines & Drivetrain

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MY164X4 Enthusiast

MY164X4

Posted
Posted

Check your battery with a multi meter.


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Donstar Senior Enthusiast

Donstar

Posted
Posted

I agree that the battery will be your culprit. I'm not surprised when a vehicle battery packs it in after a year or lasts closer to ten.   If your truck is still under warranty, I'd take it to the dealer in case there is some other electrical issue.  

Eddie 70 Senior Enthusiast

Eddie 70

Posted
Posted

I once drove my truck to the bank to pick up a check because I was on my way to trade my current truck. Truck started and ran fine to the bank. Came out to start the truck. The interior lights and everything came on just like always. Hit the starter and everything went black. No lights, no dings, nothing. I opened the hood to check battery connections and the side of the battery at the post was blown out. A new battery and the truck was traded later on in the evening.

I always check my connections if I have any kind of starting issues. However, if the starter sounds like it is dragging, do not grab the bare posts with your hands. You will burn your fingers!! Hindsight............

HeySkippyDog Senior Enthusiast

HeySkippyDog

Posted
Posted
Check your battery with a multi meter.


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Can't rely on just that, the system isn't loaded. Need a big resistor in line. You may have great voltage under no load, but it drops when it does get resistance.

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nominion Enthusiast

nominion

Posted
Posted

This happened to me a few times with my 2018 Sierra. I checked the obvious things and didn't find anything. 

 

On a whim, I cleaned my keys and inside the ignition with electrical connection spray cleaner. I was surprised how much stuff came out of the ignition. I haven't had a problem since doing it a month or so ago. 

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Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted

Simple. The battery has its rating call cranking amps. A batt can have 12vdc all day and not have the (Heart) to start due to the loss of its cranking ability via cranking amps.

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Not important what the voltage is without a significant load. What's the voltage when drawing a  load. That requires a load resistance device. Something like this. 

 

100A 6/12v Battery Load Tester

 

 

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dieselfan1 Senior Enthusiast

dieselfan1

Posted
Posted

I just replaced the battery in my 2018. 38,000 miles not quite two years old . 

Same deal, no start. 

Batteries are a crap shoot. Some last six or seven years, some last two. Sad.

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Replaced the new one that came with my Buick after it drove me nutty tossing messages at me for weird stuff. New Wally World battery was put in it just before I bough it. Had a dead cell straight away. 10.2 volts. Just enough to start it but it would dip low enough to set confuse the ECU and BCM. Interstate batteries have worked well for me. No lemons in decades of use. Everyone will have a favorite. 

diyer2 Senior Enthusiast

diyer2

Posted
Posted

My experience.

With the DVM leads on the battery posts have someone try starting the vehicle. Yes put a load on the battery. 

If the batteries voltage falls below 10.5 volts when the starting load is applied I would replace it. 

 

 

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
9 minutes ago, diyer2 said:

My experience.

With the DVM leads on the battery posts have someone try starting the vehicle. Yes put a load on the battery. 

If the batteries voltage falls below 10.5 volts when the starting load is applied I would replace it. 

 

 

 A very good method. :thumbs: Battery doesn't care where the load comes from, right?

diyer2 Senior Enthusiast

diyer2

Posted
Posted

I have said this before. When we were both working I put new batteries in our vehicles every 4 years. Not worth a no start in January at 5 degrees and 30 miles from home late evening in the dark. Especially not going to put the wife in this situation.  Now retired and having a garage to park my truck in I keep it on a maintainer. I will use the 10.5 volt at start as an indicator to replace it.

I also refuse to jump start anyone. 

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