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Immobilizer Intermittent? Engine Not Cranking Over?

Tiny
HUNDS
  • MEMBER
  • 2018 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 12,000 MILES
I have a 2018 Chevy Silverado Z71 4x4. When I turn off the ignition, intermittently I cannot restart the engine for 10 minutes. All lights on the dashboard light up, to include the security light, and work normally even though the engine will not crank. There are no warning lights or alarms before or after I turn off the ignition. After 10 minutes the engine cranks and starts normally. Remote start is inop for the 10 minute interval. Using my spare key and FOB does nothing, for 10 minutes.
I have had it to 2 dealers and both say there are no trouble codes, they cannot duplicate the no crank condition, and the system is working fine. Since it usually does it upon returning home I thought it was the vibration from the dirt road I live on. Not the problem. Then I thought my electric gate or garage door opener was the problem (one service tech also thought that was the problem). Not the problem either. It is now intermittently doing it everywhere I go, not just my driveway.
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Friday, January 25th, 2019 AT 10:51 AM

42 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Hello,

It sound sliek the BCM is having a problem which is where the security is held. The 10 minute reset gives it away to me. Here are the security and immobilizer wiring diagrams so you can see how the system works with the BCM location so you can change it out. It will need to be programmed in should cost about $130.00.

https://www.2carpros.com/articles/starter-not-working-repair

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Saturday, January 26th, 2019 AT 12:13 PM
Tiny
HUNDS
  • MEMBER
  • 2 POSTS
Thanks for the help. The wiring diagrams are particularly helpful since GM will not release data for 2018 service manuals to Helm for sale to the public until Apr 2019. The dealer service dept. Explanations were just not satisfactory. I'll let you (and the dealer service techs) know what I find.
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Saturday, January 26th, 2019 AT 2:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
That would be great :)
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Monday, January 28th, 2019 AT 12:47 PM
Tiny
JOEYDAVIS
  • MEMBER
  • 2 POSTS
  • 2008 CHEVROLET SILVERADO
  • 140,000 MILES
Turn the ignition truck will not start. Makes a typewriter like clicking noise. I changed the battery to no avail.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Either we have a bad connection or the starter is bad. Make sure the battery terminals are clean and tight. If you have a weak connection, this can happen even with a new battery.

Next, check to make sure the ground wire from the battery is securely attached to the engine block. Again, make sure there are no corrosion issues or damaged wires.

__________________

Here is a link you may find of interest. It discusses what can happen with a loose or corroded connection at the battery.

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

Let me know what you find or if you have other questions.

Take care,
Joe
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

It sounds like you might have a failing starter motor solenoid. Once you remove the starter motor from your truck auto parts stores will test them for free. Here is a few tutorials relating to starter motors and replacement:

https://www.2carpros.com/articles/how-a-starter-and-solenoid-works

https://www.2carpros.com/articles/how-to-replace-a-starter-motor

I've attached picture steps below on how to remove and replace the starter motor and solenoid assembly on your truck. Hope this helps and thanks for using 2CarPros.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
ERIK BETTS
  • MEMBER
  • 1 POST
  • 2015 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
Everything turned on as normal. Then hooked up cables to car and tried the ignition and now there’s only dome lights, door ding. No dash lights no gauges no radio. Headlights still come on. But no crank at all now. Today we hooked up cables and had spark when connecting but after an hour still nothing. No change. This is third time battery went dead but first time it hasn’t fired right up with jumpers.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Sounds like you need a new battery. The jumper will not work if your battery is shorted. It will drag down the jumper battery.

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

I would replace the battery since you have had several issues with it already.

Roy
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
JASON ANTUNA
  • MEMBER
  • 3 POSTS
  • 2013 CHEVROLET SILVERADO
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Truck will not crank or start in cold mornings, only dashboard lights come on and radio does too. However, in the afternoon once sun is out the truck works fine.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

It sounds like a connection issue. Clean the battery cables with a wire brush after removing them from the battery to get a good, clean tight connection.

This guide can help us fix it

https://www.2carpros.com/articles/starter-not-working-repair

Roy
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
JASON ANTUNA
  • MEMBER
  • 3 POSTS
The first time this happened to me I cleaned the cables with contact cleaner and a wire brush and it worked fine for about a week and it started doing the same thing. So I replaced the battery and nothing. AutoZone checked my alternator and starter and they work fine. I am starting to think I need to replace the ground cable but I am not sure. I am running out of ideas.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
JASON ANTUNA
  • MEMBER
  • 3 POSTS
If I were to need to replace a cable which one would it be? Any ideas?
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would replace both cables. They tend to get dirty inside the bolt area. That is tough to get and even tougher to clean.

Roy
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
DANIELLE RADER
  • MEMBER
  • 1 POST
  • 2012 CHEVROLET SILVERADO
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 2 MILES
I went to get in my truck go to turn the key to start, my gauge lights come on, headlights, radio, etc, but then nothing. Doesn't even try to start. Outside you can hear the starter trying to ignite, but no luck. Haven't had any trouble at all until today. I don't know where to start. I was told it could be in the brain box how can I tell?
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
There are numerous things that can cause a no-crank condition. Take a look at the article below for more specifics. You mentioned that you can hear the starter trying to "ignite". What exactly are you hearing? Do you hear a single, loud click noise when the key is turned to start?

Let me know.

https://www.2carpros.com/articles/starter-not-working-repair
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
DAVID W. CHAPMAN
  • MEMBER
  • 6 POSTS
  • 2012 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 152,000 MILES
I bought this truck about one month ago. I have problems starting it after stopping and trying to restart it this has happened a few this. Some times it takes longer then others. Everything works wont turn over. I have a new battery. Need some help please.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try resetting security system this guide should help us.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
DAVID W. CHAPMAN
  • MEMBER
  • 6 POSTS
The truck wont try to start it wont turn over. If it was fuel pressure it would try and would not fire off. When the truck does not start I can sit there and keep trying and it will turn over and then start and be fine till it wants to do this again.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check battery for condition including load test most places do for free. If you hear a click at starter have somebody try to start it and you hit the body of the starter with a hammer. If it starts the starter is more than likely bad. If you do not hear a click or anything similar then it is probably a security issue so if no manual look online for your vehicle on how to reset it. It may be the problem anyhow due to you replacing battery because when you replace a battery it engages the security feature.
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Monday, January 25th, 2021 AT 11:38 AM (Merged)
Tiny
DAVID W. CHAPMAN
  • MEMBER
  • 6 POSTS
Load test was done after new battery everything showed good. This was doing this before new battery. The starter does not click. Would the security issue come and go? Would it not do it all the time?
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Monday, January 25th, 2021 AT 11:38 AM (Merged)

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