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Won't go into V4 mode

Loco-diablo

By Loco-diablo
in Troubleshooting & Recalls

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Loco-diablo Senior Enthusiast

Loco-diablo

Posted
Posted

I ran into an issue this morning. I was on the highway going about 70 mph (flat terrain), the CEL came on for a few seconds (2-3 seconds), then went out. I noticed after that the truck wouldn't go into V4 mode like it always does.. It appeared to be running ok the following 20 miles or so to work, as I didn't notice any noises or power loss..it just would deactivate to V4..The CEL never came back on during the rest of my drive.

We'll see how it behaves on my ride home this afternoon..Do I have a problem? 2017 Chevy 5.3.. 43K miles.

BigBadSierra Senior Enthusiast

BigBadSierra

Posted
Posted

You will need to get the codes read off and see what it complained about.  Most likely a miss fire. 

 

The V4 will disable if your have cylinders reporting a miss fire.

 

My 2016 did the same thing when I had CEL but it was caused from washing the top end with GDI intake cleaner.

 

The truck didn't go back to V4 until after I cleared the codes.

 

I'm not sure if it will reset after a certain amount of time on it's own.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

"Little known fact"; I've always wanted to say that. :) A cylinder can misfire up to 15% of the spark cycles before the driver will feel it doing so. 2X on a code read but explains why it could and it seemed to be 'running fine'. Just FYI. 

Loco-diablo Senior Enthusiast

Loco-diablo

Posted
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Posted
I'd still see what code is set in the ECM.  Obviously something turned the light on. 

I’m curious as well.. I’ll try to get the code.
Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Unplugged my MAF once and it upset my ECU setting off the second stage of the oil pump for the entire key cycle. Off and back on.....cleared the code and it never happened again. Ghost in the machine. Static spark? Computers, right? 

  • 4 years later...
  • 8 months later...
FallenOne6 New Member

FallenOne6

Posted
Posted

So about a month ago I changed the spark plugs on my 2018 Tahoe Premier 5.3 4x2, 122k miles, had this truck for a little over a year now; I took a long drive to Tennessee and probably a week or so later I started to feel it stumble or stutter but there was no CEL.

 

A few days ago my wife and I were driving and she noticed the CEL was flashing for a few seconds then stopped; then flashed again then never came back on. Took it to AutoZone to see if the can find the codes or anything, and nada. Took it to a Jiffy Lube, and nada. They couldn’t find what it was. It hadn’t came back on since, until today I was about to make a decent trip to Kansas for work. Probably, about 100mi into the drive the CEL kept flashing, and it would not go into V4 and when I started braking it would “jolt” a bit. 
 

any ideas? I’m basically chasing a misfire and maybe something else. 

newdude Senior Enthusiast

newdude

Posted
Posted
14 hours ago, FallenOne6 said:

So about a month ago I changed the spark plugs on my 2018 Tahoe Premier 5.3 4x2, 122k miles, had this truck for a little over a year now; I took a long drive to Tennessee and probably a week or so later I started to feel it stumble or stutter but there was no CEL.

 

A few days ago my wife and I were driving and she noticed the CEL was flashing for a few seconds then stopped; then flashed again then never came back on. Took it to AutoZone to see if the can find the codes or anything, and nada. Took it to a Jiffy Lube, and nada. They couldn’t find what it was. It hadn’t came back on since, until today I was about to make a decent trip to Kansas for work. Probably, about 100mi into the drive the CEL kept flashing, and it would not go into V4 and when I started braking it would “jolt” a bit. 
 

any ideas? I’m basically chasing a misfire and maybe something else. 

 

 

Scan for codes.  

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