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Old 03-03-2017, 06:14 AM #1
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VSC causing trouble
So I've had an ongoing issue with my VSC: when it's working, I hit the gas and tend to get some weird kind of lag - no power to the wheels no matter how far down the gas pedal goes.

Most of the time the Check Engine light, VSC TRAC and VSC OFF lights are on, and the above issue doesn't manifest. So obviously it's something to do with that, but I can't find a code or source of the problem. Any ideas?
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Old 03-03-2017, 06:40 AM #2
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I ran into the same problem... Here's a link https://m.youtube.com/watch?v=vPTIi_tgQtQ Only thing I did different was I just terminated/cut the "Red Wire"
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Old 03-03-2017, 09:36 AM #3
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Quote:
Originally Posted by TJM View Post
So I've had an ongoing issue with my VSC: when it's working, I hit the gas and tend to get some weird kind of lag - no power to the wheels no matter how far down the gas pedal goes.

Most of the time the Check Engine light, VSC TRAC and VSC OFF lights are on, and the above issue doesn't manifest. So obviously it's something to do with that, but I can't find a code or source of the problem. Any ideas?
The traction control on these are horrible offroad. Good on ice but in mud or deep snow the truck will lose all power til you pretty much stop. It's hitting the brakes trying to get traction and robs all power.

Disable that crap.
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Old 03-03-2017, 10:10 AM #4
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Quote:
Originally Posted by JayRolla View Post
The traction control on these are horrible offroad. Good on ice but in mud or deep snow the truck will lose all power til you pretty much stop. It's hitting the brakes trying to get traction and robs all power.

Disable that crap.
Under what circumstances did you experience actual dethrottling? The VSC should be the only system that can cut engine power, and the VSC should be disabled with the cenfer diff locked.
Last edited by Lindenwood; 03-03-2017 at 10:41 AM.
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Old 03-03-2017, 10:16 AM #5
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I'm just here so i can start a thread.
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Old 03-08-2017, 01:34 AM #6
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Quote:
Originally Posted by Lindenwood View Post
Under what circumstances did you experience actual dethrottling? The VSC should be the only system that can cut engine power, and the VSC should be disabled with the cenfer diff locked.
Sorry for the delayed response. Working 13 hour shifts and all I do in between is sleep.

It happens under normal driving conditions, dry road, from a dead stop or sometimes if I'm trying to accelerate on the highway (if this happens I go from 60 to 40 before I can fix it - people behind me love this).
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Old 03-08-2017, 01:36 AM #7
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Quote:
Originally Posted by eddiemoneyT4R View Post
start a thread.
I do not think that means what you think it means
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Old 03-08-2017, 01:53 AM #8
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Quote:
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I do not think that means what you think it means
LOL

He's just upping his post count, have to have 10 or 20 or something before you can start threads.

VSC on my 2002 anyway beeps when it activates. Do you hear beeping when you lose power?
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Old 03-08-2017, 06:06 AM #9
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Quote:
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...
It happens under normal driving conditions, dry road, from a dead stop or sometimes if I'm trying to accelerate on the highway....
This is not at all the correct situation for VSC to activate. It is caused when one wheel is not rotating at the same speed as the others such as when going around a bend on loose soil at speed and the rear end begins to slide out, then it kicks it. Ask me how I know. There is something wrong here, like maybe a speed sensor on one or more of the wheels. I'd check the ohm specs on those. Luck.
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Old 03-08-2017, 10:51 AM #10
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Quote:
Originally Posted by WallyWest View Post
VSC on my 2002 anyway beeps when it activates. Do you hear beeping when you lose power?
No beeping like you normally get with VSC, a completely silent dead zone. I'm wondering if it's a wheel speed sensor?
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Old 03-08-2017, 10:53 AM #11
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Quote:
Originally Posted by jgue467 View Post
This is not at all the correct situation for VSC to activate. It is caused when one wheel is not rotating at the same speed as the others such as when going around a bend on loose soil at speed and the rear end begins to slide out, then it kicks it. Ask me how I know. There is something wrong here, like maybe a speed sensor on one or more of the wheels. I'd check the ohm specs on those. Luck.
Yeah I think a wheel speed sensor may be the culprit. But the thing is it ONLY happens when my VSC OFF light is NOT on, meaning when VSC is active. I think we can test the wheel speed with a scan tool my friend has. God, I just want to figure this out.
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