Truck stalling

Pointerman · October 7, 2005

I need some help trouble shooting my problem. My truck seems to be stalling at random times. Driving steady down the freeway and all of a sudden it dies. No sputter, warning or anything. It won't restart without resetting the alarm and shutting it off again. Is this likely some sort of short in the alarm system, a fuel delivery issue or what? What tests can I do to try to avoid a trick to the dealer and a really expensive repair bill. 2500HD with 8.1 and allison. 2002

bobcat5544 · October 7, 2005

is your vehicle stock

GM-Tech · October 7, 2005

Crank position sensor.

bobcat5544 · October 7, 2005

Crank position sensor.

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how did you come up with that. I agree that it is a posiblity, but with the info he gave how did you figure it is the cps.

496 CUBIC INCHES · October 7, 2005

Crank position sensor.

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how did you come up with that. I agree that it is a posiblity, but with the info he gave how did you figure it is the cps.

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Because its fairly common on the 8.1s and thats exactly what happens when the CPS goes bad.

bobcat5544 · October 7, 2005

Crank position sensor.

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how did you come up with that. I agree that it is a posiblity, but with the info he gave how did you figure it is the cps.

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Because its fairly common on the 8.1s and thats exactly what happens when the CPS goes bad.

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I know its common, but it doesn't explain why "It won't restart without resetting the alarm and shutting it off again." as he states

GM-Tech · October 7, 2005

I know its common, but it doesn't explain why "It won't restart without resetting the alarm and shutting it off again." as he states

As mentioned, it's VERY common. I ignored the alarm comment because alarms don't cause a vehicle to stall. Not start maybe, but once it's running, they can't shut off the engine. Unless he has the 1 in 10,000 aftermarket alarms that kill the ignition, which I seriously doubt.

drumset5994 · October 7, 2005

Crank position sensor.

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how did you come up with that. I agree that it is a posiblity, but with the info he gave how did you figure it is the cps.

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Reason: GM Guy = God

Pointerman · October 7, 2005

is your vehicle stock

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100%

Pointerman · October 7, 2005

Alarm is factory. Truck will not restart without the alarm being reset. A whole lot of fun putting the truck in neutral and playing with the key fob while coasting on the freeway.

Truck will not start at all sometimes while still in the driveway without fiddling with the alarm a few times.

If this is the "CPS" is that something your average (OK, so I'm actually way below average) weekend mechanic can fix on his own? Is this covered in your standard Chiltons manual?

bobcat5544 · October 7, 2005

If the only way you can get the vehicle to restart is by turning on and off the alarm then it is not the crank sensor. It is in the alarm system, eather ignition switch/lock cylinder (passlock) or the module.

bobcat5544 · October 7, 2005

Crank position sensor.

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how did you come up with that. I agree that it is a posiblity, but with the info he gave how did you figure it is the cps.

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Reason: GM Guy = God

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pointerman = useless

GM-Tech · October 7, 2005

pointerman = useless

What, exactly, is this supposed to mean?

bobcat5544 · October 7, 2005

Alarm is factory. Truck will not restart without the alarm being reset. A whole lot of fun putting the truck in neutral and playing with the key fob while coasting on the freeway.

Truck will not start at all sometimes while still in the driveway without fiddling with the alarm a few times.

If this is the "CPS" is that something your average (OK, so I'm actually way below average) weekend mechanic can fix on his own? Is this covered in your standard Chiltons manual?

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Try thinking before typing.

So just sit there, read, and let the grown ups handle thing from here