BadPunkin

Hoping to get a little insight into an ongoing stalling problem.

Specs -

2007 Burb 2500 LT loaded, 71,500 miles, Vin - 7G175017

History -

5 weeks ago while towing a trailer weighing approximately 9K for more than 180 miles, the truck stalled at 60 MPH on the interstate in tow mode. Fuel gauge read less than 1/4, DTE was 28. The truck would not restart until I put a gallon of gas in it and then proceeded to fill at the station to full. I assume this was a "margin of error" situation and simply ran out of gas

No issues for the next 5 weeks and 2K miles, but I did not let it go below 1/3 tank to be safe and did not do any towing over 30 miles and only light weight when I did.

2 days ago I was pulling an empty, under 3K# trailer over the continental divide in Colorado and the truck stalled twice. I was able to restart and continue until it finally stalled a third time. It started, but would not drive (ie pedal to the floor no change in rpms). I was in tow mode, trans temp was running hotter 209 F and fuel was above 1/4 and I was on a significant uphill grade. I had to roll backwards along a significant drop off into a blind corner to get to a parking lot. I let the truck idle, hood open until Trans temp was 165 F. Drove the rest of the way home without stalling. However, tarns temp continued to read very high, 180-190 downhill and in town, even after sitting for 10 minutes with the hood open.

I have towed and driven this truck in all sorts of conditions and never had a trans temp above 178 F. If it was simply the 12,000 ft of elevation and the temp is fine and unrelated to the stalling I can live with that, I only mentioned it because it was unusual for this truck. But why is it stalling, and in terrible places none the less?

I took it to the dealer and there are no codes, no lights have ever come on, and they can not explain what happened.

I have to drive 1300+ miles Sunday with the 3K# trailer and the whole family (2 kids, wife and 2 dogs) and don't want to be stuck in BFE.

Questions -

1. Assuming the first time I simply ran out of fuel, what caused the 2nd incident? Trans Temp? Fuel pump dry due to incline? Limp mode?

2. Could trans temp be causing the stalling, both times?

3. Could a bad fuel pump/sensor be the culprit?

Thanks in advance for any help, I am at a loss on how to proceed and this last trip put us over the mileage for the warranty so ***** nilly replacing things is out of the question (I am already into this truck for $4K this month)

BP

BadPunkin

The only applicable info I found while searching was this -



From this post

73shark

Welcome to the forum.

You mentioned spending $4K. Would be helpful to know what has been done. It's been my experience that fixing some problems causes others.

BadPunkin

Thanks, been lurking for awhile.

Recent work, all preformed at the dealership-

New cooler line
New front BJs
Backup camera module replaced
New tires
New driver hub bearing
New front routers
Alignment
Oil change

Thats what I can remember off the top of my head. All recalls are up to date. Doesn't seem like anything that would cause overheating or stalling

Thanks

BP

Joe In NY

if you have a clutch fan, ditch it for 2 electrics. They move a ton of air and are a smaller load than a big clutch fan on the motor...

But how the hell is gm aware of this and not doing a damn thing or getting sued for not doing anything???

73shark

Two things that can cause overheating are bad thermostat and debris in front of radiator.

As far as the stalling/running out of gas goes, could be fuel pump starting to go Tango Uniform.

What cooler line was replaced and why?

What's a truck related BJ?

Where's it said that GM knows about it?

BadPunkin

Trans cooler line, due to small leak. A common problem on the 6.0L as I have been told.

Ball joints = BJs

Would a bad thermostat throw a code? It was hot enough to turn off the AC automatically on several occasions, so the computer is addressing some perceived issue.

BadPunkin

That is one of the upgrades I am considering. Right now I am trying to decide if i should cut my losses and trade in for a 13' 2500 or try to stick it out. We have a longer trip planned towing 7-8K#s in August through the hills of PA and I am not sure I want to risk another round of stalling with the whole family in tow. If there was a code or the dealer found something and replaced anything I might feel better about it not happening again. As it stands now they can't even determine what the problem is, not very re-assuring.

Thanks

BP

73shark

Don't you already have two electrics? Thought the GMT900s all had them.

BadPunkin

Looks like it is a dual tank pump issue on the 2500s.

RV.Net Open Roads Forum: Tow Vehicles: towing trouble 07 3/4 ton suburban

found 5 more posts from different people all 2007-2008 Suburban 2500s stalling after towing and around 1/4 tank. Unfortunately, no resolution except don't get below 2/3 which makes the 39 gallon tank useless.

If anyone has resolved this issue let me know,

Thanks everyone

BP