112 degree heat outside. Lost power and CEL went on.

[ADOR]

My h2 now have 37,600 miles. I always take it to Vegas. Some occasions, the temp is over 100 degrees. Yesterday, on the way back to Vegas, temp was running between 110-112 degrees. I have always driven the H2 with AC on all the time. Yesterday, just to be on the safe side, I turned it OFF right before we climbed that uphill place, right after CA/NV state line. Almost at the top, I felt that the truck was struggling, with slight jerking. Even as I step on the gas pedal, no power. It's like no gas is going, or it felt like it's "flooded". Pulled over. I turned off engine. The re-started. This time, CEL went ON. After waiting for an hour for AAA, the H2 is on the back of a flat bed truck. I will have it towed to a Cadillac dealership today and have them check the CEL. I hope it's nothing serious. Any guess what it could be?

 

[PCH2]

I grew up in Vegas and the only problem I ever had like that was Vapor Lock. My 2 cents worth. That was not on fuel injection though, could be mass air flow sensor??

 

[alrock]

What about the temp gauge? Did that ever get to the top of the gauge?

 

[ADOR]

The Engine Temp gauge did not went over the normal level (at 12 o'clock). The Tranny gauge remained at 200 degrees. I turned off the AC at the start of the climb. I already had a bad feeling at the start of the uphill climb. The tow truck driver also mentioned that "vapor lock". I just dropped of the H2 at the dealer 20 mins ago. I hope they don't call me for a bad news. I am also now thinking of doing the Coolant Exchange service and AC service. It's going to cost me over $500 just for those two, plus whatever the fix for the CEL.

 

[PCH2]

"Bakers Grade", notorious for ending many a engines back in the day!!! We always hated seeing the sign to Zzyzx cause that meant the "Grade" was coming!! Hopefully nothing to serious. Good Luck.

 

[ADOR]

Tow truck driver said "place is called Baker because it bakes engines".

 

[ADOR]

Techs are still checking. They gave me these codes: P0174, P0171 and P0300 (misfire). They asked me if I ran the truck on an almost empty tank. Nope. I filled up in Henderson, NV. Then drove about 40-50 miles when this happened.

 

[PCH2]

Could be just the MAFS dirty?

 

[Mr_Rich]

When you're running your truck that hard just shortly after filling up I'd suspect something in the fuel was bad. I usually fill up in Ventura on my trips between LA and SB and one night I barely made it up the Conejo Grade in my K1500 after filling up in Ventura. The first two codes you cited don't necessarily worry me. I get those intermittently in my Firebird that I replaced the LS1 with an LS6. I think it has more to do with the computer calibration for the LS1 vs. the LS6 in my case. Those codes seem to vary depending on the outside temps and gas blends, IMO. I think your truck has low miles to be showing any kind of serious problem. I hope the dealer doesn't take you for a ride....

 

[ADOR]

Service advisor called. Tech said #1 It maybe a leak on the vacuum hose or #2 I may have filled up with contaminated gasoline. Either way, the tech will clear the error codes and will have to re-start engine from cold start. If the error codes don't come back, then that's it. If it comes back, then they will check the vacuum hoses for leaks. How about if it was bad gasoline? If they start the truck with the same bad gasoline, won't that trigger the same codes? Should the gas tank be drained? Damn! I still have about 3/4 tank of gas.

 

[Mr_Rich]

It's likely that your truck will be okay here in LA and you won't duplicate those conditions that led to the problem on the Baker Grade. At most you could add some fuel system cleaner and go for an easy cruise down the highway.

Sent from my BlackBerry 9810 using Tapatalk

 

[Zach]

If it was bad gas, they will need to drain the tank. My truck hates that hill.

 

[PCH2]

Update ADOR, you make it home okay?

sent from within the "Cone of Silence" at Control Headquarters, that can only be reached in a Hummer.

 

[ADOR]

The H2 is still at the Cadillac shop. The tech cleared the codes last Friday, nut had to re-start the engine from "cold start", whatever that meant. They will check if the codes re-appear. If it does, they will check the vacuum hoses. I also asked them to drain the gas tank. Advisor told me she will check with the tech.