My LMM CCSB sat out friday night and saturday night in my drive way and both nights I belive it got down to at least 15 degrees. Not near as bad as a couple of weeks ago when the high was only maybe 15 and lows at night below zero degrees.
Well anyway I remote started it this mourning and let it run probably 8 min or so then went out to move it to the shed to hook up the ice fishing trailer and guess what?? No power steering and I didn't notice this untill after I put it in reverse and when I went to stop it wouldn't stop backing up till I had the brake peddle touching the floor, NO POWER BRAKES EITHER.
I thought WTF is going on with this stupid computer controlled truck now:mad:. I managed to drive it to the shed with no power steering or power brakes and that really sucked. I got it in the shed where I didn't much care at that point if I ever owned that truck again. I left it sit and run while I called my buddie and had to tell him we would have to take his ford fishing for the day :( ya that sucked. Well I got my fishing stuff out of my rig and in the trailer and thought I better move my piece of crap out of the way so my buddie could hook up to the trailer and low and behold when I got in everything was working fine. All together it ran for about 15 min before it started working properly. I checked the belt right away when this happend and everthing looked fine and no oil spots in the driveway either. Anybody have an issue like this or know what could have happened. I ended up taking my rig for the day just to see if it would act up again and it worked fine all day.
I know it was kinda cold out this mouring but nothing like a few weeks ago when I was using it in negative temps.

Did the p/s pump make any noise like high pitch sound?
P/s pump fld condition?

Well I was not outside when it started up but I was less that 15 feet away by the window in the house when she fired up and I could here nothing but normal engine noise when it started. When I went outside to get in there were no weid noises that I noticed. I checked the PS fuid level and it looked clean and to be full. The truck only has 16,000 miles on it. So far just another notch in the belt for a reason to bitch to my stealership. There has been several to many problems with this truck already (I think) since I bought it new. I have owned three previous dmax truck before this one and never had near the issues with them as I have had with this one. I think anybody that thought having so may diffrent computer controlled moduals on one truck should have there heads examined.

The brake booster is hydraulic so if there is a problem with the power steering pump, the booster doesn't work properly. My guess is the pressure relief valve is stuck.
Reference this thread: http://www.dieselplace.com/forum/showthread.php?t=287703

I had the same problem a couple of times a few weeks ago. There's a post about replacing the p/s fluid with synthetic. I haven't had a problem since.

http://www.dieselplace.com/forum/showthread.php?t=291212

Took the truck in to the the dealer yesterday and got a call last night saying they were going to have to put a new power steering pump on. Don't know if they found something obvious or not but when I know what is up I will repost. I think I must have made myself clear when I was talking to the service manager yesterday and he found some BS bulliten from GM saying this was a normal function when diveing at parking lot speeds and having little or no power steering with the brakes applied. I told him he was full of S**T and that was not what happened. I also told him if I would of been in a parrallel parking spot when this happened I would of backed right over the car or person behind me. After I told him this it seemed he was more attentive. I hate when they try and throw that normal function crap in your face when you come in for a problem.

The dealer tried to tell me that they had never heard of this problem before, so we got on TDP. After I searched and showed them at least 8 other trucks that had the problem, he later told me GM rep had called and said they had HEARD of another case, BS.

Ya at first he also said they have never heard of a problem like this either but I stopped him right in his tracks when I told him about 3 or 4 people replied to this post with same problems and their dealers took care of them. I tell ya what I am really getting tired of always trying to prove myself right before they believe their is an actuall problem.

I had the exact same problem. I had it all day and I called for towing. Then I decided to try rev up the engine to 2000 rpm for 10 seconds. Bingo, the power brake and steering is back. Of course I cancelled the towing.

I have not had this problem again but I would rev up the engine next time I have this issue.

I live in Maryland. So we have not had very cold temps lately.

My truck did the same thing a few weeks ago. I jumped in my truck to go away in the evening and no power steering or brakes. I finally turned the truck off and after a minute or so started it back up and everything was fine then. I need to take it to a dealer to have it checked out because I think I now have a little groaning noise in the power steering.


08 Chevy CCSB LTZ

I had the exact same problem and posted it on another post, but after searching thru this forum, found that instead of replacing the power steering pump or power assist boost, rev up the engine and that clears the dirt out of the check valve and allows the system to work. The using the procedures I found on search, I removed the return line and bled the system by pumping the brakes and turning the steering wheel from side to side. I added 3 qts of PS fluid while flushing but am confident it fixed the problem.

There is an inline filter available for the return line -see this thread
http://www.dieselplace.com/forum/showpost.php?p=3146892&postcount=5

Trailwhale

So with the dealer replacing the power steering pump may not fix the problem? Is maybe a little dirt in the system that is causing it to act up, I wonder? This has happened to me 3 times now. It happened this morning and the temperature was 19. The other times it did it the temperature was in the teens also. I need to get it down to the dealer.

I've had the exact thing happen to me a few weeks ago on a really really cold morning. I had started the truck with my remote start. Went to put it in reverse and coudln't steer and it was tough to stop. Got it stopped, put it in park and I heard it pop or break free when I revved the engine up. Then power steering was restored. I have driven it normall since then. There seems to be a correllation between the cold and the problem. Now I have power steering red oily fluid dripping out my front passenger side of the truck, the opposite side the power steering pump is located. Guess I'll have to get it in for service...

Sure sounds like the fluid is getting thick when cold, (the one dealers suggestion of replacing the fluid with synthetic would make sence) Then on initial start it cavitates & fills the pump with air. When you shut it off the fluid has warmed up slightly & now flows into the pump.

BTW, it is -34* here right now. too bad we ordered the warm weather from Canada post :)

The first time it happened to me, it was about 20 degrees. I let the truck run for about 20 minutes and still no steering or brakes, that is long enough for the fluid to warm up. Since I had already had the system flushed with synthetic fluid, dirty fluid was out as the problem. After I revved the motor up, the steering broke loose.

Ahh..yes! Gm's sh*tty, hydra-boost.

Sure sounds like the fluid is getting thick when cold, (the one dealers suggestion of replacing the fluid with synthetic would make sence) Then on initial start it cavitates & fills the pump with air. When you shut it off the fluid has warmed up slightly & now flows into the pump.

BTW, it is -34* here right now. too bad we ordered the warm weather from Canada post :)

Mine realy does it when its hot.....come to think of it.It does it all the time.

I had this happen on a cold night. I got on it alittle at a light and when i went to stop it was really hard. Went to pull in a parking lot that was hard too! I took the belt off to check the p/s pump. Pulled on the pulley and it pulled right out with about an inch of the shaft! THE SHAFT SNAPPED! I couldnt believe it. New pump was $85 took about an hour. Still it scared me at first!

after the tech checked mine out it was not making enough pressure at idle or at 2400 rpm. They have specs it needs to fall into when at idle and at 2400rpm and mine fell short during both tests. I do have question though. Why do some of you think there is dirt in the system on your power steering. My truck only has 15K on it and I got to belive there is no dirt in the system. The synthetic oil does sound like good idea though. I will have to ask the dealer when they replaced my pump if the filled the system with synthetic oil.

There is a bulletin about a growl/whine when applying the brakes after leaving highway speeds in hot weather. The fix is to replace the PS fluid with synthetic. I don't know if this applies to your truck, but I would mention it. I think they should do this anyway.