GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 2 of 13 FirstFirst 123412 ... Last Post byLast Post by
Results 11 to 20 of 122
  1. #11


    About 2 weeks ago my '07 Tahoe LTZ (95000+ Miles) experienced the same issue.
    The Situation (along with a fist pump):
    - Driving along normally, not doing anything out of the ordinary, when the engine begins with a short RPM increase, followed by a quick decrease of about 1,000 RPMs, followed by the following warning indications in this order in about 3 second intervals: Stabilitrak Disabled, Traction Control Disabled, Service Stabilitrak, Reduced Engine Power, Engine shook like a '57 Chevy. The engine then stalls out. It is was triggered by a sudden stop or decrease in speed. I took a video of the error the third time that it occurred will try to post.

    Shop Trips:
    1) Tune Up, 30-Point Inspection, Software Update; etc. - 7 Days Later SOS

    2) Replace Sensors - Next Day SOS

    3) Replace Throttle Body - Picking it up today so we will see

    - Keeping my fingers crossed!

  2. #12


    My 2009 Tahoe LTZ with 19k miles is having the same problems....I took it in for service a couple of weeks ago and they said that my error codes was p0175 and p0172 (Rich fuel) and the dealer was telling me that I put e85 gas in it when I know I didn't. My truck has this vibrating sound thats coming from the top of my engine when decelerating ( around 1k rpm) and sometimes at it will make that noise in idle. My idle is very erratic but dealership says that's normal. Last night the truck didn't drive right...felt like it had a bog during acceleration then all of a sudden the stabilitrack/engine power reduced error came on. Going to the dealership again later you guys think I have a bad throttle body too?


  3. #13


    My 2009 Suburban LTZ is having the same exact problem with Service Stabilitrak message and the engine shutting off. Trying to get it serviced before anyone gets injured. Very, very dangerous if you are going to be driving on the highway. Will post with resolution.

  4. #14


    Mjs84 Have you had anymore problems since replacing the throttle body?

  5. #15


    Quote Originally Posted by Dave D. View Post
    Hopefully that was all under warranty. Don't know why no one tests anything these days. Guess at $90 bucks an hour, best to put in new parts. I always service the throttle body every couple of years. They get gummed up like the carbs used too. Especially the Idle air control passages.
    Having spent some time working with the guys who specialize in diagnostics at my local dealer, I can tell you that they don't test things because they cant afford to. When GM determines the amount of time it will take to fix a problem, they don't account for getting the required tools, or going to the parts department to get parts, fluids, etc. The result is that the service time on warranty work is almost always shorter than the time the mechanic will spend working on it. Because GM only assigns so much time, they only pay so much time. Anything over GM's specified time, and the mechanic will either be working for free or they will have to go the the service manager and request additional time, which ends up being paid by the dealer rather than by GM. Since there really is no extra time to test parts too thoroughly on warranty vehicles, the mechanic just has to follow what the GM service information tells them to do or else they won't make money.

    That being said, there seem to be a few possible causes for this set of symptoms - the throttle body issues mentioned in this thread, computer issues, and I have personally seen the computer activate this same safety mode for a misfire caused by a loose wiring connector on an ignition coil.

    2008 FORD F350. My new all-around truck.
    2001 Silverado Reg. Cab Not-So-Base -- SOLD
    2003 Avalanche Z71. No Cladding. Check out my Mod thread. - Crashed. Will be rebuilt soon.
    1974 Triumph Spitfire 1500 - Work in Progress
    2003 Sierra 3500 Duramax. The Newer, Better Work Truck -- FOR SALE

  6. #16


    its been forever since i posted on the site, but when i saw this email i thought i'd chime in.

    my problem ended up being that my intake wasn't on all the way. I had to put in a new set of hids and i took the intake off and i didnt get it on all the way and it actually came disconnected from the intake manifold (oops). popped the hood and it was hanging from the air box. so it actually saved my engine from damaging, unfiltered air.

    so a possible solution, and to maybe save a trip from the dealer, check the intake path and make sure everything is connected properly

    2007 Silverado Crew Cab
    5.3 L Vortec V8
    LT1 Package
    Driver Information Center (from
    Volant Cold Air Intake
    6000k HID DDMTuning Kit
    LED tailgate bar 3rd brake light
    LED lights for foot wells
    LED Side Bars
    LED Headlight Accents
    Husky Mud Guards

  7. #17


    Just one more thing I thought of for anyone who might be having this problem - the 2007+ trucks have the ability to detect the percentage of ethanol in the fuel that has been put into them. At the time I was working at the GM dealer, 5% was the highest that was normal here, but we worked on a few trucks that came in with these issues that when we hooked up the Tech2, they showed around 35% ethanol. I think what happens in that case is that the engine changes its timing to be compatible with ethanol fuels (to make the FlexFuel engines run better on e85 and such) but since the fuel is still normal, it doesn't run properly. When the computer detects this improper running, it goes into limp mode. A reset of the ethanol % using the Tech2 always fixed this problem and only took a few minutes.

  8. #18


    I'm having this problem for about the 10th time. My dealer says its either my oiled air filter messing up the MAF. Or flooded streets makin me throw a throttle position sensor code. Any ideas what do to. I've reset my truck and tried using my iTune to clear the codes. Not sure what I need to look at first
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  9. #19


    has anyone actually found the root cause of this. this is driving me nuts.

    i just finished replacing the whole throttle body and no change.

    i have a 2007 silverado 5.3l flex

  10. #20


    Quote Originally Posted by skp_sr View Post
    has anyone actually found the root cause of this. this is driving me nuts.

    i just finished replacing the whole throttle body and no change.

    i have a 2007 silverado 5.3l flex
    i had this problem and it was from the water getting into my sill guard. Underneath that is the IP to body harness. Water gets into the connections and causes the throttle positioning sensors to read different causes the truck to go into a protection mode. The streets n Tuscaloosa flood like crazy when it rains. To fix it you gotta find where the water is getting in seal it up and put so electric grease in the connection. Since I have done this I haven't had any problems.
    The dealer in town tried to tell me in was my kn intake so I pulled it off and put the stock one on and went back up there to show it wasn't the problem. Eventually I found some research on the Internet with a work order number. Ended up doing it myself though

Similar Threads

  1. Reduced engine power help
    By NHRASST1974 in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 05-10-2010, 12:41 PM
  2. service stabilitrak after lift blocks in back
    By fornik8her in forum Lifted & Offroad Suspension
    Replies: 2
    Last: 02-26-2010, 04:51 PM
  3. Reduced engine power
    By stuntworks in forum GM Powertrain
    Replies: 2
    Last: 01-11-2010, 07:56 AM
  4. reduced engine power
    By millerahf in forum GM Powertrain
    Replies: 5
    Last: 06-02-2009, 12:28 PM
  5. reduced engine power
    By bisskits in forum The Coffee Shop ~ Chit Chat
    Replies: 1
    Last: 09-29-2008, 08:54 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts