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  1. #1
    Join Date
    May 2017
    Location
    southern california
    Posts
    4

    Red face Altitude pressure sensor

    Hello: I'm new to this forum, so forgive me if I'm in the wrong place. I have an 07 Chev 6.6 TD Duramax/Allison. I've had trouble in the past when going up high altitudes. The engine light comes on and stays on for quite awhile. After which, it goes off without coming on again. How ever Last year, It went on and the truck lost power and went into some kind of mode that would only let me go about 10 miles an hour. I was pulling my 5er so I pulled over, called On-Star and they told to me to turn the engine off and wait a few minutes. I did and sure enough the light went off and I continued my trip. When I got back, I took it to the dealer and they replace some sort of sensor. I hadn't taken the truck up any high places until a couple months ago, and then the light came on again but the truck ran fine. Got to the campground and the next morning the light was off and it never came on again. So my question is: Has this ever happened to anyone else? Should I take it back to the dealer. I there something else that can cause this problem? We're planning a trip up to Yellowstone in summer and I know i"ll be climbing some mountains, so I want to make sure I'm ok.
    Thanks in advance for your help
    Manny

  2. #2
    Join Date
    Jan 2001
    Location
    Knoxville,Tennessee
    Posts
    2,639

    Default

    Welcome to TDP

    Sounds like your running up and down Hwy 395. Nice grade climbing north out of Bishop.

    Have you pulled the codes to see what the problem is?

    Either a good code scanner or a trip to parts store to see if they can read them. Get those and come back I bet you will get lots of help here.
    "The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government."
    -Patrick Henry


    A5150nut
    2006 K3500 D/A
    94 6.5 4x4 5spd Sold

  3. #3
    Join Date
    May 2017
    Location
    southern california
    Posts
    4

    Default Altitude sensor

    Yep, got that right. up the 395 seems to happen right after I stop for fuel in Pearsonville. I guess the incline starts about there..I'll give your suggestion a try and get back to you.
    thanks a lot
    Manny

  4. #4
    Join Date
    Apr 2004
    Location
    Bar Nunn, WY
    Posts
    193

    Default

    The atmospheric pressure sensor is on the side of the ECM. You could look and make sure it's not blocked with something preventing the ECM from seeing pressure changes. If it's bad I would think you would need to replace the ECM to fix it.

    Jay
    2023 Tahoe 3.0l diesel
    2013 Harley Switchback
    2021 Ram 2500 6.7l (sold)
    2018 Chevy Traverse (sold)
    2021 Silverado 3.0l LM2 (sold)
    2019 GMC Sierra 6.2l (sold)
    2019 Colorado ZR2(sold)
    2017 2500HD CC D/A (sold)
    2015 1500 CC High Country 6.2l (sold)
    2010 Chev 2500HD CC D/A (sold)
    2013 Chev 2500HD CC D/A (sold)
    2006 Chev 3500 CC D/A (sold)
    2005 Harley Ultra Classic (sold)

  5. #5
    Join Date
    May 2017
    Location
    southern california
    Posts
    4

    Default Ecm

    OK... NOW...what's an ECM?

  6. #6
    Join Date
    Apr 2004
    Location
    Bar Nunn, WY
    Posts
    193

    Default

    The computer for the engine. Engine Control Module

    Jay
    2023 Tahoe 3.0l diesel
    2013 Harley Switchback
    2021 Ram 2500 6.7l (sold)
    2018 Chevy Traverse (sold)
    2021 Silverado 3.0l LM2 (sold)
    2019 GMC Sierra 6.2l (sold)
    2019 Colorado ZR2(sold)
    2017 2500HD CC D/A (sold)
    2015 1500 CC High Country 6.2l (sold)
    2010 Chev 2500HD CC D/A (sold)
    2013 Chev 2500HD CC D/A (sold)
    2006 Chev 3500 CC D/A (sold)
    2005 Harley Ultra Classic (sold)

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