2012 2.4 Need to Change Tranny Fluid - TerrainForum.net: GMC Terrain Forum
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post #1 of 26 (permalink) Old 02-18-2018, 10:33 PM Thread Starter
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2012 2.4 Need to Change Tranny Fluid

Is there any good info for the tranny fluid change? Searching I have found very terrible info and no pictures. I found a couple sparce videos on youtube and it appears there is a side plug for how much to fill tranny along with some process of heating up the tranny fluid.

Does anyone have any pictures for the tranny fluid drain plug? Is it the little bolt under the tranny directly facing the ground? I have black plastic plug on top of tranny and assume this is the fill plug?

I guess I will have to upload a video on youtube after I do this.
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post #2 of 26 (permalink) Old 02-18-2018, 11:32 PM
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You have no dipstick, I believe, so you have to use the fill hole on the side. I would start by checking your current level first (because itís possible itís incorrect). You need the fluid at the proper temperature first : 85-95C (185-203F). The fluid expands as it heats up. Too hot, the fluid expands too much, and youíll underfill. Too cold, the fluid expands too little, and youíll overfill. Do you have a Scan Tool to read your transmission fluid temp, or is it displayed in the DIC on your Nox? If not, most people would just bring the engine temp up to the range and go with that, but thatís engine temp - not transmission fluid temp. Not sure how accurate that is.

The drain plug is a small-headed bolt on the bottom facing the ground. Looks to be near the center seam, about halfway down. Note the torque. Donít overtighten! Your oil level plug is on the side. The fluid should be right at the lip of the oil level hole when itís at proper temperature. If fluid pours out, itís overfilled. Iíd verify this first, then reinstall the level hole bolt, then drain out the bottom, then re-fill with whatever amount came out, using Dexron VI.
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post #3 of 26 (permalink) Old 02-19-2018, 07:37 AM
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To assure that you are getting the "exactly" correct amount of fluid, it is also important to have the vehicle parked on a level surface. If there isn't enough room for you to get under the vehicle, it may require jacking up both the front and rear of the car.

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post #4 of 26 (permalink) Old 02-19-2018, 08:27 AM
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Originally Posted by RIT333 View Post
To assure that you are getting the "exactly" correct amount of fluid, it is also important to have the vehicle parked on a level surface. If there isn't enough room for you to get under the vehicle, it may require jacking up both the front and rear of the car.
Or measure the amount drained and fill back with same amount. Did this on a 6T30 a few months ago and just jacked up the front, loosened the drain bolt, lowered the car, reached under and removed the drain bolt, let it drain till it stopped dripping. reinstalled drain bolt.

Then, put one quart back at a time filling the then empty quart with previously drained oil. I had some spare empty quart oil containers as well. Then just filled with the same amount. Afterwards, started the engine, went through PRNDM a few times stopping for the recommended 3 seconds in each position. Let engine run a bit and took it for a drive. Checked trans fluid temps on scan gauge and then verified fluid level on trans side port.

Don't know if you looked it up yet. . but the new 8,9, and 10 speed GM transmissions will NOT be easy to changed the fluid on. There is no easy to use fill or drain bolts. And,some of these newer transmissions are developing a "shudder" under low load, steady speeeds. Seems the transmission torque converter clutch or TCC, doesn't like the fluid and needs a triple drain/fill from the dealer. The oil pan has to be removed each time!

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post #5 of 26 (permalink) Old 02-19-2018, 08:41 AM
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Originally Posted by JayTee2014 View Post
Don't know if you looked it up yet. . but the new 8,9, and 10 speed GM transmissions will NOT be easy to changed the fluid on. There is no easy to use fill or drain bolts. And,some of these newer transmissions are developing a "shudder" under low load, steady speeeds. Seems the transmission torque converter clutch or TCC, doesn't like the fluid and needs a triple drain/fill from the dealer. The oil pan has to be removed each time!
No, I have the 6-speed. One of the reasons why I wanted the 6-speed was I didn't want to debug a new transmission for GM without the salary.

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post #6 of 26 (permalink) Old 02-19-2018, 08:48 AM
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On my 2011 there is a dipstick. I'll try to get pictures tonight.

Its in the same location were you would fill the trans.
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post #7 of 26 (permalink) Old 02-19-2018, 08:50 AM
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No, I have the 6-speed. One of the reasons why I wanted the 6-speed was I didn't want to debug a new transmission for GM without the salary.
Yes. . I know you have the 6 speed. Was just stating this for those here who do not...

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post #8 of 26 (permalink) Old 02-19-2018, 08:56 AM
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Originally Posted by WVUTampaAlum View Post
Is there any good info for the tranny fluid change? Searching I have found very terrible info and no pictures. I found a couple sparce videos on youtube and it appears there is a side plug for how much to fill tranny along with some process of heating up the tranny fluid.

Does anyone have any pictures for the tranny fluid drain plug? Is it the little bolt under the tranny directly facing the ground? I have black plastic plug on top of tranny and assume this is the fill plug?

I guess I will have to upload a video on youtube after I do this.
Try these video. . same transmission fluid drain and fill procedure.




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Last edited by JayTee2014; 02-19-2018 at 08:59 AM.
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post #9 of 26 (permalink) Old 02-19-2018, 09:06 AM
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As far as the ďmeasure what comes out and put that same amount back inĒ method:

I do the same thing, but you *really* should determine if your *current* level is correct *before* you do that because if you donít your level may *never* be right!

How many transmission failures over the years were due (at least in part) to incorrect fluid levels? Had to be *some* of them...

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post #10 of 26 (permalink) Old 02-19-2018, 09:22 AM
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As far as the ďmeasure what comes out and put that same amount back inĒ method:

I do the same thing, but you *really* should determine if your *current* level is correct *before* you do that because if you donít your level may *never* be right!

How many transmission failures over the years were due (at least in part) to incorrect fluid levels? Had to be *some* of them...

True, but that is what the follow up warm up, drive, and check level port part of the procedure is for. Measure and refill is just the first part of getting near what should be the righr amount. Read the whole GM procedure or watch the entire videos. They pretty well cover what needs to be done.

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