2013 GMC Terrain poor gas mileage after transfer replacement - EquinoxForum.net: Chevy Equinox Forum
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post #1 of 11 (permalink) Old 05-03-2017, 08:09 PM Thread Starter
ITM
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2013 GMC Terrain poor gas mileage after transfer replacement

2013 AWD 4 cyl. Last fall The transfer case had to be replaced under warranty. It started making strange noises and on the way to the dealer something let loose inside and every so often there was a loud "clunk" which would jolt the whole vehicle. Obviously something inside the transfer case broke and ended up cracking the transfer case. After the new transfer case was replaced I noticed a significant decrease in the gas mileage. Used to get 23 - 24mpg combined and 27 - 28mpg highway. After the replacement of the transfer case I get 19.5 - 20.5mpg combined and at best 22.5mpg highway. I didn't call the dealer last fall because the weather got cold and I thought that could be the reason. It never improved through the winter. The weather is warm now but the mileage still is poor. I also noticed when using the cruise control on the highway the transmission is downshifting on the slightest incline. It seems like something is making the engine work harder now. Just took it to the dealer today. They checked for any error codes and found none. They inspected the drive train and couldn't find anything wrong. They said there is nothing they can find that could be causing the issue. Any one have this happen after a transfer case replacement? Any ideas on the possible cause(s)?
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post #2 of 11 (permalink) Old 05-03-2017, 11:06 PM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

The new transfer case may not be the cause.
"Jolt the whole vehicle"
Previous transfer case may have damaged something else.

Also, it could just be coincidental and something unrelated could have started acting up. I e

Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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post #3 of 11 (permalink) Old 05-04-2017, 10:06 AM Thread Starter
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Jeff, that's what I'm thinking as well. The jolt had to have done something bad in the rest of the drive train or engine but the dealer said they didn't see anything else wrong during the replacement. Not sure where to turn now. Maybe call GM. It is still within the 100k power train warranty.
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post #4 of 11 (permalink) Old 05-04-2017, 11:06 AM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Quote:
Originally Posted by ITM
but the dealer said they didn't see anything else wrong during the replacement.
Oh really, amazing what they can see without ever having to open up the transmission or differential.

Talk to a different dealer and possibly try GM.




Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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post #5 of 11 (permalink) Old 05-04-2017, 01:24 PM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

interesting little article on this

https://www.yourmechanic.com/article...put-shaft-seal

You can check your own transfer case and differential oil level by opening up the side/fill plug and sticking your little pinky finger or something narrow (that you won't lose) inside. fluid level should be at the bottom of the fill hole.
Do the same for the transmission fluid . (no dipstick for transmission )

How many miles on the car?
Ever changed the transmission fluid and/or differential fluid?

I changed all 3 at 60,000 miles and all 3 needed it pretty bad. transfer case and differential were really bad.

Hopefully they filled the new transfer case to full.

Again, it could be something else that just happened to start causing problems at the same time.
Or even the possibility that the shock could have reached the engine ( I doubt)

I have oil consumption and it does not have the power it should have. Sometimes, it will not shift to 6th gear at higher speeds because of it.


Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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post #6 of 11 (permalink) Old 05-04-2017, 05:59 PM Thread Starter
ITM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

73,000 miles. Transmission fluid changed when transfer case replaced. Differrential oil not changed.
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post #7 of 11 (permalink) Old 05-04-2017, 06:08 PM Thread Starter
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Another interesting tidbit I forgot about. When I got the vehicle home after the replacement. There was a pool of oil on the garage floor the next morning. I took it back and apparently the valve cover gasket began leaking out of the blue. Had to get replaced as well. Too coincidental.
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post #8 of 11 (permalink) Old 05-04-2017, 06:59 PM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Quote:
Originally Posted by ITM
Another interesting tidbit I forgot about. When I got the vehicle home after the replacement. There was a pool of oil on the garage floor the next morning. I took it back and apparently the vdalve cover gasket began leaking out of the blue. Had to get replaced as well. Too coincidental.
Ah, yea. Too coincidental.
How often do you check your oil?

Jeff from Iowa, Purchased 2011 Nox in Nov. 2016, Manufacture date 10-10, 2.4l, AWD
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post #9 of 11 (permalink) Old 05-04-2017, 08:10 PM Thread Starter
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Probably do not check the oil as often as I should but no issues thus far.
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post #10 of 11 (permalink) Old 05-05-2017, 03:08 PM
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Re: 2013 GMC Terrain poor gas mileage after transfer replacement

Quote:
Originally Posted by ITM
2013 AWD 4 cyl. Last fall The transfer case had to be replaced under warranty. It started making strange noises and on the way to the dealer something let loose inside and every so often there was a loud "clunk" which would jolt the whole vehicle. Obviously something inside the transfer case broke and ended up cracking the transfer case. After the new transfer case was replaced I noticed a significant decrease in the gas mileage. Used to get 23 - 24mpg combined and 27 - 28mpg highway. After the replacement of the transfer case I get 19.5 - 20.5mpg combined and at best 22.5mpg highway. I didn't call the dealer last fall because the weather got cold and I thought that could be the reason. It never improved through the winter. The weather is warm now but the mileage still is poor. I also noticed when using the cruise control on the highway the transmission is downshifting on the slightest incline. It seems like something is making the engine work harder now. Just took it to the dealer today. They checked for any error codes and found none. They inspected the drive train and couldn't find anything wrong. They said there is nothing they can find that could be causing the issue. Any one have this happen after a transfer case replacement? Any ideas on the possible cause(s)?
Flip the ECO switch when on the highway, shouldn't downshift as often.
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