Shifting issue
JK Super Freak
Joined: Jul 2008
Posts: 1,944
Likes: 6
From: bay area, ca
When checking the Trans fluid, in addition to the level, also make note of the color and smell. sometimes it helps to drip some of the fluid on a white piece of paper to see what the current color is. Usually red when new getting brownish over time. It should never be black. A burnt smell will be an indicator of overheating also.
Old or burnt transmission fluid can cause slipping and otherwise flaky operation of the transmission
If you have not had the Transmission Recall performed yet, have them pull the codes before they reset the computer with the changes. Apparently (thanks to spartan) they have removed the overheating codes (that did no good without a visual indicator) and replaced it with the 'HOT OIL' visual indicator. (that is no good for traceability/troubleshooting)
I would suggest that anyone that encounters the new 'HOT OIL' warning take a picture of the instrument panel making sure that the odometer is selected, and not one of the trip odometers so that mileage is indicated.
good luck
Old or burnt transmission fluid can cause slipping and otherwise flaky operation of the transmission
If you have not had the Transmission Recall performed yet, have them pull the codes before they reset the computer with the changes. Apparently (thanks to spartan) they have removed the overheating codes (that did no good without a visual indicator) and replaced it with the 'HOT OIL' visual indicator. (that is no good for traceability/troubleshooting)
I would suggest that anyone that encounters the new 'HOT OIL' warning take a picture of the instrument panel making sure that the odometer is selected, and not one of the trip odometers so that mileage is indicated.
good luck
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
My guess is the "Hot Oil" warning comes on before the transmission goes into overheat shift schedule.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
Thread Starter
JK Newbie
Joined: May 2010
Posts: 61
Likes: 0
From: Collegeport, Texas
havent had it installed sorry.. i figure its pointless to put a band-aid on as a fix ill just put on the trans cooler here pretty soon... ill take it to my buddy this weekend and get him to give it a once over and see whats going on. keep the insight coming though we may stumble onto something here.
Thread Starter
JK Newbie
Joined: May 2010
Posts: 61
Likes: 0
From: Collegeport, Texas
Fluid level is nice and good with a pretty red color. Cranked her up after work worked fine cranked her back up this morning still working fine didn't reset the battery or anything.. Guess she was just getting used to this cool weather again after so many hot months here in south Texas. That or was trying to tell me I should have taken the day off 
JK Super Freak
Joined: Jul 2008
Posts: 1,944
Likes: 6
From: bay area, ca
My guess is the "Hot Oil" warning comes on before the transmission goes into overheat shift schedule.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
Here's the issue I have: Why is it that ronjenx has the answers and insight on this confusing matter, but neither the service manager nor the customer service rep have the answers?! Why is it that not only did they not have the answers, but they were trying to charge me for this? If they knew their product, they could've given the information that ronjenx has.
Well done ronjenx!
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
spartan99,
Can you get your hands on an infrared temp gun?
If you can, next time you get the hot oil light, take a reading off the transmission pan. I have found that to be pretty close to what my transmission temp gauge reads.
That would tell us for sure if the warning comes on before an actual over-temperature condition exists.
Can you get your hands on an infrared temp gun?
If you can, next time you get the hot oil light, take a reading off the transmission pan. I have found that to be pretty close to what my transmission temp gauge reads.
That would tell us for sure if the warning comes on before an actual over-temperature condition exists.
JK Super Freak
Joined: Jul 2008
Posts: 1,944
Likes: 6
From: bay area, ca
spartan99,
Can you get your hands on an infrared temp gun?
If you can, next time you get the hot oil light, take a reading off the transmission pan. I have found that to be pretty close to what my transmission temp gauge reads.
That would tell us for sure if the warning comes on before an actual over-temperature condition exists.
Can you get your hands on an infrared temp gun?
If you can, next time you get the hot oil light, take a reading off the transmission pan. I have found that to be pretty close to what my transmission temp gauge reads.
That would tell us for sure if the warning comes on before an actual over-temperature condition exists.
No, but I'll certainly install a temp gauge so I'll just go by that.
Thread Starter
JK Newbie
Joined: May 2010
Posts: 61
Likes: 0
From: Collegeport, Texas
im just curious if synthetic trans fluid would have a cooler running temp than then factory fluid..? im about to change mine to full synthetic when i finally reach 30k. im already running mobil 1 full synthetic in my motor and differentials. i havent had mine overheat or the light come on. just a curious thought
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
im just curious if synthetic trans fluid would have a cooler running temp than then factory fluid..? im about to change mine to full synthetic when i finally reach 30k. im already running mobil 1 full synthetic in my motor and differentials. i havent had mine overheat or the light come on. just a curious thought
Anything labeled ATF+4® is synthetic.
JK Freak
Joined: Jun 2008
Posts: 663
Likes: 0
From: Plano, Tx
My guess is the "Hot Oil" warning comes on before the transmission goes into overheat shift schedule.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
The code P0218, will not be set until an Overheat shift schedule is activated, when the Transmission Oil Temperature reaches 240° F.
When the transmission goes into an overheat shift schedule, the driver will see it as a difference in transmission behavior.
If the notice is supposed to serve as a warning to prevent getting to the next heat level that throws the code, it should also throw a 'Hot Oil' code as well for traceability.
As a manufacturer or dealer, ( I am not ) I would want this because if I see the hot oil codes and the true overheating codes I know that the customer is ignoring warnings and that may have led to early failure. As a customer It gives us proof that our transmission is living on the edge too often and gives us leverage with the dealership for a free transmission cooler upgrade.
I think that they should come up with a more meaningful message than 'Hot Oil', the first thing that I checked was my motor oil.
Last edited by cppower; Sep 30, 2010 at 11:06 AM.