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Old 08-17-2011, 01:05 PM   #1
bigapplephx
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Transmission Oil Temperature

JK Wrangler Rubicon,
At what temperature does the transmission hot oil light come on ??
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Old 08-17-2011, 01:10 PM   #2
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Never had the warning come on for mine, Aeroforce Interceptor gauge had it as high as 216 while towing. Normally around 150-170 highway, 195 in town.
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Old 08-17-2011, 01:11 PM   #3
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Need to get a cooler for towing. On the trails in 4LO it's rarely above 180, as low as 140 if there's deep enough water crossings.
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Old 08-17-2011, 01:52 PM   #4
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Originally Posted by Coley View Post
Need to get a cooler for towing. On the trails in 4LO it's rarely above 180, as low as 140 if there's deep enough water crossings.
4-low takes most of the load of the trans and should yield cooler trans temps. Load gets moved to the t-case and drive axles.
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Old 08-17-2011, 03:57 PM   #5
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I never had mine come on. I got an aeroforce to monitor it though. Freeway no hills maybe 165. Around town stop and go 185. I do have a cooler though installed before I got the aeroforce so no idea what I was running before.

Get the cooler and call it a day.
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Old 08-17-2011, 04:07 PM   #6
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Originally Posted by bigapplephx View Post
JK Wrangler Rubicon,
At what temperature does the transmission hot oil light come on ??
I searched and couldn't find a definitive answer. I know I've read it before somewhere.
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Old 08-17-2011, 04:30 PM   #7
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I'd be curious to know... I have had my trans temp up in the 240's range and no light. Then again I was trying to push in reverse my big assed E3 trailer up my driveway.... and YES I have a trans cooler. Even had the fan on. There just is not enough oil flow in reverse to keep it cool. I have seen smoke coming off the thing before so it makes me wonder if the trans flash even works with my early '07.

BTW. 240 used to be the high end of "normal" in older transmissions and 260+ was "HOT". So I do not know what the JK temp sensor trip is at which all of us are curious about.
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Old 08-17-2011, 04:40 PM   #8
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I don't know when the light goes on either, but...

The computer considers the transmission to be overheated above 240F,
and super-overheated above 260F.

jocrazy0,
Did you say you got the trans temp warning recall done on your "07?
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Old 08-17-2011, 04:51 PM   #9
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B&M transmission cooler. Cheap, easy install.

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Old 08-17-2011, 05:22 PM   #10
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Originally Posted by ronjenx View Post
I don't know when the light goes on either, but...

The computer considers the transmission to be overheated above 240F,
and super-overheated above 260F.

jocrazy0,
Did you say you got the trans temp warning recall done on your "07?
As far as I can determine yes. I received the overheat recall notice and took it in IIRC, I have taken it in for every recall. I find three sheets for transmission work where a "flash" was performed but I cannot identify specifically which one was for the overheat. That was a long time back, again IIRC.
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Old 08-17-2011, 05:35 PM   #11
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As far as I can determine yes. I received the overheat recall notice and took it in IIRC, I have taken it in for every recall. I find three sheets for transmission work where a "flash" was performed but I cannot identify specifically which one was for the overheat. That was a long time back, again IIRC.
Lots of people with '07's said they didn't get the temp warning recall, so I was thinking they wouldn't do it on an '07.
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Old 08-18-2011, 10:14 AM   #12
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Oh goody! Yet *ANOTHER* transmission hot oil thread. This should be fun. (where's the eating-popcorn and watching the show emoticon to insert here?)

Oh and no, my hot oil indicator has never come on either, but it probably comes on when the temperature is a little too hot.
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Old 08-18-2011, 10:26 AM   #13
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Okay I read 270 in a thread on wranglerforum. That seems high and could be totally wrong, the op was confused about what the hot oil recall actually did.

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Oh goody! Yet *ANOTHER* transmission hot oil thread. This should be fun. (where's the eating-popcorn and watching the show emoticon to insert here?)

Oh and no, my hot oil indicator has never come on either, but it probably comes on when the temperature is a little too hot.
And what stock tech did you offer this tech thread? Actually this was a direct question followed by lots of off-topic answers and two or three on topic

No need for popcorn just yet.
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Last edited by gold knight; 08-18-2011 at 10:30 AM.
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Old 08-18-2011, 12:49 PM   #14
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And what stock tech did you offer this tech thread?
If this site had a pot-stirring emoticon, I'd insert it here.

Anyway to the original topic...This is like asking, at how many quarts low does the oil pressure light come on? With the exception of a rare factory defect, you should never see the oil pressure light or the "hot oil" message if you are operating and maintaining your JK properly..and if they do come on, there's a good chance that the damage has already been done.
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Old 08-18-2011, 12:53 PM   #15
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If this site had a pot-stirring emoticon, I'd insert it here.

Anyway to the original topic...This is like asking, at how many quarts low does the oil pressure light come on? With the exception of a rare factory defect, you should never see the oil pressure light or the "hot oil" message if you are operating and maintaining your JK properly..and if they do come on, there's a good chance that the damage has already been done.
It does, press the [more] button

I do agree with you... but it would be interesting to know that number and why the op asked the question.
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Old 08-18-2011, 01:17 PM   #16
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It does, press the [more] button

I do agree with you... but it would be interesting to know that number and why the op asked the question.
excellent! My old-man eyes couldn't see the white lettering on the gray background.

Yes, I'm curious to know why he asked too. This topic has just been so beaten to death around here. Usually what ensues is a Chrysler witch hunt for supposedly provisioning an "inferior" transmission and/or transmission cooling system in the JK, followed by a conspiracy theory that Chrysler's HOTOIL message is just a big cover-up, and finally a mandate that everyone must install a transmission cooler or face certain transmission-related catastrophe, rather than just RTFM and following proper operation and maintenance.

Last edited by sdaly; 08-18-2011 at 01:19 PM.
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Old 08-18-2011, 04:24 PM   #17
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JK Wrangler Rubicon,
At what temperature does the transmission hot oil light come on ??
It was not my intent to dredge up all the old transmission temperature issues on the JK.
I only wanted to know the temperature setting of the Trans Hot Oil Light.
I have an aux trans oil cooler installed. After a 35 mile highway run at an OAT of 108 degs, I measured my transmission pan temperature with a laser thermometer, and it read 204 degs F.
I've read on several transmission sites that trans oil temps in the 200+ deg range start to deteriorate the trans oil and ultimately the transmission.

Thats all...........
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Old 08-18-2011, 05:31 PM   #18
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Where in the world is your transmission cooler?? I have a temp gauge on mine, while driving normal (i.e. not towing) it runs only 30-35 degrees above ambient. So on summer Dallas days, at 105, the temp gauge while driving reads in the 140 range, and only in stop-n-go traffic does it climb into the upper 100's. Towing is a bit different. When pulling my heavy trailer, the gauge reads 50-60 degrees above ambient (driving) and sometimes gets into the low 200's in traffic. Only when backing up where there is low air flow and poor oil circulation does it get in the 220+ range.

So in my mind, with a properly installed oil cooler, it should never get into the 200 range when driving, and only into the 200's in extraordinary situation (go slow off road, towing, heavy traffic....maybe). Even offroad (Gilmer Texas), I do not recall the gauge getting up to 200 in 4lo climbing some of the go slow hills.

And my oil cooler is AFTER the in-radiator pre-heater/cooler too. Some people bypass that one, but any heat you can dump before final cooling seems to me to be a good thing.
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Old 08-18-2011, 11:18 PM   #19
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i dont remember if mine was done under recall or if the tech did it regardless. my build date is 01-23-07. the hot oil warning does in fact come on. i didnt have an aux gauge at that time.

it came on last September running the beaches at OBX in high range.

if you dont have one, an aux cooler is HIGHLY encouraged. it really takes the worry out of it.
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Old 08-19-2011, 05:50 PM   #20
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After a 35 mile highway run at an OAT of 108 degs, I measured my transmission pan temperature with a laser thermometer, and it read 204 degs F.
I've read on several transmission sites that trans oil temps in the 200+ deg range start to deteriorate the trans oil and ultimately the transmission.

Thats all...........
You're good. 204 is nothing to worry about at all.
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Old 08-19-2011, 08:37 PM   #21
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Factory service manual for 08 says the Mysterious DING warning(the hot oil light replaced it) was set to come on at 240, so I am assuming the hot oil light comes on at the same 240......It was never explained anywhere what the mysterious ding was, thats why they added the hot oil light.........I read Atf 4 trans fluid will boil at 255 or there abouts, been awhile since I read it.

Before I added my trans cooler my JK's trans ran in the 220's while wheeling moderate trails, and thats reading it with the Aeroforce gauge.
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Old 08-19-2011, 10:54 PM   #22
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Mine went off this spring and before I could get off the hwy my tranny was junk.
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Old 08-20-2011, 03:43 AM   #23
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Factory service manual for 08 says the Mysterious DING warning(the hot oil light replaced it) was set to come on at 240, so I am assuming the hot oil light comes on at the same 240......It was never explained anywhere what the mysterious ding was, thats why they added the hot oil light.........I read Atf 4 trans fluid will boil at 255 or there abouts, been awhile since I read it.

Before I added my trans cooler my JK's trans ran in the 220's while wheeling moderate trails, and thats reading it with the Aeroforce gauge.
It's been pretty well established the mystery ding isn't associated with transmission temp.
I still get the mystery ding once in a while. Even when the transmission temp is only 120F.
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Old 08-22-2011, 02:53 PM   #24
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I read Atf 4 trans fluid will boil at 255 or there abouts, been awhile since I read it.
It's flash point or "smoke point" is more like 375-400 degrees F (oil doesn't actually "boil" unless it contains water or other contaminants that cook off at temperatures below the oil's flash point, which can make it appear to boil, but some incorrectly refer to its flash point as a "boiling point"). Take a look at what us Dodge Cummins diesel truck owners are running. These trucks are running the same ATF+4 as the JK and it's not unusual to regularly see 230-240 under normal towing conditions and the Dodge Cummins 48RE transmission is set to show tranny overtemp at 275 last I checked. This is not your father's ATF. This is ATF+4 and its group III base stock and lubrizol additive package makes it much more resilient to oxidation and thermal breakdown than the old school dexron stuff was. Regularly running low to mid 200's isn't something to worry about.
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Old 08-23-2011, 02:25 PM   #25
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Despite Chrysler's well planned efforts to avoid responsibility, including having their call center rep try and stonewall discussions on JKO about this serious defect, by now it's well established the JK automatic needs additional cooling, particularly on the ULs. Just a matter of time before the NHTSA investigation into JK fires gets to the bottom of this and orders fitment of the FACTORY aux cooler being installed on JKs sold overseas. Chrysler's even been caught fitting them on warranty replacement trans jobs here in the USA. They know the problem, they know the fix, they just don't want to pay for it unless a gun is held to their little pointy corporate heads.
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