High Transmission Temp Warning - Stalling in 4lo

Tried doing some searches for the same issue I ran into this past weekend but wasn't able to find a similar experience.

I was in 4lo going up a steep incline in my 2016 Sport 4x4 (no tow package) and in the middle of the ascent the truck stalled out and I got a warning on the middle screen stating "Transmission Temperature too High". I've had my transmission fluid level checked twice, the correct way, so I don't believe that to be an issue. Outside temps were mid 50's to low 60's and I was not using my A/C. Let the truck sit for a minute and it started right up. Fortunately I was on my way out of the trail and didn't experience the issue again afterwards.

Has anyone else experienced this? Anyone aware of any OEM or aftermarket Tranny Coolers that might have helped in this situation?

Thanks in advance to anyone with something valuable to contribute.

Here is a picture of the obstacle I was going up in case anyone is interested (not my picture, don't mind the jeeps):

 

How steep was the incline?

I never would have I thought i would hear about a Sport 4x4 without a tow package.

 

here is a picture of the exact obstacle (adding to original post)

 

Its your crank position sensor. For some reason when they fail, they make the trans light come on.

 

As of right now the trans light is not on. Maybe that was a precursor to a future failure? Would a dealership know about this issue and replace the sensor without any proof of what happened or would they need to see the trans light on?

 

Possibly. With any luck it stored a code and they will be able to verify

 

I had an odd thing happen before. I pulled into a driveway to back out and turn around. When I backed up I quickly bumped it into drive to get going (I know I know, save me the lecture, was rolling at 1-2mph). Same warning pops up and it would not clear or let drive engage. I powered off and back on again and it all worked like normal. I got home plugged in an obd2 reader and no active codes or even (submissive?) Codes. Not sure of the term for non active and active codes..it was odd but never happened again..and have went up and down 30° slow 4x4 inclines/declines since then.

 

I am betting a lot of early 16's are going to see this failure, they wouldn't have changed the part number for nothing. And I haven't heard of a single one failing yet with the updated sensor. I swapped mine since I had the old one for peace of mind and hopefully prevented a future failure.

 

My truck is one of the first. Every time I hit the trails, I pray the sensor doesn't go out

 

Automatic transmissions......

 

Was the same way, put my mind at ease... -->

 

Saw this happen to a 3rd gen member when we were out on the Miller Jeep Trail once awhile ago. We were climbing through a tough spot and his truck suddenly stalled and the AT temp light came on. Started it right back up and it was fine for the rest of the trail, hasn't had any issues since and has seen quite a bit of trail time. I wonder what it is that causes some CPS sensors to crap out seemingly out of nowhere and others seem to cause this stalling issue once or twice then nothing after that...

 

Hmmm..

Now this is straight outta my ass, but there are two examples on this thread detailing a truck stalling out in this manner when climbing over an obstacle - What if... the oil is getting up around the sensor more than it would under normal conditions. I mean, pooling/sloshing at the rear of the block where the CPS is located. I realize the sensor is sealed, but perhaps the induction/magnetic field is being messed with by the oil. I know, I know, it doesn't account for the sensors that just quit on open roads. In this circumstance though, it made me double take. Could also explain why the truck started up again (temporary failure).

What do you guys think?

No I'm not smoking weed.

Frank

 

in theory, oil should have no effect on a hall effect sensor.

 

I think you should pass the reefer

 

I agree, in theory.

I have read however, that in some applications the positioning of the sensor in relation to the object it's meant to detect (ie protrusions on say, a disk) can be critical to flux density. I know there are no adjustments/shims involved with the 2GR-FKS CPS, but I wonder how critical the distance actually is.. and can throwing a dirty medium such as oil with all kinds of contaminants in it mess with the flux density..


Pulls another drag...

 

It may be legal up here before too long

 

Rpain does your truck run oversize tires and did you put the truck in sport mode with a lower gear setting and was ect on? Unfortunately without the tow package you don't get the added tranny cooler. Was your engine temperature running warmer than normal?

 

So along with the trans temp warning, your engine died as well?

 

Understood, makes perfect sense.

Rpain's symptoms/situation sounded like a classic 2GR-FKS CPS problem (well, classic on TW anyway!)

Cheers,


Frank