Is it still in the powertrain (6/70) warranty? If so let the dealer handle it. It is probably either the sensor itself or a wiring harness issue.

Rodger

 

Thanks for the response. Does the 6/70 apply even if I’m not the original owner?

 

I have the exact same two codes PO700 and PO711 the car runs fine, just have the check engine light.
2017 Cadillac ATS Sedan 2.0 Turbo AWD 54,000 miles. Does Serafin 44 have a follow up as to what was repaired, was it under warranty etc.,

 

As a follow up to members who have experienced these codes, took my ATS to the dealer and with 54,000 miles on the car I was still under the powertrain warranty. The wiring harness located in the transmission above the pan was replaced
at no charge. The wiring harness contains the fluid temperature sensor. It has to be replaced as one.

 

Do you happen to have the paperwork showing the part # for the wiring harness and I'm past warranty by a few thousand. Would it be this one? ACDelco® - Genuine GM Parts™ Automatic Transmission Wiring Harness They said it was inside it too, right? I'd assume since it's temperature sensor.

 

Thanks for the update GMF, always good when someone posts a resolution instead of just ghosting.

 

Sorry for being absent for such a while.. military life doesn’t always send me home at the end of the day .
So in case anyone cares. The resolution was that rear temp sensor. Fixed 100% of the problem and have been fine since. Again sorry for ghosting, it was never the intention.

 

For those doing this yourself, please use a torque wrench when installing the transmission pan. Excessive torque will result in uneven sealing and leaks and if you really overdo it you will gain familiarity with Helicoil inserts after you strip the threads in the aluminum transmission body. I believe that a crisscross tightening pattern is needed for the transmission pan to ensure proper seating and gasket compression.

The pan gasket is single use only and should be replaced whenever the pan is removed. Get an OEM gasket and also replace the filter while you are in there so that hopefully you won't have to be in there again anytime soon.

Rodger

 

If this is the process of replacing the wire harness #24298757 (Transmission Temperature sensor replacement: Yukon, Suburban, Silverado, Sierra 8L90 8 speed P0711 - YouTube ), it doesn't seem very difficult. Why would the dealer want to charge $1,150? Am I missing something? $65 for part, $60 for 6 quarts of transmission fluid and cleaning the transmission pan up. Is there something different with the ATS 2.5L, luxury sedan?

 

Sterling1, what year is your ATS? The 6L45 (baby 6L80/90) was used prior to 2016 and it uses a very different setup for temperature sensing than that used in the 8L45 (baby 8L90) which appeared in the 2016 and later ATS models.

The 6Lxx series integrates the temperature sensor into the TCM and hydraulic control module, it is called a TEHCM. If you have the 6L series, then it will be a more expensive part that is also more involved to replace.

So, if you have the 8Lxx series 8 speed series it is a simple and low cost home fix. You can repair the 6Lxx series at home also but it is more expensive and considerably more involved. You should be able to find PDF manuals for both the 6Lxx (search for 6L80 which is the most popular torque variant) and 8L90 online which will show the internal breakdown of parts along with torque values for fasteners.

Rodger

 

Sterling1, what year is your ATS? The 6L45 (baby 6L80/90) was used prior to 2016 and it uses a very different setup for temperature sensing than that used in the 8L45 (baby 8L90) which appeared in the 2016 and later ATS models.

The 6Lxx series integrates the temperature sensor into the TCM and hydraulic control module, it is called a TEHCM. If you have the 6L series, then it will be a more expensive part that is also more involved to replace.

So, if you have the 8Lxx series 8 speed series it is a simple and low cost home fix. You can repair the 6Lxx series at home also but it is more expensive and considerably more involved. You should be able to find PDF manuals for both the 6Lxx (search for 6L80 which is the most popular torque variant) and 8L90 online which will show the internal breakdown of parts along with torque values for fasteners.

Rodger

Mine is a 2016 2.5L Luxury Sedan manufactured on 2/16. I don't know which transmission it has. I bought it used but I'm going through all the paperwork and manual trying to find it.

 

I have a 2016 CT6 2.0 with the 0700 and 0711 codes just popped up. Is it safe to drive in short trips in town? Also curious if anyone has done this repair or how difficult it is? I have some friends that are mechanics and say it is something they can do. I’m just nervous as they aren’t Cadillac mechanics and realize it might really be more than most would think. I know at the dealer they will likely charge an insane amount. Last time I brought it in they charged me per item diagnosed. $289 each. Can’t trust anyone in south Florida to treat you right it appears. Haha. We all know they hook it up once and get everything in one diagnosis.

 

Did you ever get it fixed I have the same codes pulling and same year car