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Discussion Starter #1
Okay, experts all welcome. For 9 months of the year or more, the car runs like a dream. as soon as the weather heats up, 80 or higher usually, I have a reoccurring issue. I own the car little almost 2 years and bought it with 23K.

Here is the issue, if the car has been baking in the sun all day and I get in to drive, I experience the following:

After a little bit of stop and go, the Car doesn’t seem shift out of 1st gear and you feel a constant resistance “hold back” the other thing that is weird is the brakes become very sensitive, meaning they seems to work extra. I can sometimes get it out of this crazy mode but other times the car just has to sit a while.
Please note its not after the tranny heats up, happens quick after the car had just been sitting directly in the sun. Car is black on black and does get super out but i have 4 other black cars and this of course doesn’t occur.

Brought to a great tranny guy, he used it for almost 2 days and couldn’t find anything. I do not get any warning lights inside , indicating a fault, nothing. If i park her in the shade, i don’t get the issue.

Feedback all welcome , including GM direct.

Thank you Frank
 

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2018 Cadillac XTS Luxury
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Without having performed any diagnositcs (which is always best to do), it seems to me, based on your description, that the problem is caused by a faulty sensor of some type. Exactly what type of sensor or where it is located, I don't know, but if the sensor is being heated up while the car sits in the sun, until at some elevated temperature it becomes faulty, it could affect the information that it sends to the vehicle controls, and ultimately results in your transmission and brake problems. Check fault codes.
 

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Discussion Starter #3
Without having performed any diagnositcs (which is always best to do), it seems to me, based on your description, that the problem is caused by a faulty sensor of some type. Exactly what type of sensor or where it is located, I don't know, but if the sensor is being heated up while the car sits in the sun, until at some elevated temperature it becomes faulty, it could affect the information that it sends to the vehicle controls, and ultimately results in your transmission and brake problems. Check fault codes.
Thank you and I think it’s that as well. One problem, no fault code.
 

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2014 XTS luxury
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Strange problems require strange solutions. If it truly is caused by an over heated sensor or possibly relay then shading areas where sensors are located may help you find the problem. It seems sensible that only sensors that have access to direct sunlight would most logically be effected so shading those areas would be a start. I.e. front grill, dash ect. But I would also consider heat transfer from the black hood to the fuse box where relays could be the culprit. Place an icepak on top of the fuse box cover and park it in the son. If the problems goes away the next step would be to test the relays. As I said strange fix for a strange problem.
 

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Discussion Starter #5
Strange problems require strange solutions. If it truly is caused by an over heated sensor or possibly relay then shading areas where sensors are located may help you find the problem. It seems sensible that only sensors that have access to direct sunlight would most logically be effected so shading those areas would be a start. I.e. front grill, dash ect. But I would also consider heat transfer from the black hood to the fuse box where relays could be the culprit. Place an icepak on top of the fuse box cover and park it in the son. If the problems goes away the next step would be to test the relays. As I said strange fix for a strange problem.
Thank you but i can’t be the only one with this issue and hoping someone will read and opine.
 

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'02 ETC CE, '04 CTS-V, '04 XLR, '13 XTS Platinum
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Trying to get an accurate fix for an intermittent, possibly heat-related transmission problem online is extremely remote. If your "great tranny guy" struck out with the car in his possession, you're unlikely to do much better here.

Other than living with it, (and the chance that it could get worse) I suggest you have a certified GM specialist who has the factory-sponsored training and experience with this transmission to check it out. They may have seen this problem before, or can search a GM database for similar resolutions, and if not, can access the transmission experts at GM's Technical Assistance Center.

And yes, it would appear that you are the only XTS owner on this site plagued with this particular XTS issue.

CCC
 

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One clue that will help you is that whatever is causing the problem, it is something that is common to the transmission and the brakes. That should whittle down the possibilities somewhat.
 

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Discussion Starter #8
Everyone I figured it out !!! As I said the brake pedal became Very sensitive it’s because the brakes were on! I used my left foot to pull up on the pedal EVER SO SLIGHTLY and the brakes released. Issue SOLVED
 

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Okay, experts all welcome. For 9 months of the year or more, the car runs like a dream. as soon as the weather heats up, 80 or higher usually, I have a reoccurring issue. I own the car little almost 2 years and bought it with 23K.

Here is the issue, if the car has been baking in the sun all day and I get in to drive, I experience the following:

After a little bit of stop and go, the Car doesn’t seem shift out of 1st gear and you feel a constant resistance “hold back” the other thing that is weird is the brakes become very sensitive, meaning they seems to work extra. I can sometimes get it out of this crazy mode but other times the car just has to sit a while.
Please note its not after the tranny heats up, happens quick after the car had just been sitting directly in the sun. Car is black on black and does get super out but i have 4 other black cars and this of course doesn’t occur.

Brought to a great tranny guy, he used it for almost 2 days and couldn’t find anything. I do not get any warning lights inside , indicating a fault, nothing. If i park her in the shade, i don’t get the issue.

Feedback all welcome , including GM direct.

Thank you Frank
 
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