2017 Cadillac XT5

I had to replace the thermostat which is a well known, documented defect/issue for this vehicle/Cadillac. I would like reimbursement from Cadillac.

While driving down the freeway at approx. 65 miles per hour, I heard a very loud sound like an explosion, or a huge balloon exploding, and then heard crackling of glass. It was very scary and dangerous. I had to slow down immediately, and was able to get off the freeway. I pulled into a gas station, and tried to figure out where it came from. I realized that my sunroof was either hit with something or just simply exploded. There was a hole in the center, and the glass was cracked throughout the front sunroof. I could hear the glass pieces moving around on the sunroof shade that was thankfully closed. I bought duct tape and covered the hole and all of the cracks so I could drive it home. I took side streets and drove slowly home.

I purchased this used car in the end of July 2025. Within the last month the service transmission light came on. Within a 24-hour period, the message changed to, "service transmission unable to shift Soon". Also alarm bells go off when I first start the car and sometimes during driving. The car feels like it drives correctly and smoothly with no shifting issues. Sometimes when that second message and check engine light icon being comes on, there seems to be a third message that is trying to pop up behind it but it does not. It seems like there is a glitch in the system. This was very concerning and scary for me. My research shows me that this has been a chronic problem for my make and model and year of car. I've also heard it can be even time to check and or change the transmission fluid. That needs to be a different message all together without causing alarm that the transmission itself is not functioning properly. I have not driven this for 10 days because many repair shops in dealerships are telling me not to risk it and of course want me to bring this in for a diagnosis. It is costly and hard to discern and trust who to go to for the correct information. The dealership should be responsible for a recall and replacing this sensor or modular so people do not have a cause for alarm if it is something as simple as needing to change the transmission fluid. There is also no dipstick on this vehicle so no local fluid fill station can check this. Many people have complained and are at a loss. I see there is a bulletin on this subject but no recall. Please take action and turn this situation into a recall once and for all to help. The little folks like me stay more safe and better informed about the health and longevity of our vehicles. Thank you for your time in reading this.

Catalytic Converter on my 2017 XT5 had weld crack Oct 2025. Causing loud noise and exhaust to enter cabin of vehicle. This was the second convertor to do this. In 2023 I had to have the other catalytic convertor on this same vehicle changed out by the Sewell Cadillac dealership for the same problem. That time I only had 50,000 miles on the car so the dealership did it for free (after I found that they had to cover up to 80,000 and they acted like they didn't know that and had quoted me $2000). This time in 2025 I had 80,805 miles so I had to pay $1010 to have it replaced by an outside repair shop. The technician says since we had to have them both replaced and the car is only 8 years old, it is probably a design flaw. He told me to report it. I see another complaint for the same thing and I see they did a recall on some from California vehicles for something with the catalytic convertor and a recall on some in 2022 and 2023 vehicles for an issue with the catalytic convertor. I expected better from GM and Cadillac. I wonder how many other Cadillac XT5 owners have had this problem but haven't known to report it. You should contact the Cadillac dealerships and see how many they have changed out.

9/17/25 I purchased 2017 Cadillac Xt5 platinum from a dealership. It came with a dash mat which was concealing cosmetic damage to vinyl around air bag on passenger side, and was unglued throughout entire dashboard. I didn't have a vehicle inspection before buying car, nothing reported on Carfax. And I asked dealership why they used Velcro and dashmat to conceal damage. No response.

An issue is pipe cracking at the left catalytic converter mounting flange weld, causing exhaust noise, odor, and potential emission system failure. It just cost $2013.00 to have fixed.

There is an open service bulletin on my car - 17128 Potential Loss of HVAC Control. This loss of control affects the defrost on the vehicle making it very dangerous to drive when it is raining out as it severally reduces visibility.

Steering reduced assist drive with care on the dash board . It states drive with caution not sure if this is dangerous or even driveable I am 8 months pregnant and now I don’t have a car I am scared to drive it. Thermostat stopped working & fan is running and won’t stop

I have a 2017 Cadillac xt5 which the transmission is kicking and has a shattering issue car was just over the warranty and was told I have to pay for a replacement car had 70k miles and was told from a mechanic that there was a recall on these cars when I checked my vin the car is not under recall but is presenting the same issue as the ones under recall.. I took it to amoco replace fluid and car still has issue. Iam trying to see my options on how to go about it..

While driving my vehicle, alert popped up on my dash stating "Steering Assist is Reduced Drive with Care" futhermore after that my Check Engine Light Turned on and my Engine Heater Stayed cold and would not warm up. Vehicle has been inspected by the Cadillac Dealer and they stated it is all due to the Sensor. However Sensor is on backorder and has taken them 3 week to get the part. They stated it is safe to drive even though all those alerts came up, since he said it appears to be stuck open, however they stated if it gets stuck in a closed state then the engine could overhead which would require having the vehicle towed in. They offer a "limited" warranty on this however since I just was past the warranty period they state you have to pay the full price. Warranty is for 85,000 miles and I am barely above it at 87675.

The straps of the car seat loosen on their own, without holding down the button to loosen the harness. It’s unsafe to continue to use this seat as the straps will not stay tightened in the event of a car accident. The seat is available for inspection if needed. No the seat has not been inspected by any third party.

The tire air pressure gage on the dash is steadily illuminated but there is nothing wrong w the air in the tire.

I keep getting Steering assistance is reduced Drive with care” message. I got it scanned a couple of times through mechanic shop, code comes up with a thermostat cooling issue. I have paid 2 shops to run a cooling pressure test and all come up negative. How can a steering issue error lead to a cooling issue. Took it to the dealership, probably wiped the error, stopped for a month before came back. Love the vehicle but this is pissing me off.

My 2017 XT5 has a joy stick issue that at times has trouble going into gear. Service transmission warning comes on then unable to shift soon and then check engine light. Cadillac replace the modular for the shifter in August 2024 now months later mid November they say the shifter has to be replaced approximately November 4 to November 18. The service Transmission warning comes on. And then unable to shift soon and check the engine light comes on. Short drives the check engine light goes off itself, unable to shift and check engine light was 1175.00 $ for the modular August 13 and now they say the shift has replaced cost of, approximately $700. So now they’re doing double labor to replace the shifter. My replacing the shifter it will send signals not to have the check engine light come on. Has this ever been a problem reported in the past. Sincerely, [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

“Steering assistance is reduced Drive with care” message while driving. Engine light appeared

The straps on the seat loosen on their own when pulled, without pressing on the button to loosen them. This would be dangerous in the event of an accident because the straps could loosen and the child would not be secure. The car seat has always been installed in the car seat base (from the manufacturer). The car seat is available for inspection if needed. The car seat has not been inspected by a third party. I reached out to the company, Nuna, to let them know if the issue and they refused to inspect or replace the seat and the only solution they suggested was that I purchase a new seat.

i was involved in a front end collision with a car that pulled out in front of me without looking. I ended up T-boning the car at approx. 20-25 MPH. Both myself and my wife were wearing our seat belts. Mine held but the passenger one held only the lap belt part. The shoulder part of the SB allowed her face to go crashing into the dashboard. She ended up with abdominal injuries and head trauma. I took it to the dealer and they say the seat belt will need to be replaced as it is defective. (You think). I can pull on the shoulder strap rapidly and it will not 'catch'.

In 2021, I took my car into a GM facility to be repaired bc the A/C kept going in and out. Car was under warranty, however, GM mechanic just did a “bandaid” fix and replaced the thermostat, when there was a service bulletin put out in 2017 for this very issue. 3 years later, my car is having the exact same problem, and since car isn’t under warranty, GM will not fix it, even though I have proof they didn’t fix it correctly the first time. The service bulletin is titled, “17128: Service Update - Potential Loss of HVAC Control- (March 30, 2017) This issue started in October 2021 the first time, was temporarily fixed. It started again in October 2024 and is ongoing.

Our XT5 began getting 'Steering Assist Reduced' message about a year ago. It comes and goes , coming more often now. The problem is the thermostat and is a very common issue with numerous complaints here and on Cadillac forums (below). The problem is, when this issue occurs the AC stops working, and when that happens you have no windshield defrost, and that is a safety problem. Cadillac has TSB's describing this issue but refuses to cover it goodwill as we are slightly out of warranty. The repair is extensive, requiring 4.5 of time. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

This model Cadillac XT5 has early failures of engine cooling systems thermostats. The thermostat sticks open causing lower engine temperatures and higher emissions. The first sign you have an issue is a reduced power steering assist message on the instrument display. The engine control module stores a p0128 code as current. Continue driving the vehicle the ECM will shut off AC compressor engagement, so no AC. The next thing that happens is you lose temperature gauge. So you are now driving vehicle with reduced power steering assist, no AC and no way of knowing if the engine is overheating. This is a known issue with the refer to GM bulletin # 17-NA-158 posted May 2017. There has been a such a demand for this thermostat, that parts back orders are common. The volume of failures should be addressed as a recall including refunds to owners who have had to pay for this repair. The fact that a colder running engine typically runs richer based on ECM programming, causes higher emissions. GM hasn’t been helping people with this repair for out of warranty vehicles. Our 2017 XT5 failed at 38,000 miles. Cadillac only offered to pay 30% of the repair leaving a balance of $585.00! This was all because GM’s failed part.