2017 Cadillac XT5 Engine Problems

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.

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.

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.

The contact owns a 2017 Cadillac XT5. The contact stated while driving approximately 40 MPH, the vehicle overheated and stalled. The power steering assist was reduced with the drive with care message displayed. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The vehicle was taken to an independent mechanic who informed the contact about the thermostat failure, engine, and DTC: P0128. The manufacturer was not contacted. The approximate failure mileage 43,806.

engine light comes on, brake assist service light comes on when transmission idles down at stop signs, stabilitrak service light comes on after transmission idles down after a stop. This has happened twice and I had to get it repaired.

THE VEHICLE IS USING ABOUT ONE HALF QUART OF OIL EVERY 1000 MILES. ABOUT HALF WAY THROUGH OIL CHANGE, THE ENGINE ADD OIL LIGHT COMES ON. DEALER HAS SO FAR SAID THIS IS "NORMAL".

MY CAR IS EQUIPPED WITH THE AUTO STOP FEATURE TO SAVE FUEL. I WORKS FINE BUT IS VERY UNSAFE ON HILLS HERE IN SEATTLE. TWO WEEKS AGO I WAS STOPPED AT A LIGHT ON A HILL AND THE ENGINE TURNED OFF. I HAD A FREE RIGHT SO I STEPPED ON THE GAS PEDAL, THERE WAS A DELAY BUT BEFORE I COULD TAKE MY FOOT OFF THE ACCELERATOR MY CAR LUNGED FORWARD IN THE INTERSECTION ALMOST STRIKING A PEDESTRIAN WHO WAS J WALKING. THE NEXT INCIDENT HAPPENED TODAY WHEN I WAS AT A 4 WAY STOP ON A HILL. THERE WAS A CAR ON MY LEFT THAT WAS WAITING FOR ME TO GO SINCE IT WAS MY TURN AND I STEPPED ON THE PEDAL AND THERE WAS A DELAY SO I PUSHED HARDER. THE OTHER CAR THOUGHT I WAS WAITING FOR THEM SO THEY WENT AND THEN MY CAR LUNGED FORWARD AND CAME WITHIN A FOOT OF HITTING THEM. THEY WERE NOT TOO HAPPY AND GAVE ME A WELL DESERVED FINGER GESTURE. I BELIEVE MY CAR MAY CAUSE AN ACCIDENT BECAUSE OF THIS. THE DEALER SAID THEY COULD NOT TURN OFF THE FEATURE. I CALLED THE CADILLAC COMPANY AND FILED A COMPLAINT BUT HAVE NOT HEARD FROM THEM. I WOULD LIKE TO HAVE THE FEATURE TURNED OFF. I KNOW ITS FOR GAS MILEAGE BUT I CAN AFFORD THE GAS.

TL* THE CONTACT OWNS A 2017 CADILLAC XT5. WHILE DRIVING 25 MPH, THE VEHICLE FAILED TO ACCELERATE AND THE CHECK ENGINE INDICATOR ILLUMINATED WITHOUT WARNING. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROADWAY AND THE VEHICLE STALLED. IN ADDITION, THE VEHICLE SHOOK WHILE THE CONTACT ATTEMPTED TO ACCELERATE. NORTH BAY CADILLAC IN ROSSLYN, NEW YORK WAS MADE AWARE OF THE FAILURE AND PERFORMED AN ENGINE CONTROL MODULE REPLACEMENT, BUT THE FAILURE RECURRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 1,000.

THE CARS AUTO SHUTOFF SHUTS OFF THE INSTANT THAT THE CAR STOPS, AT STOP SIGNS, THE CAR SHUTS OFF CAN THEN STARTING TO PRECEED HESITATES AS IT STARTS. THIS COULD CAUSE A MISJUDGEMENT IN THE ABILITY TO ENTER THE TRAFFIC FLOW AND RESULT IN AN ACCIDENT. THE FEATURE IS NOT ADJUSTABLE.