2017 Cadillac XT5: check engine light

Filed Feb 24, 2026 · Electrical, Transmission · CA

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.

Filed Sep 11, 2025 · Driver assistance, Steering · VA

Check engine code p0128. driver assistance, air conditioning and steering affect.

Filed Jan 30, 2025 · Driver assistance, Engine · GA

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.

Filed Nov 21, 2024 · NJ

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)

Filed Nov 8, 2024 · Steering · NY

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

Filed Jun 2, 2024 · Electrical · FL

My car has been in and out of the dealership since [XXX] All the lights come on ( check engine, ABS ,the message reads park assistance off all the lights The car goes crazy and stops running. This happened 3 times on the highway almost got rear ended. It is very scary I can not take this chance anymore. The dealership keeps changing one module after another and keeps telling me it is fixed. However it is not The car is in the dealership ship as of 10 days ago again. I will not pick it and drive it. Either me or someone else gets killed. I also opened a case with GM. However they just keep doing nothing. This matter needs to be addressed asap There is a serious problem, before someone gets killed. My name is [XXX] [XXX] [XXX] Can someone please get involved or I will go on TV or the newspaper if I have to. Thank you [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 23, 2024 · Engine · TN

ECM- engine system. Diagnostic code P26C8. Chassis Control Module Requested Malfunction Indicator Lamp Illumination. The DTC is an informational DTC. The DTC indicates an emission related DTC set in the Chassis Control Module. My service transmission message came on and would not let me go into reverse or drive. The next day the check engine light was on. This vehicle is only 34,650 miles and is a 2017. I bought it on Saturday and this happened on Wednesday!

Filed Dec 30, 2023 · Steering · FL

Message Displayed on 2017 Cadillac XT-5 "Steering Assist is Reduced - Drive With Care". No check engine light, and no apparent loss of steering. Noted that Temperature Gauge and Air Conditioning ceased to work. Suspiciously, a 2019 Cadillac XT-5 that I also own, the identical displayed message came on, with identical same mechanical issue, and just learned that an acquaintance with a newer Chevy Blazer just experienced the identical issue also. All vehicles are equipped with OnStar. Coincidence, OR any possibility that GM or OnStar computers have been hacked into, as OnStar has ability to control various functions of vehicles. To correct the issue (possibly only temporary) was to remove the negative battery cable for a short time, and reattach.

Filed Jan 5, 2022 · Driver assistance, Engine · CA

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.

Filed Sep 26, 2019 · Acceleration, Driver assistance · 56,000 miles · VA

I was traveling on I-95 at aprrox. 75/80 MPH when my dashboard lit-up like a christmas tree and my cadillac powered down to less than 50 MPH instantly. The stabilitrak, check engine light, parking brake and car assist lights came on with a warning to "travel with care". I had to maneuver my vehicle over three lanes to get off at the nearest exit. I had no idea what just happened. There was no noise, smoke or evidence that the vehicle had a problem. However, I could only drive the car 55 MPH with the foot pedal pressed to the floor board. It was 4:00 am and I was an hour from home. Instead of contacting roadside assistance, I drove the vehicle home...taking precautions. I contacted the dealership...who could not accommodate servicing my vehicle until the following morning. The following morning, all the lights were off. I dropped the vehicle off at the cadillac dealership for service. After they checked out my vehicle and took it for a test drive (taking it up to 80 MPH), I was informed that they could not find a problem. No codes were stored in the computer system. They could not duplicate what I experienced. I find that odd. I am pretty sure that when a check engine light comes on and a car malfunctions that a code would be stored. I do not feel comfortable with my vehicle. I mainly drive within my small town...not having to exceed 45 MPH on a daily basis. However, I do have to travel on the interstate for work 2-3 times a month. I am very uneasy about having to drive on the interstate at high speeds in heavy traffic again. I was not given confidence or comfort from the service department. This whole experience has left me disenchanted with this cadillac. I can't get out of it and buy or trade-in on something new at this time. I feel I should have received better service and reassurance. [xxx] parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Feb 20, 2018 · Engine · 1,000 miles · NY

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.

Filed Nov 16, 2016 · Brakes, Driver assistance · 1,800 miles · VA

I was driving in traffic, about 45mph, when the parking brake came on, I got a check engine light, service brake assist, service stabilitrack and one other light on. I managed to keep it running enough to not get rear-ended, but it is not safe. The dealer now has it, and I am in a loaner. The car has less than 2000 miles on it, and this is the second check engine light (the first did not involve the parking brake), but the dealer did not find a concrete problem for the light. Is this going to turn into a recurring problem? It is very definitely not safe.