2017 Cadillac XT5 Steering

The contact owns a 2017 Cadillac XT5. The contact stated that while her husband was driving at approximately 50 MPH, the vehicle lost power steering functionality. The contact stated that the power steering assist message was displayed. The vehicle was taken to the local dealer where it was diagnosed and determined that the power steering assist had failed. The contact was informed that the part was on backorder. The vehicle was not diagnosed or repaired. The manufacturer was contacted. The failure mileage was approximately 78,146.

The power assist steering goes out and you have to manually try to steer the car the part that has to be replaced is the power assist steering module which is located in the steering assembly I have found this to be a problem with Cadillac XT5 models from 2017 through 2019 also in a Chevrolet SUV MODEL of the same years an internal memo was sent out but not notified owners

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

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.

THE 2017 CADILLAC XT5 HAS A DEFECTIVE THERMOSTAT, WHICH SENDS A FALSE SIGNAL THAT THE ENGINE IS OVERHEATING. THEREFORE, YOU GET A "STEERING ASSIST IS REDUCED DRIVE WITH CARE", WHICH YOUR STEERING TO BE HARD AND NOT AS EFFECTIVE AS IT SHOULD BE. GMC IS AWARE OF THE PROBLEM, BUT FAILED TO REMEDY IT, BUT ISSUED A BULLETIN #17-NA-158 IN MAY OF 2017. THIS PROBLEM IS SO WIDESPREAD THAT THE PART TO FIX THE PROBLEM IS ON "BACK ORDER" EVERYWHERE.

Message Powersteering Assist is reduced. This could cause steering problems and a potential collision. Cause is due to failure of thermostat design and insta llation. Believe an investigation is possibly warranted. GM issued a service bulletin making dealers aware of the faulty design in May 2017. But consumers were not advised of the danger.