2018 CADILLAC XT5 Complaints

Cadillac XT5 had a “steering assist is reduced” message on the driver information center. P0128 Code

2018 xt5 code p128 steering assist is reduced drive with care its only has 37.282 miles on it steering got hard to control

Message on dashboard "steering assistance reduced drive with caution". Messages appeared April 2025 and July 2025. Previously electric module needed to be replaced. Steering message caused me to be very cautious. Radiator had to be replaced because of leak. Both issues repaired at dealership. Vehicle has less than 40,000 miles.

My 2018 Cadillac XT5 has a serious water intrusion issue—water is leaking into the interior cabin through the sunroof or roof seams. This appears to be the result of a known manufacturer defect covered in GM’s Technical Service Bulletin TSB 19-NA-167. The leak has caused significant water accumulation on the floor, raising concerns about mold, electrical failure, and corrosion. I brought the vehicle to a Cadillac dealership, and they confirmed the issue. The total repair estimate is around $7,900. Cadillac offered partial goodwill coverage, but I am still being required to pay $3,400 plus tax out of pocket. I have authorized the repairs but am seeking reimbursement for the portion Cadillac is not covering, as this is not normal wear and tear—it is a clear defect in manufacturing that poses safety and health risks. GM should be fully covering this issue for affected vehicles.

Engine thermostat defective, which causes the computer to speed up radiator fans, and causes temperature gauge to read zero. Dealer replaced under warranty at 68,000 miles and same problem reoccurred at 90,000 miles. Common problem on Cadillac XT5’s (all years)

The contact owns a 2018 Cadillac XT5. The contact stated that while driving at an undisclosed speed, the vehicle stalled with the check engine warning light illuminated. The vehicle was towed to the dealer where it was diagnosed that the engine had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 86,000.

Rear toe arms are malfunctioning barely drive vehicle on 54342 mileage on vehicle. Having to do with steering jeopardize Leicester on my and my family. VMy vehicle has been inspected. This issue has been inspected by Cadillac mechanics and indicated needs immediate attention. No indicator lights were illuminated to inform me of danger. I am impalled about this situation and I shouldn’t be charged for this mechanical default.

I received a Steering Assist is Reduced message and the cooling fan ramped up to full speed. In contacting Cadillac, it seems that it is a below temperature error for the thermostat. Unsure what the thermostat has to do with steering. Also in researching this, this is a wide spread issue and needs to be a recall. My XT5 has 48000 miles on it and the powertrain warranty expired 3 months ago. I believe this should be a recall and should be repaired by the manufacture as it could cause a safety issue while driving.

The contact owns a 2018 Cadillac XT5. The contact stated that while driving at slow speeds, the vehicle unintendedly shut off. The vehicle was towed to the local dealer who diagnosed that the body control module (BCM) had failed and needed to be replaced. The contact was informed that BCM failure was caused by internal corrosion to the unit due to condensation leaking from the HVAC water line, which was positioned above the BCM. The vehicle was repaired. The contact stated that the BCM unit was previously replaced due to the same failure. The manufacturer was notified of the failure. The failure mileage was 95,000.

The coolant thermostat was broken and gave two check engine codes P0128 and P0128P. AC was not functioning when the thermostat was not working, which can be dangerous in summer. It is also a very common problem with Cadillac XT5 and GMC Acadia.