2019 Cadillac XT5

My 2019 Cadillac XT5 has repeatedly shuddered at highway speeds since shortly after purchase on July 25, 2026. It occurs around 61–62 mph while maintaining speed before accelerating. The cause is UNKNOWN. The selling dealership evaluated the vehicle and performed a front-wheel alignment, but the shuddering persists. Its repair record states that technicians could not reproduce the shuddering during a test drive. A test drive with me was proposed to demonstrate when it occurs. The vehicle has also displayed a “Steering Assist Is Reduced—Drive With Care” warning and a check-engine light. The steering felt normal despite the warning; I am not claiming an actual loss of steering. The temperature gauge has remained on cold, and the air conditioning has malfunctioned. The exact date the steering warning first appeared is UNKNOWN. On October 21, 2026, another Chevrolet dealership documented diagnostic code P0128 and recommended thermostat/coolant-temperature-related repairs. Those repairs have not been performed. The manufacturer was contacted and declined repair assistance. Dealerships have inspected the vehicle; I am not aware of a separate inspection by the manufacturer. I am concerned about the persistent shuddering at highway speeds and the warning of potentially reduced steering assistance. The cause of the shuddering and its relationship, if any, to the other symptoms remain unconfirmed. I still have the vehicle. Repair records, diagnostic information, and photographs of warning messages are available.

NHTSA ID

11773816

Incident

Jul 25, 2026

The vehicle has approximately 40,000 miles. The thermostat and/or coolant temperature sensor malfunctioned, causing the warning message “Steering Assist Is Reduced, Drive With Care” to appear. This condition raises a safety concern because the malfunction affects or appears to affect the vehicle’s steering-assist system and could make the vehicle more difficult to safely control. I believe this issue warrants investigation by NHTSA and consideration for a safety recall.

NHTSA ID

11772594

Incident

Oct 21, 2026

The computer or electrical box to steer keeps shorting out and the vehicle us unable to turn.

NHTSA ID

11740143

Incident

May 18, 2026

Went to Genesis Cadillac for oil change and they recommended the replacement of both my rear toe links. As stated on their service bill Caused by loose rear toe links. GM has been selectively recalling certain makes, models and model years recalling toe link for replacement. Most recently March 10, 2026 Buick Regals 2012 and 2013. Seems GM is aware of rear toe link issues but doesnt want to have a mass recall. Selects vehicles that are low quantity still driven. Everyone else needs to pay for defective rear toe links Even my brothers 2020 XT5 was recommended to replace rear toe links on his vehicle when he went for an oil change.

NHTSA ID

11723846

Incident

Feb 26, 2026

The contact owns a 2019 Cadillac XT5. The contact stated that while leaving the driveway, there was an abnormal sound coming from the vehicle. The contact stated that while driving at 65 MPH, there was an abnormally loud squeaking sound coming from the vehicle. The check engine warning light was illuminated. The contact thought that the catalytic converter had been stolen. The vehicle was taken to an independent mechanic who determined that the catalytic converter was severed at the connection point and cracked, and removed. The contact stated that coils were damaged, and the thermostat housing was cracked. The vehicle was repaired, but the failure recurred. The local dealer was contacted, who determined that the catalytic converter had been replaced, but the failure persisted. The dealer informed the contact that the parts were on backorder. The manufacturer was not contacted. The failure mileage was approximately 100,000. The VIN was not available.

NHTSA ID

11709970

Incident

Jan 8, 2026

Mileage

100,000 mi

We got the message that our steering may be impacted and then our temperature gauge wasn’t working nor the stop/start feature. Trip to service dealer resulted in a $1,186.14 repair for the replacement of the thermostat. This car only has 37,269 miles. We were told by service tech this is a common issue in GM models and this year of car. This was a financial hardship on us and our well maintained, and rarely used, vehicle. How can GM know this is an issue and not offer remedy thru a recall?

NHTSA ID

11709474

Incident

Jan 7, 2026

The contact owns a 2019 Cadillac XT5. The contact stated that the vehicle was parked in a parking lot. The contact then shifted the transmission into drive (D), and the engine revved loudly. The contact slightly depressed the accelerator pedal, and the vehicle experienced unintended acceleration. The steering wheel inadvertently veered to the left. No warning light was illuminated. The vehicle then drove on top of another vehicle that was parked in front. The contact stated that he was unable to control the vehicle until after the crash. The air bags did not deploy. The contact was unharmed, but his wife's hand was injured in the crash. Medical attention was not received. A police report was filed. The vehicle was able to be driven away from the crash site, but it sustained damage, and the front driver’s side door was jammed. The vehicle was taken to a body shop. The vehicle was not yet repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 45,000.

NHTSA ID

11682097

Incident

Aug 15, 2025

Mileage

45,000 mi

Steering assist disengaged, low power mode, no temperature read and check engine light. All occurred at 61k miles.

NHTSA ID

11649851

Incident

Mar 21, 2025

This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3

This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

PI to help diagnose A/C concern

This preliminary information communicates information about how to determine if a wheel and tires size change is available.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.