The 2026 Cadillac CT5 carries a five star overall safety rating from the National Highway Traffic Safety Administration, but its latest performance in Insurance Institute for Highway Safety testing paints a far less reassuring picture.
Cadillac’s luxury sedan earned Poor ratings in two important IIHS crash tests, including the institute’s tougher side impact evaluation. The results exposed weaknesses in driver head protection and rear seat safety that are not immediately visible in the car’s headline federal rating.
That contrast matters because many buyers see five stars and assume the discussion is over. In the case of the CT5, the full set of results tells a more complicated story.
The Driver’s Head Missed the Airbag
The most alarming result came from the updated IIHS side impact test, which is designed to simulate being struck by a modern SUV.
The test uses a 4,200 pound moving barrier that hits the driver’s side at around 37 mph. During the collision, the CT5’s side curtain airbag deployed, but the driver dummy slid downward and moved past it. The dummy’s head then struck the window sill and door trim.
That is exactly the kind of movement the curtain airbag is supposed to prevent.
IIHS recorded a peak head acceleration of 161 g and a HIC 15 score of 1,282, both pointing to a high risk of serious head injury in a similar real world crash.
Interestingly, the rear passenger dummy performed much better. Its injury measurements received a Good rating, showing that the CT5’s rear side protection worked effectively in this particular test.
Rear Seat Safety Pulls Down the Front Crash Score
The CT5 also received a Poor rating in the updated moderate overlap front crash test.
The car’s basic structure held up well, and protection for the front occupants was not the main issue. The weaker result came from the rear seat, where the dummy showed a moderate risk of chest injury and a likely risk of head or neck injury.
This reflects a growing focus within IIHS testing. Modern front seats often benefit from advanced airbags, seat belt systems, and load limiting technology, while rear passengers may not receive the same level of protection.
For the CT5, that gap was enough to pull the entire test rating down to Poor.
The Problems Go Beyond Crash Protection
The CT5’s disappointing performance was not limited to the two crash tests.
Its standard headlights also received a Poor rating, while the vehicle to vehicle front crash prevention system earned another Poor score. Those results mean the sedan does not qualify for either of the IIHS Top Safety Pick awards.
That is a notable setback for a luxury model competing in a segment where strong safety technology is expected, not treated as an optional advantage.
How Can a Five Star Car Score So Poorly?
The answer lies in the difference between NHTSA and IIHS testing.
NHTSA evaluates vehicles using a standardized set of frontal, side, and rollover tests, then combines the results into an overall star rating. IIHS uses a wider range of evaluations and gives each area its own grade, from Good to Poor.
IIHS has also updated its procedures to better reflect the vehicles and crashes seen on today’s roads. Its side impact test now uses a heavier, taller barrier that more closely represents an SUV or pickup. Its revised front crash test places greater emphasis on rear seat occupants.
That means a car can perform well under federal testing and still reveal serious weaknesses in newer, more demanding scenarios.
Cadillac has pointed to the CT5’s five star NHTSA score and says it remains confident in the sedan’s safety. That rating is still relevant, but the IIHS results show why buyers should look beyond a single number.
The Competition Shows It Can Be Done Better
The CT5’s performance becomes more difficult to overlook when compared with other cars tested under the same conditions.
The BMW 5 Series and Toyota Corolla both kept the driver dummy’s head against the curtain airbag and away from hard interior surfaces in the updated side impact test. Both earned Good ratings.
The fact that a mainstream compact car and a premium German sedan handled the same impact more effectively suggests the test is not simply too harsh for lower or lighter vehicles. Other manufacturers have managed to engineer around it.
What Buyers Should Take From These Results
The Cadillac CT5 remains an appealing luxury sedan, especially for buyers who still want a traditional four door model from an American brand. Its five star NHTSA rating also should not be dismissed.
Still, the IIHS findings reveal several areas that deserve attention. Driver head protection in a severe side impact is a genuine concern, rear seat occupants may face a higher injury risk, and the sedan’s headlights and automatic emergency braking system fall behind the strongest competitors.
For buyers who place safety near the top of their list, the best approach is to consider both testing programs rather than relying on the largest number in the brochure.
The CT5 may wear five stars, but its latest crash results show that those stars do not tell the whole story.
