Why are the RDX's IIHS ratings falling?

2023 it was TSP+ (and all earlier models going all the way back to 2019)
https://www.iihs.org/ratings/vehicle...-door-suv/2023

2024 it was TSP
https://www.iihs.org/ratings/vehicle...-door-suv/2024

2025 is is not even TSP
https://www.iihs.org/ratings/vehicle...-door-suv/2025

 

Its possible that other manufacturers made improvements over past few years. RDX overall design is 7 year old now

 

It’s because the standard gets updated. The new requirement for TSP is to have at least an Acceptable rating on the updated moderate overlap frontal test. However, the RDX hasn’t been retested on that test, so it’s impossible for it to earn the TSP rating. Same reason why the vaunted Volvo XC60 doesn’t have a TSP rating. The IIHS prioritizes tests for new cars, and both it and the RDX hasn’t seen a new generation for many years. It doesn’t mean that they wouldn’t do well on the test if they did get retested (in fact, Volvo has shown even their 10 year old designs can ace new tests).

 

Interesting. Looks like MDX made it, though.

 

Because the MDX saw a redesign after the updated test was introduced in 2022. The IIHS doesn’t have unlimited funds, so it will prioritize new cars and cars that sell in high volume when deciding which cars to test.

 

I see all good ratings in that link, only pedestrian avoidance rating is acceptable. 2025 rdx was not tested

 

And also torso for driver during side impact.