2021 Acura RDX electrical system problems
10 owner complaints filed with NHTSA name the electrical system on the 2021 Acura RDX — 9% of all complaints for this model year.
What owners report
“Two low-speed sudden unintended acceleration events while parking a 2021 Acura RDX. Incident 1 (July 2026): While parking at low speed, the car unexpectedly surged forward. Flew up the curb and hit a restaurant window, causing massive undercarriage damage. Active braking did not help and seemed to…”
filed Aug 22, 2026
“The contact owns a 2021 Acura RDX. The contact stated that while at a complete stop at a stop sign or traffic light, the engine auto stop-start system was inoperable upon depression of the brake pedal. The vehicle was taken to the dealer, but the failure could not be duplicated. The dealer…”
filed Jun 12, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Over The Air Update - Vehicles equipped with the System Updates application are capable of downloading and installing Over the Air System Updates. System Updates contain upgrades that fix a variety of operational errors…
B21673 · Over The Air · issued May 18, 2026Service Bulletin - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system (MOST) bus network which can…
B23-025 · Service Bulletin/Repair Instructions · issued Dec 18, 2024Owner Notification Letter - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system (MOST) bus network…
ONL6M309172024 · Other · issued Sep 18, 2024Service Bulletin - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system transport (MOST) bus network…
B24-045 · Service Bulletin/Repair Instructions · issued Jul 30, 2024
Electrical System problems in other RDX years
| Year | Reports | Share |
|---|---|---|
| 2025 RDX | 5 | 17% |
| 2023 RDX | 4 | 19% |
| 2022 RDX | 1 | 3% |
| 2020 RDX | 26 | 8% |
| 2019 RDX | 39 | 9% |
| 2018 RDX | 8 | 10% |
| 2017 RDX | 18 | 24% |
| 2016 RDX | 8 | 20% |
| 2015 RDX | 8 | 2% |
| 2014 RDX | 8 | 3% |
| 2013 RDX | 7 | 4% |
| 2010 RDX | 2 | 9% |
Other reported problem areas on the 2021 Acura RDX
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.