2020 Acura Rdx

The vehicle’s keyless access/security and body control system malfunctioned. An authorized Acura dealer previously diagnosed water intrusion from blocked panoramic sunroof drains, including water reaching the Body Control Module (BCM) Multiplex Control Unit. The dealer reported that this was causing false security alarm activation and battery drainage and recommended BCM replacement. The vehicle and affected components are available for inspection upon request.The condition has since escalated. The security alarm repeatedly activated without cause and became difficult or impossible to silence. The dashboard displayed, “Keyless Access System Problem\. See Your Dealer.” During the latest episode, the engine spontaneously started without an authorized remote start command, and attempts to stop the engine were unsuccessful. The 12-volt battery was therefore disconnected to disable the vehicle and will remain disconnected until the vehicle is taken to the Acura dealership for diagnosis. This created a safety risk because the vehicle demonstrated unintended engine operation and loss of normal control over engine shutdown, creating potential risks of unintended operation, exhaust carbon monoxide exposure if this occurred in an enclosed area, and battery depletion. The dealer has confirmed the water intrusion and BCM security system malfunction. However, the unauthorized engine start and failure to shut down event occurred after that diagnosis and has not yet been evaluated by the dealer. Before the unauthorized start, symptoms included repeated false alarms, battery drainage, documented water intrusion, and the Keyless Access System warning. The warning was photographed at approximately 81,416 miles during the same period of escalating electrical security problems.

My RDX experienced a water-intrusion failure involving the panoramic sunroof drainage system and associated electrical components. An authorized Acura dealer diagnosed the right-front sunroof drain as backed up/overflowing, allowing water to reach the Body Control Module (BCM/Multiplex Control Unit). The dealer attributed abnormal security-alarm activation and battery drain to the water-damaged BCM and indicated that the BCM required replacement. The dealer also identified a blocked right-rear sunroof drain that allowed water to reach the tuner, causing radio/stereo malfunction and requiring tuner replacement. The water intrusion reached critical electrical components and caused unpredictable electrical behavior, including unexplained security-alarm activations, exterior lights remaining illuminated, complete battery discharge, loss of keyless access, and ultimately a no-start condition that rendered the vehicle inoperable. After the battery was depleted, I had to use the manual key to enter the vehicle. This created a risk of being stranded and raised concerns about the reliability of the vehicle’s electrical systems. There were no known dashboard warning lamps or conventional warning messages before the failure. AcuraLink recorded unexplained security-alarm activations on August 16, 2026, at 10:27 PM EDT and again on August 19, 2026, at 10:51 AM EDT. During the overnight incident, the alarm activated and the exterior lights remained on until the recently replaced battery was completely discharged. The car also experienced radio/stereo problems traced by the dealer to water reaching the tuner, and water was present in the passenger-footwell area. My car was inspected and the problem confirmed by an authorized Acura dealership. The car is available for inspection and available upon request.

This is a well known problem that when water gets into the intercooler, the car goes into limp Mode. This happens to my daughter, while driving 85 miles in the fast lane in the highway. Her check engine light started flashing, she was unable to accelerate, and she was scared! She had to pull over in the left lane, against the median.This is a safety hazard! I am paying over $1000 to have this fixed. TSB 20-053 this should be a recall!!

My 2020 vehicle lost all power when I was attempting to pass an 18-wheel trailer on the expressway. I took it to the dealership which was less than a mile away. They told me I needed a head gasket replacement @$6500. They replaced the HG and it ran great for 5-6 months. Then exact same thing happened again on expressway. It was another head gasket. After searching online I found a lot of history on my vehicle where the 2.0L turbo engine was failing prematurely.

While in traffic and stopped at a light, the engine stalled and completely shut down all of a sudden. I had to restart the car and was able to drive home. The engine stalled while in traffic with two other passengers in the car and during a time with other vehicles on the road. The car stalled shortly after turning a corner and other cars potentially rear ending my car due to a sudden stalling. I’m on the way to the dealership where I purchased the 2020 Acura RDX AWD brand new for a check up. The vehicle has not yet been checked by anyone but will be later today. When the car stalled, there were no warning lamps or messages. This was the first time happening but the electrical system has turned off unexpectedly before. I’ve brought the car back to the dealership for the electrical system and it was previously repaired. The new problem includes the electrical system outage plus engine stalling during traffic. Very scary and unacceptable for any car.

Re: NHTA recall 23V-858 This particular recall has been active since 12-18-2023. I have checked with my local dealership, Scanlon Acura in Ft Myers, FL, to arrange for a repair several times. Each time I have been told that they do not have the part. On Friday, 12-6-2024, a spoke to a service representative at the dealership. He advised me that they did have the part and scheduled an appointment to replace the defective part on Monday, 12-9-2024. When I arrived at the dealership, I was told that they did not have the part. Something is not right here. I suspect that the dealership does not want to replace the part because it is time-consuming, expensive, and represents an action where they do not receive enough compensation. This recall has been active for nearly a year, and NHTSA should intervene to expedite this process in order to prevent possible car crashes and injuries.

Engine judders at 2k rpm around 60 mph. Car has 92k miles with timely documented service maintenance. Took car to the dealership and said there’s a head gasket leak on cylinder 4 and needs to be replaced. Contacted American Honda about the issue and they said they cannot cover the repair cost. They also don’t have the replacement part for the fuel pump recall for a long time as well.

On a long road trip ([XXX]) from Milwaukee, Wi to Bowling Green, Ky. and from From Bowling Green, KY to Orlando, FL. While driving from Bowling Green, KY about 8 hours into the drive, we were in a massive rain storm which started in Atlanta, GA. and did not end until we crossed into Florida. About 60 miles past the border of Florida traveling on [XXX], I needed to over-ride the cruise control traveling at about 80 mph and allow for a merging vehicle, so I pressed hard on the accelerator and the vehicle essentially shut off and the MIL was flashing. I was in the left lane (two lane highway at this point) traffic was moving quickly, but fortunately I was able to merge safely across traffic to the right shoulder without causing an accident because the vehicle was slowing at a rapid rate. The vehicle came to a stop on the shoulder with my wife and two kids freaking out. I shut off the vehicle, successfully restarted the vehicle and accelerated into traffic. Fortunately this did not happen in the mountain pass where there is no shoulder to pull into. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)