NHTSA Complaint #11472506 — 2020 HONDA RIDGELINE

Beginning about 3 months ago the Automatic Idle Stop (AIS) would randomly not function at start-up during the length of a drive though there was no indication of any issue on the dash. Shutting off and restarting would allow usually allow it to function normally. About 6 weeks ago the AIS stopped the engine at a red light, and when I removed my foot to accelerate the engine did not start, the car shut off. It took a couple of seconds to realize the vehicle was down, I had to shut the car completely off and restart to get moving almost getting rear-ended since I did not move when the light changed even though my brake lights went off, confusing the driver behind me. AIS failing to start has become more frequent and now happens at least every other day. In traffic this is a safety issue for sure. Additionally, the LKAS system randomly displays a new message on the dash that it is disabled for a few seconds while driving on the freeway and then clears itself. Other seemingly related electrical issues started at the same time. On several of the occasions that the AIS failed to restart, All dash lights flickered rapidly, and the speedometer needle bounced wildly. after shutting down and restarting the A and B Trim computers had been zeroed as well as the MPG average being zeroed, and the Economy mode had been switched of. These nuisance electrical issues are not a safety concern themselves but may help point to a common failure which does cause the safety issues of the AIS and the LKAS systems. I believe you are investigating similar AIS issues on the Honda Pilot which shares many of the electrical and drive train components with the Ridgeline.