It outlines all the conditions for idle stop functionality: 1. Disable Conditions for Auto Idle Stop. 2. Engine Restart Conditions After Idle Stop. 3. Engine Restart Disable Conditions. Thought other may find this information interesting. See attached PDF document. Either low on refrigerant or a low efficiency (failing) compressor. Could also be a failing cooling fan or fan relay. I lost AC and found out I had a refrigerant leak. Fixed that and then the AC only worked when the car was moving. I thought I had a failing radiator fan (single fan on my car cools both the radiator and the ac condenser) but it Message or call 877-795-3666 today. **ATTENTION, if you are a current owner of a 2016-2021 Honda Pilot and are experiencing stop-start engine issues, give us a call. Our services are absolutely FREE to you. Call 877-795-3666 ☎ now for a Free Case Evaluation or fill out our Contact Form. 1| Is There a Problem with the Engine in 2016-2021 Honda idling will not work if the requirements for idling are not met. Usually engine needs some time to cool after a heavy push. so if the temperature is too high, it won't idly stop the car. It will let it cool and then stop it. There are other conditions as well. This to protect the engine from hot turn off. The Auto Idle Stop suspend indicator comes on and a message appears on the gauge when the Auto Idle Stop system cannot be activated. 2 Indicators P. 80 2 Auto Idle Stop System ON/OFF P. 412 If the driver’s door is opened while the indicator (green) comes on, a buzzer sounds to notify you that the Auto Idle Stop function is in operation. Honda says the lack of heat is part of a problem involving excessive engine oil dilution, and announced a vehicle update campaign in late 2018 that was supposed to fix it. The update included new Dxx0A.