My Pilot produced a code the first time it stalled after auto stop. I'll copy everything from the invoice here, but am not an expert so might be including something not relevant...
P17OB - DOG CLUTCH A ABNORMAL OPERATION
U0230 - GAUGE LOST COMM W / PTG
U1281 - GAUGE LOST COMM W / MICU
U0199 - MICU LOST COMM W / MASTER SWITCH
U0180 - CLIMATE CONTROL LOST COMM W/ MASTER SWITCH
This I assume is the mechanic's notes: INSPECTED FREEZE DATA, TRANS HAD NO INPUT SPEED, SO CODE MUST HAVE SET DURING AN IDLE STOP. FOLLOWED TROUBLESHOOTING-INTERMITTENT FAILURE, CODE IS NOT RESETTING. TEST DROVE VEHICLE, IDLE STOP IS OPERATING PROPERLY AT THIS TIME.
Question for those of you also having this problem: Have you noticed if it seems to matter how long the idle stop has been engaged? We think both times ours stalled it had barely turned off for the idle stop when we tried to get moving again.
Now for my lengthy description/rant. We're first (and probably last!) time Honda owners and have been experiencing the idle stop stall. All along I have felt that our 2017 Touring doesn't always restart from the idle stop smoothly. Often (but not always) it would hesitate when I was trying to get moving again, and then I would feel kind of a big effort as it finally kicked back on. This is the first vehicle we've had with the feature, so I figured that must be normal. At about 31,000 miles (June 2020) it died on me in a parking lot when I released the brake after the idle stop had engaged. It took a flustered moment before I ultimately was able to restart the vehicle. A week later I took it to the dealership for an oil change and to investigate this issue. Their response was that they found a code but not a problem. They said they cleared the code and to bring it back if it happened again. Two months later (Aug 2020) it happened again, only this time my husband was driving in stop and go traffic in the middle lane of I-5 through Portland with our kids in the backseat. Traffic started flowing again but here we were completely stuck as traffic began fanning out to go around us. This time it seemed to take longer to get the car restarted. After this we tried to remember to disable the feature each time we started the vehicle. On Sept 4 we brought the vehicle back to the dealership as I had been instructed. Several hours later we got a call saying the car was ready to pick up. We had to press the person for more information, only to be told that it was working perfectly and there was no problem. In other words, we were out of luck because they couldn't replicate the problem. The tech(?) sarcastically said he could keep it for days or weeks or even months and keep driving it around, but nothing would happen because it was fine. He claimed they can't even try to find a problem if they can't replicate the issue first because the warranty won't pay out. We even told him there had been a code two months before, and he said that could mean anything. FINALLY he looked up our service record (not sure why he wouldn't have done that already?) and after reading the codes/notes hist tone changed. He offered to talk to his manager the following week to see if they could contact Honda. This was right before the long weekend so we were told we'd hear back on Tuesday. Unfortunately by Tuesday morning a nearby wildfire had knocked out power so we got a quick call saying they were closing. Now it's the following Monday morning and we still hadn't heard so called them ourselves. Turns out they had reopened 4 days ago but not fully staffed due to smoke issues. The guy we talked to looked at our case and said it's ready to be picked up! But of course they hadn't even looked at it again yet. Help from the dealership is definitely not looking promising. We just submitted a NHTSA complaint. I hope everyone with this issue does. This "can't replicate so your vehicle is in perfect condition" response is ridiculous, especially involving a safety issue. This is our family car that I typically drive alone with the kids. I can't put us in danger of being rear-ended because at any moment the car might not restart when the situation would make any cars behind me assume I should be moving (plus I would think my brake lights would go off since I have released the brakes expecting to start moving). We will have to just remember to disable that feature, but how do you explain that if we want to sell the car eventually? And why should we have to accept our vehicle not having the all the features we were sold? It is still on original warranty, but we did buy the extended warranty with the expectation that any issues that arise would be covered. If this is how Honda treats customers we definitely won't be one again.
