Auto Start/Stop fail!!! Anyone experience this?

[Timex]

Update: dealer says the starter solenoid is melted due to a loose wire. 3 day lead on the part. Hopefully it will fix the problem; skeptical- I don't see what the solenoid has to do with all the messages when I hook up a trailer.

 

[sfadchi]

Update: dealer says the starter solenoid is melted due to a loose wire. 3 day lead on the part. Hopefully it will fix the problem; skeptical- I don't see what the solenoid has to do with all the messages when I hook up a trailer.

I know this is an old post, but I'm having the same issues. I did do a little off-roading, hit some mud and water. Since then it's not starting back at red lights, the remote start doesn't work 75% of the time, and I have to push the button 3-4 times to get the truck started. Taking it to the dealer tomorrow.

 

[bo1966]

not me, Mine has been awesome. I love the start/stop...every time Im at a light I realize how much gas I save. It makes a big difference in city driving.

I'm glad you see results. I've checked mine over 1500 miles. Letting it function and turning it off. In Houston traffic and have seen absolutely zero difference.

 

[zemuron99]

OK, I'm gonna reach out here. I wonder if there's a heat shield near your starter that's improperly installed, or not at all. If your starter is overheating, internal resistance will go up and it will crank more slowly and draw more current. It may be enough added draw that there's not enough left to fire the ignition system and get it to start. I'm not sure how close the exhaust runs to the starter to even know if this is a feasible explanation, I haven't eyeballed my motor that closely yet. Or maybe it's just cranking too slowly to ignite-not sure if the computer has a minimum RPM that the engine must turn before firing the plugs.

I believe you're right, most electronics should power off after a short time. Everything shuts off in mine until I hit the power button and the radio comes back on. The shop should be able to hook an ammeter (ampere meter) in line with the positive power cable to see if there's any residual draw when all is off, and if the baseline draw in full accessory mode is within spec or higher than spec'd.

Off the top those are the only two things I can think of that would result in a slow crank/no start situation.

 

[lightman02]

The auto start/stop will not engage if it detects the battery is below a certain voltage. I have a dash cam that stays on either 12 hours or when the battery drops to a certain voltage. I noticed my auto start/stop was not turning off the engine as much, when I looked at the status it said something along the lines of "disabled due to charging". It will eventually start shutting down the engine again once the battery has a certain amount of charge. There has to be some kind of feedback wire to the ECM for battery voltage/current so it knows when there is enough power to restart the engine.