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Road trip delayed

2296 Views 9 Replies 7 Participants Last post by  Turtlestar7, 
qn215
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Well was supposed to be on my short road trip already but the start/stop indicator light is on AGAIN. Was replaced the first time maybe a little over a year ago. :mad: Maybe it is time to start shopping for the new Sienna.

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freddief73
qn215 said:
Well was supposed to be on my short road trip already but the start/stop indicator light is on AGAIN. Was replaced the first time maybe a little over a year ago. :mad: Maybe it is time to start shopping for the new Sienna.

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So, why was the road trip delayed? :)

Stop/start (aka ESS) isn't an essential feature. Disconnect the negative cable from the aux battery and get both batteries tested. If the main battery tests good, leave the aux disconnected and go anyways.

I pity anyone that needs major repairs (probably waiting a long time for parts) or is being forced into buying a new vehicle right now. There isn't much to choose from, and what is out there is overpriced due to short supply.
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freddief73
qn215 said:
Alright Fanboys, both batteries passed heavy load testing so it’s not the battery. Now the car start/stop is semi-working but shutting off the accessories as well. They are checking relays now.
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Elaborate on the "semi-working but shutting off the accessories" part. What exactly isn't working and when? IMO they should've had it diagnosed by now unless it really is a more complex issue. I can speculate all I want, but I'm not the guy working on it.

Unfortunately, you're at the mercy of their skill level at this point. Hopefully, they were knowledgeable enough to disconnect the batteries before testing them. It sounds like they were because ESS wouldn't be functioning at all unless they did. The codes will tell them what's wrong/where to troubleshoot further. If things aren't working, codes will most definitely be triggered.

ESS can be disabled for a few reasons, but it's almost always caused by a weak battery (which usually triggers code P00FD - Battery B State Of Charge Performance). Although the code refers to the aux battery, the main battery can still cause it because the two are connected together. The charge of one can and will affect the other. A bad hood switch is the next likely cause, but is pretty rare. When code P00FD is active, only ESS is disabled.
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