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Discussion Starter · #1 ·
Hello!

First time testing out our new OBD reader with Torque on a trip to the airport and I went and pulled a bonehead move. I forgot to unplug the reader when parking the car and it's going to be sitting until Saturday evening before its next drive (~65 hours).

My understanding is that the OBD port is always powered, even when the car is off. I would imagine it doesn't draw too much power, but then again a simple light bulb overnight can wipe a battery. Am I going to come back to a dead battery?

Thanks!
 

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Discussion Starter · #5 ·
.00654 milliamps. You should be safe! Mine stays plugged in all the time, but I drive it almost everyday too. It doesn't try to communicate unless the car is running. And there's only one tiny led that stays lit. Enjoy your trip, don't sweat it.

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I have one too and I left it on over a long weekend when the temperature dropped to -35 here. It did not drain my battery enough to give me any problem starting on the following Monday.
Excellent to hear. I wasn't sure if the little dongle kept trying to find a Bluetooth signal or something like that that would drain more than usual.

Last time I parked my car and left obd2 plugged in for about 4-5 days the battery was drained by the 5th day I went to start the car, Hope yours is not the case.
I should have him back up and cruising around on day 3, but I'll be sure to never let it go over that.

Thanks everyone!
 

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I leave mine in all the time. No problems, though I too drive it everyday. If you have a good battery you shouldnt have a problem.

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If you're using the torque app I do believe there's a setting in there to auto power off. Not used it in a while but I remember something being there.

And the good battery doesn't make a difference, trust me. Mine drained out enough over 3 days to not have enough power for a good crank.
 

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If you're using the torque app I do believe there's a setting in there to auto power off. Not used it in a while but I remember something being there.

And the good battery doesn't make a difference, trust me. Mine drained out enough over 3 days to not have enough power for a good crank.
What bluetooth device do you have?

This is the one I have that I did leave on my car for at least three days at -30 temperature.
Amazon.com: PLX Devices Kiwi Bluetooth Wireless Trip Computer and OBDII Scanner: Automotive

It has a little switch on it, so I can leave it plugged in all the time and only need to flick the switch to turn it off.

Also that is when my oil heater split in half (it was metal) and stopped working.

So on the 4th day the Beetle started from a -30 engine block with the battery having been drained some from the device.

I always try to remember to quit my Torque app as I'm getting out of the car, Torque does continue to try to reach the device if left on and drains the phone battery considerably. So perhaps if you left both running it would be why or if you have a different device maybe it's noisy.
 

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I've noticed now during the winter; if i have my elm327 plugged in all the time, the battery is lower and slow to crank in the morning. I pulled it off the obdII port and the next morning; my starter cranked better and it did seem to be battery drain, specifically from the elm327. My elm 327 does not have a external power switch or a auto power off feature; thus, can only assume it is on 24/7 and drains the battery. During the summer and warmer months; I have a left it plugged in all the time and it didn't seem to affect the cranking of the starter speed in the morning, that much, since it is not such a cold cranking situation and doesn't have the thick oil etc. to tax the starter, to the same degree.
 
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