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Old 01-02-2015, 10:49 AM
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obd-II dongle PCM drain

Was just told that as long as an OBD-II dongle is in place, the PCM is active and may overheat. Does anyone know if this is true ?

I thought that when the vehicle shut down, so did most of its modules and whether a dongle was connected or not would make no material difference.

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Old 01-02-2015, 11:35 AM
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Re: obd-II dongle PCM drain

I would guess that would be true . . . although I'm still curious if anyone knows for sure . . .
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Old 01-02-2015, 11:59 AM
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Re: obd-II dongle PCM drain

Well I have left in the garage for over a week before so if any drain it cannot be much (low milliamps). Would like to know why that would overheat the PCM.
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Old 01-02-2015, 05:15 PM
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Re: obd-II dongle PCM drain

It is true, there are a few posts about around JG about it, you can get dongles that have an actual on/off switch.
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Old 01-02-2015, 07:10 PM
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Re: obd-II dongle PCM drain

Quote:
Originally Posted by padgett View Post
Was just told that as long as an OBD-II dongle is in place, the PCM is active and may overheat. Does anyone know if this is true ?

I thought that when the vehicle shut down, so did most of its modules and whether a dongle was connected or not would make no material difference.
Wait...your PCM did not come factory fitted with liquid nitrogen cooling? I have been overclocking mine and no overheating yet. It must be the active cooling !
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Old 01-06-2015, 09:06 PM
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Re: obd-II dongle PCM drain

My OBDLink LX goes to sleep after a certain amount of time. The manufacturer says the bus will go to sleep and the power draw is minimal. I've left mine plugged in since I drove it off the dealer lot (July '14) and it has never had a problem or a dead/low battery even after sitting for a week plus.

Now the cheap ELM327 dongles, YMMV......
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