how to reset PCM

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Oct 14, 2023 | 05:38 PM

Justinh

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Joined: Feb 2014

Posts: 468

From: north Alabama

how to reset PCM

I've read on this forum that removing power from the PCM is not enough to reset it. So then how is it done? Is it possible to get the adaptive learning values back to default?

Oct 14, 2023 | 07:50 PM

hummerz

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Joined: Jul 2012

Posts: 8,907

From: C-Town

Quote:

Originally Posted by Justinh

I've read on this forum that removing power from the PCM is not enough to reset it. So then how is it done? Is it possible to get the adaptive learning values back to default?

Disconnect battery cables, after disconnect, jump in with KOEO, use controls: headlights ON position, turn signals ON position, step on brake pedal so lights are in the ON position, radio/hvac/shifter/door lock/windows etc to drain residual power, take your time and wait until you get to 0.00v.

Oct 15, 2023 | 08:10 AM

Justinh

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Senior Member

Joined: Feb 2014

Posts: 468

From: north Alabama

0V where, across the battery cables?

Oct 15, 2023 | 04:31 PM

hummerz

Senior Member

Joined: Jul 2012

Posts: 8,907

From: C-Town

Quote:

Originally Posted by Justinh

0V where, across the battery cables?

0.00v @25

Oct 16, 2023 | 07:16 PM

Justinh

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Senior Member

Joined: Feb 2014

Posts: 468

From: north Alabama

Thanks.

Oct 17, 2023 | 08:58 AM

Doc Olds

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Joined: Jul 2007

Posts: 13,056

From: Boat Town USA MI

You cannot "reset" a PCM. You can reboot it, but it will retain the last 300 ignition cycles, power or no power.

The only way to change what is in the PCM flash based memory is to over wright it.