Tranny "relearns" after disconnection of PCM?? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-13-2009, 12:17 PM   #1
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Default Tranny "relearns" after disconnection of PCM??

Just wondered if the transmission will "relearn" your driving /shifting style after the battery or PCM is disconnected?? Just wanted the tranny to start with a clean slate after clearing previous stored faults/codes that have been addressed...........
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Old 01-13-2009, 12:37 PM   #2
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I believe the PCM resets after about 20 mins without power.
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Old 01-16-2009, 11:13 AM   #3
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As a side note..............I've been chasing a "searching" condition I've been having with the tranny not knowing what gear to change into under load conditions like going up a small hill when in OD..........she "searches" for the right gear before settling into kicking down into 2 and then moves normally..................I found that a short piece of vacuum hose that connects a hard line to the modulator? on the side of the tranny was almost broken in half so I replaced the 2" piece and it "seems" to have cured the problem (fingers crossed) but time will tell.............might wanna check those vac lines as a preventative measure....
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Old 01-16-2009, 08:14 PM   #4
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UPDATE!!.........it was the vacuum modulator line after all...........shifts perfect now......
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Old 01-16-2009, 08:16 PM   #5
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Glad to here. At least it was a easy fix.
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