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Did my PCM get reset?

 
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billy101
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2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sat Nov 06, 2010 3:05 pm    Post subject:  Did my PCM get reset? Reply with quote

Hey, I just installed my hid kit from DDMtuning last night. Had the negative side of the battery disconnected for about 1 1/2 hours, which reset the radio time, etc. Could the PCM have gotten reset? I was driving around town doing different speeds, and different terrain, and everything, put about 75 miles on the car today...anyways.

I was driving around, and for the first 40? miles the car was taking a pretty long time to shift. It would get to the shift point, hesitate, and then shift to the next gear, no issue while downshifting. It would do this through all gears (1, 2, 3, 4). Then all the sudden it seemed to subside...parked to go into panera bread for about 25minutes, and got back in the car, and it drove perfectly...like before this issue arose. I will pay close attention to it while driving around, but it didn't do it at all on the way home.....I beat on it from a red light, (raining out) so the tires spun pretty well, traction control came on, and it hauled ass to 65, with no hesitation through shifts.

Could the PCM have gotten reset? Sorry about the essay I just wrote..

I know about all the problems with the 2000-2005 Impala transmissions, and my car's got 109,302 miles on it right now, with stock tranny and tranny fluid, and it's just needing the UIM/LIM gaskets done. Knock on wood, but this is one of our most reliable cars.
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Frank
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PostPosted: Sat Nov 06, 2010 3:33 pm    Post subject:   Reply with quote

The PCM learns how the transmission shifts over time and adapts...by disconnecting the battery you probably cleared that learning. It should relearn over time and be fine.

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IffyG
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1998 Oldsmobile Intrigue
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PostPosted: Sat Nov 06, 2010 3:34 pm    Post subject:   Reply with quote

Yep, it reset. It'll act pretty wonky for a little bit, but you will be fine. Mine seems to take damn near forever to shift after I have the battery removed. Nothing to worry about.

Edit: too slow

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billy101
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2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Sat Nov 06, 2010 3:59 pm    Post subject:   Reply with quote

IffyG wrote:
Yep, it reset. It'll act pretty wonky for a little bit, but you will be fine. Mine seems to take damn near forever to shift after I have the battery removed. Nothing to worry about.

Edit: too slow


@Frank & IffyG,

Alright, awesome. Was going to be pissed if it started to have tranny problems. After driving it for awhile it ticked into my head that...oh duh it was unplugged and the PCM must have got dumb. I just took it out 10 mins ago for a bunch of 0-75 pulls and it shifted great.

I would also like to note, that on the last tank of gas after I seafoamed I got 25mpg around city, coming from 21mpg city before seafoam.. This car runs great!
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