My 2002 GCS had a Bumping Downshift since I purchased it in 2010. It came and went at random being a mostly rare occasion.

In the last 6 months it would do it 50% of the time. The higher speed from, and faster the rate I slow her down from, the harder the bump.

The solenoid pack was leaking and I swapped it several days ago. The downshift bump was more consistent but less severe. I have put a couple hundred miles on it since the change. From what I read the solenoid pack is not a turnkey cure for the bump and but I was hopeful all the same. The leak is gone however.

Today I took it to my transmission guy and he did the re-learn with a Snap-on-Tools device. I seen him out there backing it up and pulling it forward as I conversed with others.

Holy moly its a different van! She runs out so much smoother now and I didn't realize the van used to up-shift kind of like it had a shift kit in it until today. It wasn't harsh but I knew when it shifted through the gears.

When I first got on the highway and normally wound it out I was kind of concerned because I was still waiting for it to shift.
But I knew something was up because it would be red lining the Tach if it had not shifted yet because I was going 55.

Then came the red light. No bump. Nothing! Up shifting is so smooth one almost has to monitor the tach to know it shifted. All thew way home as I drove it I was like - WoW! What took me so long to get that done.

 

The dealership has recommend that we replace the solenoid pack on my wife's 2002 Caravan with the 2.4L... I am capable of replacing the part myself but from what i understand from Alldatadiy is that if I replace it it will need to be "quick learned"

Is this correct, I will need to have it done at the dealer or tranny shop, or is there a field learn procedure I can do myself?

If I do the replacement will I be able to drive it to have it done?

I just paid the dealer $100 bucks to turn off the Brake/ABS/ trac off on the IP, I'd have to spend another C note for them to quick learn... the van is in very good shape but too many 100 here and 100 there, and we will be at its blue book value ack!

 

Some senior members here say you can just drive it and it will eventually learn or really never need it. A transmission shop with the correct scanning device can do it and it should be at a competitive price but who knows.
In my case it was a great improvement in how it runs out. I did the pack because of a leak.

 

I went back by the transmission shop to give praise and we spoke of the "To re-learn or Not To re-learn" subject.
He says always choose to do so. The computer gets set to go by a certain clutch volume index and the relearn helps it match up to what your trans mission is doing in that area.
Worked for me, $20.00.

 

A cynic would say it's in the shops best interest to promote coming in for the quick learn but at $20, to me it's a no brainer. Some shops charge much more. There is a manual procedure to perfrom a quick learn without a scan tool out there somewhere on the net.

 

I would agree, I am good with $20-$40 for the service of plugging something in and pressing a couple of buttons...
Thanks for the responses I will follow up with what I do, right now I have a couple of tie rod ends I need to replace on it that I will do when the weather is a bit better...

 

I know it’s been several years but did the bump return after driving awhile?