Transmission Our van has just over 100,000 miles on it and I noticed last week that it seemed to hesitate a little before shifting into the next gear at around 35-40 miles per hour. Now it is not going into gear at all, the more you accelerate the higher the RPM's go, but it never goes into gear so for the moment it basically won't go above 35 mph. Had the basic check engine light scan done and came up with a code suggesting a problem with the transaxle control module. This has been replaced but still having the same problem. Any suggestions greatly appreciated.

The switches inside need to be replaced they are hanging up do this now before you ruin the clutches it will go back to normal shifting and work fine change all pressure torque lockup and shift switches diy for about 125.00 with fluid filter cost and back to normal shifting and a happy van and crew make sure vans not running hot burning fluid otherwise will happen again high temp burned fluid damages switches ability to work

An automatic transmission with 300,000 miles on it should be in some kind of record book it's unheard of !!! It seems counterintuitive but changing the fluid on a tranny with this many miles can be the death knell. I have seen it many times but if you got that many miles out of it was on deaths door anyway. If you are really attached to it don't even think about a junk yard tranny, they will be just a little less worn out that the original in you car now. FYI it's going to be at least 2G's to have it rebuilt.

first check the gear oil or replace it before you change the automatic gear completely

Yes I think you are. Try Firestone or Midas. Firestone changes out ALL of the fluid and not just 25%. 167K miles may be a lot to some people but it is not to a car taken good care of. Remember Cadillac is top of the line for USA vehicles and has higher tolerances.

You may have what is called a syncronizer problem which is basically a transmission rip down and inspection, when the syncros go they create havoc inside the gear box making shifting extremely difficult in these gear ranges.
The other thing that also should be inspected at the same time the transmission is looked at is the clutch assembly, clutches should last long times depending on how each vehicle is driven, generally a clutch can be worn out in as little as 30,000 miles if it is pushed hard as oppossed to a car being babied and lasting 100,000 miles or more.

do a code search check codes on yahoo also go to youtube and finde code search vid

That is a rip off.

A new and more recent car would be better off.

Sell this one and get a replacement instead of spending $8200 for repairs which will not likely end there.

Let the dealer sell it off or trade it in for you.

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Check light on , have codes checked . Transmission not shifting into a gear , could be a shift solenoid . Take your vehicle to a qualified repair shop , before it get's ruined .

I would check the transmission and engine mounts but also it may be time for a transmission fluid change. It has a service interval just like oil. 50000 miles

beginning of transmission problems could be a clogged screen in the transmission filter..making it have to have time to warm the fluid up so it can get through the screen