PLEASE NOTE: Some GM vehicles, like the Pontiac Torrent, use a transaxle oil life monitor. The computer calculates the useful life left in the ATF. When the useful life falls below 10%, the "Service Engine Soon" comes on and code P1868 sets. ONLY USE T-IV, GM P/N 88900925 ATF in this transaxle. Do not use Dexron III or Dexron VI as shift quality will be compromised. Don't forget to reset the oil life monitor after a fluid change or transmission rebuild/replacement. You will need to use a scan tool to reset the oil life monitor.
The AW55-50/AF33-5 transmission has adaptive learn strategy. Whenever the TCM is replaced, valve body is replaced, transaxle is replaced or rebuilt, or software is upgraded in the TCM, the adaptive relearn procedure must be performed. Chevrolet Equinox and Pontiac Torrent require a scan tool to initiate the relearn procedure once transmission oil temperature reaches 150°F. Clear old shift adapts and initiate the relearn procedure with the scan tool, then adapts can be relearned as follows:
The scan tool of choice for GM is the Tech 2. The Tech 2 works on Saturn vehicles too. There is a manual relearn procedure that can be used on Saturn if a scan tool is not available. With key off, "brain dead" the TCM by disconnecting both battery cables (remove negative cable first) and connecting them together. Turn on some electrical components like headlights and heater fan to drain power from the TCM. If you turned the key on to drain the TCM, make sure you turn the key off before reconnecting battery. Reconnect the battery (positive first, negative last). By draining the power from the TCM, the adaptive learn is cleared to the default level. You can then perform shift adapts as shown above.
It's always a good idea to check to see if the computer has the latest software upgrades. On GM vehicles this is made easy for the aftermarket technician. All you need is the software calibration number which can be retrieved by your scanner and the VIN #. Go to the FREE GM calibration web site, enter the VIN # and all of the software upgrades that are available for that vehicle will appear. Check to see if your calibration # is current.
GM, Early, “A” or No Letter Casting
GM, Late, “B” or “C” Casting, without B5 Spring
GM, ’05-Later, with B5 Spring
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