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Thanks yet again, CB, and appreciative for the response. On the circuit testing, I can only rely on what my transmission guy indicated he did. They said they took the external transaxle wiring harness and tested all the connections, wiggle and contorting the wire and indicated no issues. No...

Thanks CB for the prompt reply, again. I have every confidence you're correct but my scanner tool doesn't seem to differentiate on a diagnosis and refers to PCM. Interestingly enough, my scans have no longer thrown a DTC P0172. Once the scanner links it immediately reads the VIN correctly...

So, first off, I hope everyone had an enjoyable holiday season and Happy New Year to all. I still don't appear to have all the right solutions but seem to be getting closer. The quick updates are we worked through the electrical and all connections to the transaxle, grounds, PCM are intact...

Actually, I have used LKQ before in my local area. What they wanted was far in excess of what I could get through other avenues.

No doubt. I took a pic of his response, texted it to my transmission guy, went down there today to discuss and they corroborated what he said. The air bag sensor as I understand isn't tied in electrically to the PCM on my Lacrosse as it is on a Jeep. But we did follow the wiring coming off the...

Clinebarger, Thanks for the detailed reply back on this. The last time the scan tool was connected up and we had the delayed downshift, it didn't throw ANY codes. No trouble whatsoever for a few days, then yesterday, started the car, and got an air bag light. Backed out of a parking space, put...

Update for the group here. I read several references to Dave, a tech at Triple Edge Performance and a primary source of knowledge specifically on the 4T65E. Great guy, a few emails back and forth, he thinks as we do the problem is outside the transmission and likely the wiring. If the PCM is...

Thank you atikovi. When I was in the market earlier this year I only saw a few used on eBay, elected to get a new one even if it was Chinese. To see one for $140 w/free returns is excellent and will surely keep in mind.

Thanks atikovi. I actually still have the old throttle body we took off originally. Worth a shot and I'll mention it on Monday. It actually concerned me when we did a search for the throttle body. No domestic parts retailer carries them for a 3.8. You can find the 3.6L all day long. The only...

New member here. I found this website and forum in a search of issues with a 4T65E transmissions. Whatever help, guidance and referrals you can give me are truly appreciated. A lot here but will try to be brief as possible. I have a 2006 Buick Lacrosse V6 3.8L w/4T65E tranny, now at ~77k...