$0D and 1998 4L60e

[Marcus]

220* is not normal, might be worth looking at the parameters for trans temp to see how close you are getting.

When failure occur trans temp was 155. After that, driving in 2nd, temperature increase I think was expected.

[brian617]

Ok, gotcha.

Are you checking for codes on the same key cycle that the error occurs, or after having cycled the key?

[Marcus]

Ok, gotcha.

Are you checking for codes on the same key cycle that the error occurs, or after having cycled the key?

I'm doing log, so I check codes all the time. Never came a code...

I have a new lead. When the failure occurs there is a record of "Manual Pattern Requested" in log. A TFP switch failure is possible. I'll remove the pan to check.

[Marcus]

Update:

I think I found the problem. An intermittently defective TFP switch. When cold, switch D2 (N/C) is ok. I believe when hot it opens regardless of oil pressure on it. The PCM does not see an error as it seems to be a manual action by the driver. It's still not clear why the pressure stays at 100 pounds in that situation.
Anyway a new switch seems to have solved the problem. The truck is running very well and had no problem when hot.
On this test drive I couldn't feel any problem with the 3-2 solenoid. TECH2 indicates a fault when the solenoid is commanded OFF but this does not generate a PCM fault code.

I thank the friends who gave some feedback around here.
A happy Christmas with health and a prosperous new year!

Marcus