Join Date: Aug 2015
Location: Las Vegas, NV
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No codes could be a transducer/governor solenoid. Forget that they are almost new, that can literally mean nothing.
Also, if you installed the billet second gear servo, and it seems as though you did based off your upgrade list, that could be causing your issue. Suncoast claims to have designed their second gear servo to work correctly and allow second gear release quickly like OEM, however, I cant back that claim up or down. The second gear release not being the issue, but a broken spring or other problem with the servo may be causing the issue.
Also, check the band lever, anchor and strut. Any one of those not in correct order will cause a second gear issue.
The band may have also broke. If it's the stock one, I believe they are prone to breaking from higher apply pressures.
Sounds like you will need to drop the pan one way or another.
And maybe the valve body.
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