94 LT1 A4, randomly on startup it will throw the code and be in 3rd gear. It will not shift at all in OD, it will manually go through third, but not 4th. I can have my laptop on scan and clear the code and it will shift properly. After the code has been cleared and the key stays on it never throws the code again untill the key is turned off. I have no other codes and this is the only issue . Any thoughts???

 

Always use Shoebox's LT1-specific code list (click on the transmission tab at the bottom of the page):

http://shbox.com/1/Dtcs.htm

DTC 81 = 2-3 Shift Solenoid Circuit Fault

Parameters:
-2-3 shift solenoid is commanded ON by PCM but circuit voltage is high for two seconds
OR
-2-3 shift solenoid is commanded OFF by PCM but circuit voltage is low for two seconds

PCM Default Response:
*No TCC
*Maximum line pressure
*Second or third gear only

Appears you may have a faulty 2-3 shift solenoid.

 

Thanks for the link. I looked at the codes but didnt notice the trans tab at the bottom. Ill try a new solenoid and see if that fixes it. Thanks again.