Cadillac Repair: 96 eldorado, number combinations, service transmission

Question
the check engine light comes on intermittently and says service transmission. the only difference is the tranny shifts a little harder. like it has a shift kit.the light goes off and it shifts smooth again.

Answer
To check for computer codes perform this test:

1. Ignition ON. Engine OFF.

2. Simultaneously push and hold the OFF and WARMER (^) buttons on your climate control panel for 3 seconds and release them.

3. Diagnostic codes will appear as LETTER/NUMBER combinations with either the word CURRENT or HISTORY along with each code.

4. Turn ignition OFF.

5. I need to know what code or codes you see.