Cadillac Repair: Cadillac problems, cadillac sts, number combinations

Question
QUESTION: I own a 1996 Cadillac STS in which the "Service Engine" light stays on and the "Service Transmission" light comes on all the time (service code 100).  Also, when I start my car it jumps forward.  Can you tell me what I should do?

ANSWER: There is NO service code of 100. Where are you seeing this number.?

---------- FOLLOW-UP ----------

QUESTION: The "Service Transmission" comes on where you check your mileage, oil life, etc. and after it shows up it says "EXP 100".  I thought that was a service code.  Where do I find the service code?

Answer
The FIRST thing you have to do is retrieve the CODES from the computers.

1. Ignition ON. Engine OFF.

2. Simultaneously push and hold the OFF and WARMER (^) buttons on the climate control panel for 3 seconds and release them. On the fuel data display letter/number combinations will appear such as PC0327 along with the word HISTORY or CURRENT.

I need to know what codes appear and if they are current or history and then the screen will stop and display PCM?

I need the codes in the EXACT order as if you were video taping them.