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Old 05-21-2010, 04:23 PM
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1994 Sts

Hello, I have a problem that includes when I cruise about 60 km/h, my 1994 Cadillac Seville STS 4.6 L (9) has problems shifting into 3rd gear (will not shift at all), it just keeps reving like its in neutral and moves the car back and forth. I have tried your technique to find out the codes, i got these codes: PO76 History, PO86 History, NO IPC, AO37 History, NO SIR, TO73 Current, TO72 Current, SO36 History, SO38 Current, SO44 History, SO60 Current, SO61 Current, PCM?

Thank you for your help.

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Old 05-21-2010, 10:35 PM
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Wow man, you will need to learn to be an electronics guru on this rig. If you don't have a description of these codes and an understanding of electrical diagrams and understanding electricity and the way the modules communicate or the logic they use. The car will never be right.

But, I can say this. With, the traction control codes. The transmission will make a 2nd gear start. And with the code po86 (undefined gear ratio)... Probably, someone has already slammed a used transmission in it, with the wrong gear ratio, for the computer. So, it might be a tough battle, even for the best. JMO, Good luck
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