The other day i changed the TPS.Turned key to on position and heard a clicking noise.I started the car and didnt see a difference.The service engine light came on.I put the old sensor back in.Drove the car later and now it doesnt go into overdrive.Never had a problem before changing the sensor.My scanner wouldnt link to the computer.Took it to the dealer,and there having same problem linking to computer.Is there a fuse that would be blown to cause car not to go into overdrive??The module was changed not to long before i bought the car.Any Help??

 

What module was changed before you bought the car? Do you have the receipt?

 

Engine/powertrain computer/module.It was replaced by previous owner.Its weird ,the car was fine before i changed the tps.It runs fine.just no overdrive.

 

95 was a transition year for GM to OBD 2. I replaced the ECM on my 93 Buick LeSabre years ago and it drove and shifted fine afterwards. Have you tried disconnecting the battery overnight?