I've bees messing with this for over a year and a half and I need some help, Please!!. I have LS2 90mm w/ the necessary TAC module and harness and I still intermittently get a P0220 code at start up. If I clear the code after the vehicle is running it does not reset. When I snapshot the problem it appears that the TAC module zeroes out all the APP and TPS voltages for .14 seconds. The spec for voltage out of range is .1 sec. I think the problem is in the tac module (powering up too slow). I would like some feed back from others if they have ran into this. Thanks!!!!!

 

If its a car TB thats your problem. You need a truck 90.

 

Only Trailblazer SS 90mm work for this?

 

I have a Vette 90mm on mine. It's never coded on powerup/start. Only issue I've had is with water in the connection and throwing a code, reduced power with big throttle input.

 

I have seen where people have a lot of troubles not using the truck TB. Not saying thay cannot be ironed out but there is more luck with using the truck version.

 

The truck/LS2 TB are the same other than the housing. You can put one on the other and the vehicle will not know the difference. I think you have some other issues that would be next to impossible to diagnose via the web.

 

What is the part number for the proper tac module for this set up?

 

TAC Module Part number I'm using is 12574221

If its intermittent I would think connections or a flaky TB?

 

P0220= High Ref circuit 2 below .29V or above 4.6V for 1 sec I believe.
Any other codes set or just P0220? Make sure you don't have any internal breaks in the wiring near the connector or shorts between any of the wires.

 

Same here,...never an issue.