Help with 4l80 segment swap!!!

[EVODRIFTER]

I need help. I just installed a FLT 4l80e and I did the segment swap in my tune but I get codes p0748, p0753 and p0758. I used a Speartech harness adapter.
The truck is a 2003 silverado ss supercharged with L92 heads and a built bottom end. Someone please help.:crash:

[Taz]

There is more to a 4L60 to 4L80 transmission swap than just copying over the Transmission Calibration & Transmission Diagnostics segments - which I assume you did.

In a 2003 truck that was originally equipped with an LQ4 / 4L80 combination - the DTCs you mentioned (P0748, P0753, and P0758) are all set to "C: Non Emissions" - they are not set this way in your tune. These DTCs are also set to "No MIL" in a stock tune.

Comparing your tune parameters with a stock 2003 LQ4 / 4L80 would be a beneficial exercise. Once your tune is more closely configured to a 4L80 - take the vehicle for a drive and confirm gear shifts and TCC operation.


Regards,
Taz

[EVODRIFTER]

Thanks Taz I worked on the tune last night going to try it today and I will post the results.