Hi all,
I have a 2006 Silverado 1500 RCSB 2WD with a L59 5.3L with cam and long tubes and now a junkyard stock 4L80e from a early 2000's 2500HD that I threw in place of the 4L60e I fried. I thought I was going to be doing a straightforward segment swap, so I spliced in input speed sensor wiring from the pcm to the transmission and instead of re-pinning the transmission connector, I bought a cheap adapter connector. I fired it up yesterday on the 4L60e tune to verify fluid level and reverse and drive engagement, both of which worked. After that, I began looking for a good stock 4L80e file to proceed with the segment swap. I discovered that my OS # 12619623 was never used with a 4L80e transmission. Instead of buying the conversion adapter harness, I decided to search for a 2006 year tune file featuring a stock 4L80e and found one using OS # 12587811 from the tune repository, which I believe is from a 1500HD. I copied my engine tune data over and left the transmission tables alone. I flashed the file over to the PCM. I went into the change VIN wizard and put my truck's vin in it, flashed it again. I tried starting the truck and was greeted with "Reduced engine power" displayed on the DIC, and no crank, no start conditions. Also noticed that the PRNDL doesn't switch positions when moving thru the gear range. I was able to connect to VCM scanner and check for codes and found the following:
P0606
P0622
P1631
U0107
To top it off, now when I try reading/writing to the PCM, it wont allow me to read/write and I'm greeted with the following message: Download boot loaded: Request download x7F Negative response code.
Should I have done a VATS relearn to the truck after changing OS? That's the only thing I didn't think of before shutting down the shop for the night.
I've been trying to search info on what I have going on but haven't had much luck, so figured I'd post before pulling anymore hair out of my head! Thanks
4L80e swap OS with L59 Engine Tune.hpt