Im getting a "x7F Negative Response Code" when i click read vcm.

I believe this is before it asks me to apply credits.

 

This is a Trifecta tune. They locked the VCM.

You will need to contact them to find out how to remove the lock.

At least you now know what's on the car.

You should still be able to run VCM scanner and log the car. But you won't be able to read/write PCM files.

I belief some people have had luck getting ahold of the stock or GMS1 HPtuners file and doing a Write Entire to the car, but not sure if i'd try it.

FROM HPTUNERS:
b. Trifecta tuned pcm's will NOT read out. They tunerlock their pcm's
c. To fix a trifecta tuned pcm you'll need to either use their handheld flasher to flash back to stock, this SHOULD work, though I don't believe its been tested yet or flash it to a 2011 VIN/os via MDS or similar and then flash it back to the correct VIN in order to fully overwrite the OS.

 

Try to email them and see if they have your tune with your vin. You will still need the cable, it's a red tractrix cable I believe. Sucks that they lock it.

 

I dont have a trifecta cable. I'll try flashing back to stock this weekend when i have time to mess with it.

I found stock tunes on the hptuners website.

 

Make sure your car is stock or see if it's gm stage 1. You need to copy your VIN to the new file I believe

 

I emailed with trifecta. Other than telling me the car was tuned by them in the past, they were not helpful at all. I won't be doing business with them.

How would i go about doing this? what is MDS?

I had the GM dealer flash me back to stock today. It seems to get farther along in reading the pcm, but still giving me an x7f error.

how can i change the VIN number on a tune file?

 

You flashed it back to a stock tune and your still running the 3 bar sensors?

 

I told them if they had the gms1 tune that it would work the best. I suspect it's a stock tune though.

To be honest, i expected this to work and didnt really care, as i would then be able to adjust things as needed.

 

That's what my car does.. Some times I'll get limited to 4-5 psi.. While other times it maxs out at 30 or 40 when I hit the gas hard.

 

30 or 40, uh that's not right.

 

if I purchase unlimited '09 VIN's from hp tuners will it allow me to upload to an "unlicensed" ECM?

trying to figure out how I can get out of this mess.... lol.

 

I will let the tuners weigh in on this because it's above my head. Sounds like you need someone to tweak things anyway. And I'm pretty sure your ecu has to have credits applied to it to not be unlicensed, so you can download to it.

 

I think my car is tuned.. When I turn traction control off, the power I get is insane. The boost will be up in the 15 area in first and second.. Where as with traction control on, I won't see that.. Its like a whole different car when TC is off.