08 Vortec Max cng

[05lly]

I have a 2008 Vortec Max with a 6.0L that has been convertered to run off
of Compressed Natural Gas as well as gasoline. It is driver controlable to pick
what fuel to run off of. When running on CNG it is setting P069E in the Ecm and P2635 in the Fuel pump control module. I took care of the P069E in the Ecm with Efi, but the P2635 is still commanding the MIL through the FPCM.
Any ideas?

Thanks

[GMPX]

Mmm, interesting.
The problem might be the FPCM is simply sending a turn MIL on request which the ECM is doing, rather than the ECM processing the fault itself, which is why you can't switch it off.
What operating system is the .tun file you are working with?

Cheers,
Ross

[05lly]

yes, that's what's happeing, I can monitor the engine data and see that ECM is commanding the MIL, but not because of a DTC. The operating system is 12617631.

Thanks,

Shawn

[MN C5]

If your interested in sharing any of the details of the CNG conversion I'd love to hear about it. And pictures would be a huge bonus!:cucumber:

[GMPX]

Shawn, I don't think there is going to be much that can be done.

Cheers,
Ross