I'm in the same boat, 1999 Silverado with 09373372 PCM trying to switch over to 0411 12212156 PCM. All stock except for a cheap eBay CAI (make sure all the clamps are tight!).
Was getting battery light and lean codes.
Now... I don't know why it took me so long to find out about this but
UniversalPatcher has PCMHammer built-in and can export a generated XDF (even for 09373372!). It's not the prettiest but allows you to look, compare and change things in TunerPro for the 09373372.
Here is my changelog (values copied from 09373372 to 12212156)
Code:
Edit Log for 12212156-fresh.bin created by TunerPro.
**************************************************************************
# Optional
09/22/2022 11:37:21 Flag: B1301 - EGR System Enable changed from Not Set to Set..
# Injectors
09/22/2022 11:37:48 Table: B3701 - Injector Pulse Width Voltage Adjustment changed.
09/22/2022 11:38:12 Table: B4001 - Injector Flow Rate changed.
09/22/2022 11:38:28 Table: B4003 - Injector Minimum Pulse Width changed.
09/22/2022 11:38:42 Table: B4004 - Injector Default Minimum Pulse Width changed.
# Battery/Alternator Charging
09/22/2022 11:42:09 Table: G1207 - Vehicle Platform Options table changed. (Disable F-terminal)
09/22/2022 11:42:27 Scalar: Charging System Control option changed from 0 (0x00) to 1 (0x01).
# Speedo correction
09/22/2022 11:44:38 Scalar: H0103 - Differential ratio changed from 3.727 : 1 (0x3BA2) to 3.417 : 1 (0x36AC).
09/22/2022 11:45:02 Scalar: H0101 - Vehicle Speed Sensor Pulses per Mile changed from 101007 Pulses/Mile (0x6502) to 94308 Pulses/Mile (0x5E4F).
# Disabled VATS and VIN changes not showing
I haven't had a chance to drive it much since the changes but it fixed my battery light and charging issue.
I'll attach the generated XDF file for my stock 09373372. If you generate a XDF from the 12212156 bin you can use the diff tool in TunerPro against your 09373372 bin. You can also download EFI Live and compare the two bins, sometimes you have to change the units to match TunerPro, etc, etc.
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