Sorry, I can pull it up in an IVR, but I can't get to it in Service Information.. Below is your rpo codes in case that makes you feel any better.. lol..
L76 does show up as an engine in a 2009 Silverado, not 2010 though.. Below is the power ground schematic, that has everything you should need to get the ECM to wake up and talk..
Circuit 18(D blue) isn't needed to talk ,but it gets ignition power from the key and signal is passed thru the BCM..
Pretty sure Circuit 47(Pink/blk) isn't needed to talk either
Vehicle Information
VIN: 6G1EP4EY3AL420001 Model: 8EP80-2010 VE - COMMODORE
Service Contract: No Branded Title: No Warranty Block: No PDI Status: No
Order Type: N/A
Field Actions: 0 Open
Vehicle Build
Model: 8EP80-2010 VE - COMMODORE Order Number: 3443147
Gross Vehicle Weight: 0 Build Date: 11/19/2009
Build Plant: L
Option Codes
*IVH is not the definitive source of GM Vehicle RPO information and is intended for service reference only. Should there be any questions about the vehicle's original build or RPO information please refer to the original vehicle invoice or window sticker.
DMAT - Carpet Floor Mats - Set of 4
AFI - INTERIOR TRIM CONFIG #9
AG5 - ADJUSTER PASS ST MANUAL, 2 WAY
AH6 - ADJUSTER SEAT, POWER, 4 WAY, V
AM1 - CONTROL SEAT, MANUAL LUMBAR, D
AM2 - CONTROL SEAT, MANUAL LUMBAR, P
AN6 - RESTRAINT PROVISIONS CHILD - A
AQ9 - SEAT FRT BKT, LUXURY
ATG - LOCK CONTROL, ENTRY REMOTE ENT
AXX - VEHICLE TYPE VEHICLE TYPE - NO
AX2 - KEY COMMON, VEHICULAR UNIQUE
AY0 - RESTRAINT SYSTEM SEAT, INFLATA
CJ2 - HVAC SYSTEM AIR CONDITIONER FR
CX5 - COUNTRY AUSTRALIA
DL6 - MIRROR O/S LH & RH, REMOTE CON
DV5 - CLUSTER COLOR INST, SILVER GRE
EOF - INSULATION ACCOUSTIC PACKAGE,
ESA - PLANT CODE ELIZABETH SA, AUST
EVG - EQUIPMENT ENGINE, V8 E20 - HANDLE O/S, DR, CHROME
FCP - TRIM DOOR POLYPROPLENE FE2 - SUSPENSION SYSTEM RIDE, HANDLI
FGI - TRIM SEAT LEATHER, FINE SPOT P
GW8 - AXLE REAR 2.92 RATIO
G80 - AXLE POSITRACTION LIMITED SLIP
JF5 - PEDALS SPORTY, ALLOY
JL4 - CONTROL ACTIVE BRAKE
JL9 - BRAKE SYSTEM PWR, FRT & RR DIS
KG9 - GENERATOR 140 AMP
L76 - ENGINE GAS, 8 CYL, 6.0L, SFI,
MX0 - MERCHANDISED TRANS AUTO PROVIS
MYC - TRANSMISSION AUTO 6 SPD, HMD,
NK4 - STEERING WHEEL SPORT LEATHER
NT3 - EMISSION SYSTEM EEC 00
N10 - EXHAUST SYSTEM DUAL
N40 - STEERING POWER, NON-VARIABLE R
QCZ - TIRE ALL 245/40R19-94W BW R/ST
QQ5 - TIRE & WHEEL SPARE, FULL SIZE,
QS4 - WHEEL 19 X 8 ALUMINIUM RHD - VEHICLE DRIVE RIGHTHAND DRIVE
T3U - LAMP FRT FOG
T4A - HEADLAMPS HALOGEN
UDC - DISPLAY INSTRUMENT DRIVER INFO
UEN - SENSOR INDICATOR SEAT BELT, FR
UPG - WIRELESS INTERFACE SHORT RANGE
UQG - SPEAKER SYSTEM ENHANCED AUDIO
UWP - RADIO AM/FM STEREO, SEEK/SCAN,
U71 - ANTENNA ROOF, RADIO
VY7 - KNOB TRANS CONT LEVER, LEATHER
V68 - VEHICLE STATEMENT AUSTRALIA
WEH - SALES PACKAGE G8 PACK
XL8 - FREQUENCIES RATING 433 MHZ
XW6 - PAINT FINISH METALLIC
02D - TRIM COLOR SEAT ONYX
1A6 - TRIM COLOR DR PANEL ONYX
6X1 - COMPONENT FRT LH NON-COMPUTER
7X1 - COMPONENT FRT RH NON-COMPUTER
8X2 - COMPONENT RR LH NON-COMPUTER S
9X2 - COMPONENT RR RH NON-COMPUTER S