GM RPO Code Database

Search the code list

24,366

codes on file

51,776

documented meanings

1973–2026

model years

Type a code, or describe the option in words. Every entry says where the meaning came from and which years we hold it for, because an RPO code can mean different things in different eras and a list that hides that is worse than no list.

Code or description

Model year

Sourcing Any From a GM document Corroborated GM option master, dated General reference Provisional

Search

The full list, A to Z

Showing 1–100 of 741 codes beginning with G. One meaning shown per code — the best-sourced one we hold. Search above for the rest.

Code	Meaning	Years	Sourcing
G01	Package Trim Level 1	—	Reference
G02	Package Trim Level 2	—	Reference
G03	Package Trim Level 3	—	Reference
G04	Package Trim Level 4	—	Reference
G05	Package Trim Level 5	—	Reference
G06	Package Trim Level 6	—	Reference
G07	Package Trim Level 7	—	Reference
G08	Package Trim Level 8	—	Reference
G09	Package Trim Level 9	—	Reference
G0S	Realtree Special Edition	2025	GM sourced
G11	RATIO, TRANSAXLE FINAL DRIVE 2.56	—	Provisional
G12	P, SSR, M, SUSPENSION REAR, 12,000 LB (5,450 KG), AIR, 607	—	GM sourced
G1A	P, FIN, R, FLEET INCENTIVE, BEAUTICONTROL COSMETICS (C/K/N/U/W-TRK CK)	1999	GM sourced
G1B	Primary Color Exterior, Fusion Gray Met(400y)	—	Reference
G1C	Primary Color Exterior, Overcast Met(402y)	—	Reference
G1D	Primary Color Exterior, Royal Flush Blush Met(404y)	—	Reference
G1E	Primary Color Exterior, Limited Addiction Red Tint (405y)	—	Reference
G1F	Primary Color Exterior, Burnished Brandy Met(406y)	—	Reference
G1G	P, FIN, R, FLEET INCENTIVE, GALLAGHER BASSETT SERVICES, INC (B/N/U/W), 10912	—	Provisional
G1H	Primary Color Exterior, Orange U Tempted Met(408y)	—	Reference
G1I	P, FIN, R, FLEET INCENTIVE, THE MCGRAW HILL COMPANIES, INC (C/H/J/N/U/W-, TRK GJMLST), 20801	—	Provisional
G1J	Fleet Incentive Hartford Steam Boiler Insp & Ins (l/n Trk-mst)	—	Reference
G1K	Primary Color Exterior, Sacr'e Blue Met(409y)	—	Reference
G1L	P, FIN, R, FLEET INCENTIVE, KENDALL ELECTRIC (H/N/U/W-TRK CKG), 10807	—	Provisional
G1M	Blue Velvet Metallic	2020	GM sourced
G1N	P, FIN, R, FLEET INCENTIVE, AUSTIN POWDER COMPANY (W-TRK CKST), 20513	—	Provisional
G1P	P, FIN, R, FLEET INCENTIVE, SEPRACOR INC. (B/H/U/W-TRK ST), 20422	—	Provisional
G1Q	P, FIN, R, FLEET INCENTIVE, ALFA LAVAL, INC. (C/D/G/H/N/W-TRK CK), 20912	—	Provisional
G1R	P, FIN, R, FLEET INCENTIVE, RUAN LEASING COMPANY (H/N/W-TRK CK), 11008	—	Provisional
G1S	P, FIN, R, FLEET INCENTIVE, MIRK INC. (TRK CK), 11029	—	Provisional
G1T	P, FIN, R, FLEET INCENTIVE, SANKYO PHARMA (H/U/W), 11002	—	Provisional
G1U	P, FIN, R, FLEET INCENTIVE, NICHOLS CONSTRUCTION (W-TRK CKML), 10522	—	Provisional
G1V	P, FIN, R, FLEET INCENTIVE, GAB ROBINS NORTH AMERICA, INC. (S/W-TRK CKGMLST), 20801	—	Provisional
G1W	Primary Color Exterior, Abalone White Tricoat(140x)	—	Reference
G1X	P, FIN, R, FLEET INCENTIVE, CONSOLIDATED ELECTRICAL DISTRIBUTION (H/N/U/W -TRK CKGMLST), 20820	—	Provisional
G1Y	GVWR, 11,500 lbs. (5216 kg)	2026	GM sourced
G1Z	P, FIN, R, FLEET INCENTIVE, OWENS CORNING (W-TRK CKG), 10920	—	Provisional
G20	P, FIN, R, FLEET INCENTIVE, THRIFTY CAR RENTAL OF ORCHARD PK, NY (H/J/N/W), 20222	—	Provisional
G21	P, FIN, R, FLEET INCENTIVE, DOLLAR TREE STORES, INC (U), 20611	—	Provisional
G22	Primary Color Exterior, Sea Grass Met (200x)	—	Reference
G23	P, FIN, R, FLEET INCENTIVE, WESTERN SURETY (W)	1999	GM sourced
G24	P, FIN, R, FLEET INCENTIVE, INSULATE AMERICA (C/D/G/H/K/N/U/W-TRK CKGMLST), 20912	—	Provisional
G25	P, FIN, R, FLEET INCENTIVE, INITIAL SECURITY (B/N/W-TRK JMLST), 21016	—	Provisional
G26	P, FIN, R, FLEET INCENTIVE, ROYAL CARIBBEAN INTERNATIONAL (C/D/K/W-TRK CKST), 20801	—	Provisional
G28	Axle Rear 46000 Lb, D46-170d, Single Speed	—	Reference
G2A	P, IDT, M, TRIM, CLOTH, TORTELLA, 126	—	Provisional
G2B	P, IDT, M, TRIM, CLOTH, ZEBRA, 126	—	Provisional
G2C	P, IDT, M, TRIM, CLOTH - VENT, 228	—	Provisional
G2D	P, IDT, M, TRIM, CLOTH - BOGUR, 228	—	Provisional
G2E	P, PNO, M, PANEL (OPEL), TRIM, INNER, STRIPES UNI, 306	—	Provisional
G2F	P, PNO, M, PANEL (OPEL), TRIM, INNER, ELBA UNI, 306	—	Provisional
G2G	P, PNO, M, PANEL (OPEL), TRIM INNER, TEXAS, 10117	—	Provisional
G2H	P, IDT, M, TRIM, CLOTH - CORA4, 11129	—	Provisional
G2I	P, IDT, M, TRIM, CLOTH - LUCAN, 11129	—	Provisional
G2J	P, IDT, M, TRIM, VINYL - DOGFISH, 11129	—	GM sourced
G31	SPECIAL REAR SPRING	—	Provisional
G32	REAR SPRINGS	—	Provisional
G33	REAR SPRING, LEFT SIDE	—	Provisional
G34	REAR SPRING, RIGHT SIDE	—	Provisional
G38	Axle Front 8, 000 Lb., Awd, Front Driving	—	Reference
G3I	GVWR, 11,700 lbs. (5307 kg)	2026	GM sourced
G40	Axle Ratio,4.167:1 this code has more than one documented meaning — filter by year	—	Reference
G42	P, SSR, M, SUSPENSION REAR, 18,000 LB, AIR	1998	GM sourced
G44	P, RAX, M, AXLE REAR, 3.07 RATIO	1984	GM sourced
G45	P, SSR, M, SUSPENSION REAR, 23,000 LB (10,430 KG), AIR, 607	—	GM sourced
G46	P, SSR, M, SUSPENSION REAR, 15,000 LB, AIR	1998	GM sourced
G47	P, SSR, M, SUSPENSION REAR, 11,000 LB, AIR, 11025	—	Provisional
G48	Exterior color Auburn Metallic	2022	GM sourced
G4A	GVW Rating 9, 300 Lbs	—	Reference
G4C	Primary Color Exterior, Royal Solid Blue (244v)	—	Reference
G4H	GVWR, 11,900 lbs. (5398 kg)	2026	GM sourced
G4Y	GVWR, 12,100 lbs. (5488 kg)	2026	GM sourced
G50	P, RSP, M, SPRING REAR, HEAVY DUTY, VAR 1	1998	GM sourced
G51	P, RSP, M, SPRING REAR, HEAVY DUTY, VAR 2	1998	GM sourced
G52	P, SPRING, RR, 15,000 LBS this code has more than one documented meaning — filter by year	1998	GM sourced
G54	P, RSP, M, SPRING REAR, 18,500 LBS this code has more than one documented meaning — filter by year	1998	GM sourced
G56	Primary Color Exterior, Stealth Gray Met	—	Reference
G5O	SPRING REAR, HEAVY DUTY, VAR 1	—	Provisional
G5Q	Primary Color Exterior, Regal Peacock (dark Green) (103x)	—	Reference
G60	P, RSP, M, SPRING REAR, AUX	1997	GM sourced
G61	P, PROVISIONS, WHEEL, FOUR HOLE MOUNTING	1999	Provisional
G62	P, PROVISIONS, WHEEL, FIVE HOLE MOUNTING	1999	Provisional
G63	P, PROVISIONS, LUGGAGE CARRIER, ROOF	1999	GM sourced
G64	Sales Package Performance	—	Reference
G65	P, LEVEL CONTROL, MAN, SELF-ADJUSTING this code has more than one documented meaning — filter by year	1996	GM sourced
G66	P, LEVEL CONTROL, MAN, AIR this code has more than one documented meaning — filter by year	1996	GM sourced
G67	P, LEVEL CONTROL, AUTO, AIR this code has more than one documented meaning — filter by year	1984	GM sourced
G68	P, SHK, R, SHOCK ABSORBERS, RR, HD, TRUCK this code has more than one documented meaning — filter by year	1984	GM sourced
G69	P, LEVEL CONTROL, AUTO, AIR, HD this code has more than one documented meaning — filter by year	1990	GM sourced
G6B	Primary Color Exterior, Secret Lavender(342x)	—	Reference
G6C	Primary Color Exterior, Mars Stone(341x)	—	Reference
G6D	Primary Color Exterior, Dark Burgundy(339x)	—	Reference
G6E	Primary Color Exterior, Solar Red(338x)	—	Reference
G6F	Primary Color Exterior, Fresh Green Lime(340x)	—	Reference
G6H	Primary Color Exterior, Blue Sapphire(343x)	—	Reference
G6J	Primary Color Exterior, Smokey Beige(304v)	—	Reference
G6K	Primary Color Exterior, Some Like IT Hot - Bronze Red(414y)	—	Reference
G6L	Primary Color Exterior, Switch - FX Black (415y)	—	Reference
G6M	Dark Ash Metallic	2026	GM sourced
G6N	Primary Color Exterior, Vapour Mist - Teal(424y)	—	Reference

Using the master list

This is the full GM RPO code list we hold — every Regular Production Option code in the database, searchable by code or by description and filterable to a single model year. Most RPO lists on the internet run to a couple of hundred codes copied from one service manual. This one holds 24,366, and tells you where each meaning came from.

What an RPO code is

RPO stands for Regular Production Option. Every piece of factory equipment on a GM vehicle carries a three-character code, and the ones fitted to your truck are printed on the Service Parts Identification label in the glove box or on the door jamb. G80 is a locking differential, Z71 is an off-road suspension package, K05 is a block heater.

They matter because they are what the factory actually built, not what a listing claims. If you are buying a truck, the label settles the argument. If you are ordering parts, the axle and transmission codes decide which part fits.

Why the same code means different things

GM has reused these codes for decades and across every division. A code that means one thing on a 1978 pickup can mean something unrelated on a 2015 SUV, and plenty of entries in circulation come from bulk listings with no year and no document behind them.

So every entry here is labelled with where it came from. GM sourced means we hold an actual GM document for it. GM dated means it comes from the option master with a date attached. Reference means it is in general circulation with nothing dated behind it — still useful, but treat it as a lead rather than a fact. Filtering by your model year is the single best way to get an answer you can rely on.

Read the codes off your own label

If you have the sticker in front of you, the RPO decoder will read a photo of it and decode every code at once, checked against your model year.

FullSizeChevy.com is not affiliated with, endorsed by, or sponsored by General Motors. Chevrolet, GMC, Cadillac, Silverado, Sierra and related marks are trademarks of General Motors LLC and are used here only to identify applicable vehicles. RPO meanings vary by model year, platform and configuration — verify against your own label before buying parts.