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

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The full list, A to Z

Showing 401–500 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
GK7	P, RAX, M, AXLE REAR, 4.78 RATIO, 2,750 KG, SINGLE SPEED	1998	Provisional
GK8	P, RAX, M, AXLE REAR, 4.33 RATIO, 16,500 KG, SINGLE SPEED	1998	Provisional
GK9	P, RAX, M, AXLE REAR, 4.63 RATIO this code has more than one documented meaning — filter by year	1988	GM sourced
GKB	Primary Color Sand Drift Grey	—	Reference
GKC	Primary Color Merlot Jewel Met	—	Reference
GKD	Primary Color Kandinsky Red Mica	—	Reference
GKE	Primary Color Linen Beige Met	—	Reference
GKF	Primary Color Oak Green Mica	—	Reference
GKG	Primary Color Zest Brown Met	—	Reference
GKH	Primary Color Poseidon Blue Mica	—	Reference
GKI	Primary Color Dark Denim Grey Mica	—	Reference
GKP	Primary Color Exterior, Mary Kay Pearl Tri-coat V (10)	—	Reference
GKZ	Primary Color Exterior, Torch Red (g)	—	Reference
GL0	P, RAX, M, AXLE REAR, 5.13 RATIO this code has more than one documented meaning — filter by year	1994	GM sourced
GL1	P, RAX, M, AXLE REAR, 7,900 LB CAPACITY this code has more than one documented meaning — filter by year	1998	GM sourced
GL2	P, RAX, M, AXLE REAR, 10,000 LB CAPACITY this code has more than one documented meaning — filter by year	1998	GM sourced
GL3	P, RAX, M, AXLE REAR, 6.17 RATIO this code has more than one documented meaning — filter by year	1988	GM sourced
GL4	P, RAX, M, AXLE REAR, 11,000 LB (4,990 KG), 607	—	GM sourced
GL5	P, FIN, R, FLEET INCENTIVE, CHAMBERS RENT A CAR (H/J/M/N/U/W-TRK CKGST), 10119	—	Provisional
GL6	P, RAX, M, AXLE REAR, 12,000 LB CAPACITY this code has more than one documented meaning — filter by year	1998	GM sourced
GL7	P, RAX, M, AXLE REAR, 5,500 KG, MERITOR, SINGLE SPEED, 5.86:1	1999	Provisional
GL8	P, RAX, M, AXLE REAR, 13,500 LB (6,124 KG), 607	—	GM sourced
GL9	P, RAX, M, AXLE REAR, 15,000 LB CAPACITY	1998	GM sourced
GLB	Primary Color Exterior, Sonic Blue Metallic 818t	—	Reference
GLC	Primary Color Exterior,urban Fresh Tricoat 814t	—	Reference
GLF	Primary Color Exterior, Carlisle Blue Metallic this code has more than one documented meaning — filter by year	—	Reference
GLG	Primary Color Exterior, Flex Orange Metallic 820t	—	Reference
GLH	Primary Color Exterior, Kevlava Gray Met (417p)	—	Reference
GLJ	Primary Color Exterior, Ashen Gray Metallic 810t	—	Reference
GLK	Primary Color Exterior, Black Diamond Tricoat 815t	—	Reference
GLP	Primary Color Exterior, Espresso Brown 805t	—	Reference
GLR	Black Cherry Metallic exterior paint color	2020	GM sourced
GLT	Glacier Blue Metallic	2023	GM sourced
GLU	Lakeshore Blue Metallic	2026	GM sourced
GLX	Primary Color Exterior, Transition Quartz Metallic 817t	—	Reference
GLY	Primary Color Exterior, Veridian Bronze Metallic 808t	—	Reference
GLZ	Primary Color Exterior, Magic Red (g)	—	Reference
GM0	P, RAX, M, AXLE REAR, 3.58 RATIO	1999	Provisional
GM1	P, RAX, M, AXLE REAR, 2.59 RATIO	1984	GM sourced
GM2	P, RAX, M, AXLE REAR, 3.44 RATIO	1983	GM sourced
GM3	P, RAX, M, AXLE REAR, 3.45 RATIO this code has more than one documented meaning — filter by year	1983	GM sourced
GM4	P, RAX, M, AXLE REAR, 3.67 RATIO	1983	GM sourced
GM5	P, RAX, M, AXLE REAR, 3.89 RATIO	1983	GM sourced
GM6	P, RAX, M, AXLE REAR, 4.22 RATIO	1983	GM sourced
GM7	P, RAX, M, AXLE REAR, 3.68 RATIO	1996	GM sourced
GM8	P, RAX, M, AXLE REAR, 2.56 RATIO this code has more than one documented meaning — filter by year	1983	GM sourced
GM9	P, RAX, M, AXLE REAR, 3.63 RATIO, 10521	—	Provisional
GMB	P, PLT, R, PLANT CODE, GM DO BRASIL LTDA, BRAZIL	1997	Provisional
GMC	P, PLT, R, PLANT CODE, PONTIAC, MI, USA this code has more than one documented meaning — filter by year	1997	GM sourced
GME	Ornamentation Extr 'gm' Mark OF Excellence	—	Reference
GMH	Primary Color Exterior, Hydro Blue Metallic (640r)	—	Reference
GMJ	Primary Color Exterior, Spinel Red	—	Reference
GMK	Primary Color Exterior, Intense Black (g) 8555	—	Reference
GMM	Primary Color Exterior, Fiery Red (g)	—	Reference
GMN	Primary Color Exterior, Desert Bloom	—	Reference
GMP	P, FLEET PROGRAM, BID ASSISTANCE, PSA (-TRK CKGMPST)	1998	GM sourced
GMQ	Radio Am/fm Stereo, SD Nav, Dvd-rom, Caf, Usb, Rsa, Voice Rec, Aux JA	—	Reference
GMT	P, FLEET PROGRAM, BID ASSISTANCE, PURA (-TRK CKGMPST)	1998	GM sourced
GMU	Pepperdust Metallic exterior paint color (discontinued for 2020)	2020	GM sourced
GMY	P, PLT, R, PLANT CODE, TURIN, ITALY	1997	Provisional
GMZ	P, PLT, R, PLANT CODE, ZARAGOZA, SPAIN	1997	GM sourced
GN0	P, SSR, M, SUSPENSION REAR, 19,000 LB (8,620 KG), MULTILEAF, 612	—	GM sourced
GN1	Stabilizer Bar,rear	—	Reference
GN2	P, SSR, M, SUSPENSION REAR, 19,000 LB (8,620 KG), TAPERED LEAF, 607	—	GM sourced
GN3	P, SSR, M, SUSPENSION REAR, 17,000 LB, (7711 KG), MULTILEAF, 10510	—	GM sourced
GN4	P, SSR, M, SUSPENSION REAR, 5,300 LB, LOW POSITION this code has more than one documented meaning — filter by year	1998	GM sourced
GN5	P, SSR, M, SUSPENSION REAR, 6,200 LB this code has more than one documented meaning — filter by year	1998	GM sourced
GN6	P, SSR, M, SUSPENSION REAR, 7,500 LB this code has more than one documented meaning — filter by year	1998	GM sourced
GN7	P, SSR, M, SUSPENSION REAR, 8,000 LB this code has more than one documented meaning — filter by year	1998	GM sourced
GN8	Spring,rear 9525kg(21000 Lb)multileaf	—	Reference
GN9	P, RAX, M, AXLE REAR, 4.11 RATIO this code has more than one documented meaning — filter by year	1983	GM sourced
GNA	Chassis Equip Front Strut Asm	—	Reference
GNB	Chassis Equip Front Strut Asm, Performance	—	Reference
GNC	Chassis Equip Rear Rear Axle, 4-link	—	Reference
GND	P, SALES PACKAGE, AVALANCHE GROUND AFFECTS, 20311	—	GM sourced
GNE	Chassis Equip Rear Rear Axle, H-arm	—	Reference
GNF	Chassis Equip Rear Rear Axle, Compound Crank	—	Reference
GNG	Chassis Equip Rear Rear Axle, Compound Crank, Additional Watt Linkage	—	Reference
GNJ	Primary Color Exterior, Artemis Grey (8981)	—	Reference
GNK	Oxford Brown Metallic, new for 2021	2021	GM sourced
GNN	Suspension-rr, Hendrickson (ru, Rue, U, Ue, Rt, Rte)	—	Reference
GNR	Suspension,rear,hendrickson Rt380(38000#),rubber Bushings,52 IN Beams	—	Reference
GNS	P, SSR, M, SUSPENSION REAR, 40,000 LB (18,144 KG), HEND RT400, 52 IN BEAM, W/RUBBER BUSHINGS, 607	—	GM sourced
GNT	C, SSR, M, SUSPENSION REAR, 40,000 LB, HENDRICKSON RTE400, 52 IN BEAM,, W/RUBBER BUSHINGS this code has more than one documented meaning — filter by year	1998	GM sourced
GNU	Primary Color Exterior, Ivory Gold	—	Reference
GNV	Primary Color Exterior, Celestial Blue (725u)	—	Reference
GNW	Primary Color Exterior, Dazzling Silver	—	Reference
GNZ	Chassis Equipment Gmc, Off Road	—	Reference
GO9	P, MSM, R, MODEL CONVERSION, BERTONE EDITION, 830 E, 0	—	Provisional
GOB	Primary Color Exterior, Cherry Red Met (g) 715j	—	Reference
GOC	Primary Color Exterior, Highway Yellow (g) 104k	—	Reference
GOK	Primary Color Exterior, Silky Shadow, Met (g)	—	Reference
GOL	Primary Color Exterior, Fresko, Met (g)	—	Reference
GON	Primary Color Exterior, Avalon, Met (g)	—	Reference
GOP	Primary Color Exterior, DK Mahagony, Mica (g)	—	Reference
GOR	Fleet Incentive Synagro, Inc (trk Ckst)	—	Reference
GOS	Family Code, Opt Group Selection	1993	GM dated
GOT	Family Code, Window Tinted	1989	GM dated
GOW	Primary Color Exterior, Olympic White & Black II	—	Reference
GOX	Primary Color Exterior, Topaz Met	—	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.