← All owner tools · Decode your own SPID label with the GM RPO decoder
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| 001 | P RAT, M RATIO, 3.70 | 1991 | GM sourced |
| 001 | Rat, M Ratio, 3.70 | 1991 | GM dated |
| 002 | P RAT, M RATIO, 4.11 (4 1/9) | 1991 | GM sourced |
| 002 | Rat, M Ratio, 4.11 (4 1/9) | 1991 | GM dated |
| 003 | Rat, M Ratio, 4.33 | 1991 | GM dated |
| 003 | P RAT, M RATIO, 4.33 | 1991 | GM sourced |
| 004 | Rat, M Ratio, 4.78 | 1994 | GM dated |
| 004 | P RAT, M RATIO, 4.78 | 1994 | GM sourced |
| 005 | Rat, M Ratio, 4.56 (4 5/9) | 1991 | GM dated |
| 005 | P RAT, M RATIO, 4.56 (4 5/9) | 1991 | GM sourced |
| 006 | Rat, M Ratio, 4.63 (4 5/8) | 1996 | GM dated |
| 006 | P RAT, M RATIO, 4.63 (4 5/8) | 1996 | GM sourced |
| 007 | Rat, M Ratio, 3.07 | 1997 | GM dated |
| 007 | P RAT, M RATIO, 3.07 | 1997 | GM sourced |
| 008 | Rat, M Ratio, 4.88 | 1996 | GM dated |
| 008 | P RAT, M RATIO, 4.88 | 1996 | GM sourced |
| 009 | Rat, M Ratio, 5.29 | 1991 | GM dated |
| 009 | P RAT, M RATIO, 5.29 | 1991 | GM sourced |
| 00A | Spare wheel upgrade Chevrolet Silverado 1500 | 2022–2023 | GM sourced |
| 00A | Wheel Spare 17 X 8.0, J, Steel, Design 2 | — | Reference |
| 00D | Not Equipped with Climate Control Knob Digital Temperature Display Chevrolet Silverado 1500 | 2022 | Provisional |
| 00G | Not Equipped with Heated Steering Wheel, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00L | Ccl, R Secondary Color, Exterior, Prime | 1989 | GM dated |
| 00L | P CCL, R SECONDARY COLOR, EXTERIOR, PRIME | 1989 | GM sourced |
| 00L | Exterior Color,secondary,prime,union City Body | — | GM dated |
| 00R | Not Equipped with Heated Rear Outboard Seats, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00U | Ccu, M Primary Color, Exterior, Prime | 1989 | GM dated |
| 00U | P CCU, M PRIMARY COLOR, EXTERIOR, PRIME | 1989 | GM sourced |
| 00U | Exterior Color,primary,prime,upper,union City Body | — | GM dated |
| 00V | Not Equipped with Heated or Ventilated Front Seats, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00Y | Not Equipped with Rear Park Assist, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00Z | Not Equipped with Front and Rear Park Assist, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 010 | Rat, M Ratio, 5.43 | 1991 | GM dated |
| 010 | P RAT, M RATIO, 5.43 | 1991 | GM sourced |
| 011 | Rat, M Ratio, 5.57 (5 4/7) | 1991 | GM dated |
| 011 | P RAT, M RATIO, 5.57 (5 4/7) | 1991 | GM sourced |
| 012 | Rat, M Ratio, 5.83 | 1991 | GM dated |
| 012 | P RAT, M RATIO, 5.83 | 1991 | GM sourced |
| 013 | Rat, M Ratio, 3.73 | 1995 | GM dated |
| 013 | P RAT, M RATIO, 3.73 | 1995 | GM sourced |
| 014 | Rat, M Ratio, 6.14 (6 1/7) | 1991 | GM dated |
| 014 | P RAT, M RATIO, 6.14 (6 1/7) | 1991 | GM sourced |
| 015 | Rat, M Ratio, 6.17 | 1991 | GM dated |
| 015 | P RAT, M RATIO, 6.17 | 1991 | GM sourced |
| 016 | Rat, M Ratio, 5.25 | 1991 | GM dated |
| 016 | P RAT, M RATIO, 5.25 | 1991 | GM sourced |
| 017 | Rat, M Ratio, 6.50 | 1991 | GM dated |
| 017 | P RAT, M RATIO, 6.50 | 1991 | GM sourced |
| 018 | Rat, M Ratio, 6.65 | 1989 | GM dated |
| 018 | P RAT, M RATIO, 6.65 | 1989 | GM sourced |
| 019 | Rat, M Ratio, 6.67 | 1989 | GM dated |
| 019 | P RAT, M RATIO, 6.67 | 1989 | GM sourced |
| 01A | Stc, R Stripe Color, Accent, Two Tone, Silver/gunmetal (1995) | 1998 | GM dated |
| 01A | P STC, R STRIPE COLOR, ACCENT, TWO TONE, SILVER/GUNMETAL (1995) | 1998 | GM sourced |
| 01A | Stripe Color Accent, Two Tone, Silver/gunmetal | — | GM dated |
| 01A | Trim Color Seat Jet Black | — | GM dated |
| 01B | Trim Color Seat LT Neutral | — | Reference |
| 01C | Trim Color Seat LT Titanium | — | Reference |
| 01D | Trim Color Seat LT Cashmere | — | Reference |
| 01E | Trim Color Seat DK Titanium | — | Reference |
The full list, A to Z
Showing 701–741 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 |
|---|---|---|---|
| GXW | Primary Color Exterior, Glacier White Met (731t) | — | Reference |
| GXX | Primary Color Exterior, Infinito Blue Met (729t) | — | Reference |
| GXY | Primary Color Exterior, Yare Red Sol (726t) | — | Reference |
| GXZ | Primary Color Exterior, Celestial Silver Met (727t) | — | Reference |
| GY1 | Ratio, Transaxle Final Drive 3.85 | — | Reference |
| GY2 | P, RAX, M, AXLE REAR, 4.30 RATIO | 1984 | GM sourced |
| GY3 | P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 4.29 (USE OPTION FV7) | 1997 | GM sourced |
| GY4 | P, RAX, M, AXLE REAR, 4.53 RATIO | 1983 | GM sourced |
| GY5 | P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 3.75, 20521 | — | GM sourced |
| GY6 | Ratio Transaxle Final Drive 3.76 | — | Reference |
| GY7 | P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 4.18 (USE OPTION FV2) | 1997 | GM sourced |
| GY9 | P, RAX, M, AXLE REAR, 4.31 RATIO | 1995 | Provisional |
| GYH | P, RSP, M, SPRING REAR, AUX, 4,000 LBS CAPACITY, MULTILEAF this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GYJ | Part Package,van | — | Reference |
| GYK | Primary Color Exterior, Mystic Moonlight Blue Metallic (207v) | — | Reference |
| GYL | Primary Color Exterior, Sandy Beach Brown Metallic (206v) | — | Reference |
| GYM | Primary Color Exterior, Satin Steel Grey Metallic (205v) | — | Reference |
| GYN | Primary Color Exterior, Snowflake White Pearl (203v) this code has more than one documented meaning — filter by year | — | Reference |
| GYO | Primary Color Exterior, Deep Espresso Brown Metallic (204v) | — | Reference |
| GYS | RATIO TRANSAXLE FINAL DRIVE 3.65 | — | Provisional |
| GYV | P, RSP, M, SPRING REAR, RECREATIONAL VEHICLE UPFITTER this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| GZ3 | P, FUEL TANK FILLER, NECK, UNRESTRICTED, 829 E, 0 | — | GM sourced |
| GZ7 | Primary Color Exterior, Prussian Steel Mid Green Grey (102x) | — | Reference |
| GZD | Primary Color Exterior, Maranello Red (489p) | — | Reference |
| GZE | Primary Color Exterior, Athenian White (492p) | — | Reference |
| GZF | Primary Color Exterior, Lancelot Gold (735q) | — | Reference |
| GZG | P, GVW, M, GVW RATING, 19,500 LBS, 612 | — | GM sourced |
| GZH | C, SSR, M, SUSPENSION REAR, 12,000 LB, TAPERED LEAF this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZI | P, GVW, M, GVW RATING, 25,950 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZJ | P, GVW, M, GVW RATING, 18,000 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZK | Suspension Rear Hend Rt400, 40000 Lbs., Rub Bush, 52 Inch Beam, W/trans Torque Rods | — | Reference |
| GZL | C, GVW, M, GVW RATING, 19,800 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZM | C, GVW, M, GVW RATING, 16,950 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZN | C, SSR, M, SUSPENSION REAR, 46,000 LB, HENDRICKSON RTE460, 54 IN BEAM,, W/BRONZE BUSHINGS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZP | C, SSR, M, SUSPENSION REAR, 34,000 LB, HENDRICKSON RT2-340, W/RUBBER BUSHINGS | 1998 | GM sourced |
| GZT | P, PROVISIONS, TAPERED LEAF/MULTILEAF RR SPRINGS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZU | P, GVW, M, GVW RATING, 15,500 LBS | 1998 | GM sourced |
| GZV | GVW Rating 6,411 Lbs / 2,908 KG | — | Reference |
| GZW | P, GVW, M, GVW RATING, 17,000 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZX | P, GVW, M, GVW RATING, 17,500 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| GZZ | P, CONTROL, VARIABLE HEIGHT, 20225 | — | GM sourced |
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.